M TC77 ™ Thermal Sensor with SPI Interface Features Description • Digital Temperature Sensing in 5-Pin SOT-23A The TC77 is a serially accessible digital temperature and 8-Pin SOIC Packages sensor particularly suited for low cost and small form- • Outputs Temperature as a 13-Bit Digital Word factor applications. Temperature data is converted from the internal thermal sensing element and made avail- • SPI and MICROWIRE™ Compatible Interface able at anytime as a 13-bit two’s compliment digital • Solid State Temperature Sensing word. Communication with the TC77 is accomplished • ±1°C (max.) accuracy from +25°C to +65°C via a SPI and MICROWIRE compatible interface. It has • ±2°C (max.) accuracy from -40°C to +85°C a 12-bit plus sign temperature resolution of 0.0625°C • ±3°C (max.) accuracy from -55°C to +125°C per Least Significant Bit (LSb). The TC77 offers a tem- • 2.7V to 5.5V Operating Range perature accuracy of ±1.0°C (max.) over the tempera- ture range of +25°C to +65°C. When operating, the • Low Power TC77 consumes only 250µA (typ.). The TC77’s Con- - 250µA (typ.) Continuous Conversion Mode figuration register can be used to activate the low - 0.1µA (typ.) Shutdown Mode power Shutdown mode, which has a current consump- tion of only 0.1µA (typ.). Small size, low cost and ease Typical Applications of use make the TC77 an ideal choice for implementing thermal management in a variety of systems. • Thermal Protection for Hard Disk Drives and Other PC Peripherals Package Types • PC Card Devices for Notebook Computers • Low Cost Thermostat Controls SOT-23-5 SOIC • Industrial Control CS 1 VDD SI/O 1 VDD • Office Equipment SCK CS • Cellular Phones VSS TC77 TC77 NC NC • Thermistor Replacement SCK SI/O VSS NC Block Diagram Typical Application V DD V DD Internal TC77 Diode 0.1µF Temperature Sensor V DD PICmicro® TC77 Manufacturer MCU ID Register 13-Bit Sigma Delta A/D Converter CS AN0 CS Serial Port SI/O SCK SCK Interface Temperature SCK Register SI/O SDI V SS V Configuration SS Register  2002 Microchip Technology Inc. DS20092A-page 1

TC77 1.0 ELECTRICAL PIN FUNCTION TABLE CHARACTERISTICS Name Function 1.1 Absolute Maximum Ratings † SI/O Serial Data Pin V ........................................................................6.0V SCK Serial Clock DD V Ground All inputs and outputs w.r.t. V .....-0.3V to V +0.3V SS SS DD CS Chip Select (Active-Low) Storage temperature..........................-65°C to +150°C NC No Connection Ambient temp. with power applied.....-55°C to +125°C V Power Supply DD Junction Temperature.........................................150°C ESD protection on all pins: Human Body Model (HBM)..............................>4kV Machine Model (MM)......................................>200V † Notice: Stresses above those listed under "Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operation listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. DC CHARACTERISTICS Electrical Specifications: Unless otherwise noted, all parameters apply at V = 2.7V to 5.5V and DD T = -55°C to +125°C. A Parameters Sym Min Typ Max Units Conditions Power Supply Operating Voltage Range V 2.7 — 5.5 V Note1 DD Operating Current I — 250 400 µA Continuous Temperature DD Conversion Mode Power-On Reset Threshold V 1.2 1.6 2.2 V V falling or rising edge POR DD Standby Supply Current I — 0.1 1.0 µA Shutdown Mode DD- STANDBY Temperature to Bits Converter Resolution — 13 — Bits ADC LSb = 0.0625°C/bit (Note4) Temperature Conversion Time t — 300 400 ms CT Temperature Accuracy T -1.0 — +1.0 °C +25°C < T < +65°C ERR A (Note1) -2.0 — +2.0 -40°C < T < +85°C A -3.0 — +3.0 -55°C < T < +125°C A TC77-3.3MXX: V = 3.3V DD TC77-5.0MXX: V = 5.0V DD Note 1: The TC77-3.3MXX and TC77-5.0MXX will operate from a supply voltage of 2.7V to 5.5V. However, the tem- perature accuracy of the TC77-3.3MXX and TC77-5.0MXX is specified at the nominal operating voltages of 3.3V and 5.0V, respectively. As V varies from the nominal operating value, the accuracy may be DD degraded (Refer to Figures2-6 and 2-7). 2: All time measurements are measured with respect to the 50% point of the signal. 3: Load Capacitance, C = 80 pF, is used for AC timing measurements of output signals. L 4: Resolution = Temperature Range/No. of Bits = (+255°C – -256°C) / (213) Resolution = 512/8192 = 0.0625°C/Bit DS20092A-page 2  2002 Microchip Technology Inc.

TC77 DC CHARACTERISTICS (CONTINUED) Electrical Specifications: Unless otherwise noted, all parameters apply at V = 2.7V to 5.5V and DD T = -55°C to +125°C. A Parameters Sym Min Typ Max Units Conditions Digital Input/Output High Level Input Voltage V 0.7 V — V + 0.3 V IH DD DD Low Level Input Voltage V -0.3 — 0.3 V V IL DD High Level Output Voltage V 2.4 — — V I = -400µA OH OH Low Level Output Voltage V — — 0.4 V I = +2mA OL OL Input Current I -1.0 — +1.0 µA V = GND IN(0), IN I -1.0 — +1.0 V = V IN(1) IN DD Input Hysteresis 0.35 0.8 — V SI/O, SCK Pin Capacitance C , C — 20 — pF IN OUT Tri-state Output Leakage I -1.0 — — µA V = GND O_LEAK O Current — — +1.0 V = V O DD Serial Port AC Timing (Notes2,3) Clock Frequency f DC — 7.0 MHz CLK CS Fall to First Rising SCK t 100 — — ns CS-SCK Edge CS Low to Data Out Delay t — — 70 ns CS-SI/O SCK Fall to Data Out Delay t — — 100 ns DO CS High to Data Out t — — 200 ns DIS Tri-state SCK High to Data In Hold Time t 50 — — ns HD Data In Set-up Time t 30 — — ns SU Thermal Package Resistance Thermal Resistance, SOT23-5 θ — 230 — °C/W JA Thermal Resistance, 8L-SOIC θ — 163 — °C/W JA Note 1: The TC77-3.3MXX and TC77-5.0MXX will operate from a supply voltage of 2.7V to 5.5V. However, the tem- perature accuracy of the TC77-3.3MXX and TC77-5.0MXX is specified at the nominal operating voltages of 3.3V and 5.0V, respectively. As V varies from the nominal operating value, the accuracy may be DD degraded (Refer to Figures2-6 and 2-7). 2: All time measurements are measured with respect to the 50% point of the signal. 3: Load Capacitance, C = 80 pF, is used for AC timing measurements of output signals. L 4: Resolution = Temperature Range/No. of Bits = (+255°C – -256°C) / (213) Resolution = 512/8192 = 0.0625°C/Bit  2002 Microchip Technology Inc. DS20092A-page 3

TC77 Data Output Timing CS t CS-SCK 1/f CLK SCK tCS-SI/O tDO tDIS HI-Z HI-Z SI/O MSb LSb SI/O Data Input Set-up and Hold Timing (Data is clocked on the rising edge of SCK) CS CS SCK SCK tHD tSU tHD tSU HI-Z HI-Z SI/O SI/O FIGURE 1-1: Timing Diagrams. DS20092A-page 4  2002 Microchip Technology Inc.

TC77 2.0 TYPICAL PERFORMANCE CURVES Note: The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range. Note: Unless otherwise indicated, all parameters apply at V = 3.3V for the TC77-3.3MXX and V = 5.0V for the TC77- DD DD 5.0MXX, and T = -55°C to +125°C. The TC77-3.3MXX and TC77-5.0MXX will operate from a supply voltage of 2.7V A to 5.5V. However, the temperature accuracy of the TC77-3.3MXX and TC77-5.0MXX is specified at the nominal oper- ating voltages of 3.3V and 5.0V, respectively. 3.5 3 Upper Specification Limit 0.3 e Error (°C) 012...012555 Mean + 3(cid:86) Mean urrent (µA) 0.2 TC77-5.0MXX Temperatur ---210---...321555 Lower Specificatio n LimMitean - 3(cid:86) Shutdown C 0.1 TVCDD7 7=- 33..33 MVXX VDD = 5.0 V -3.5 0.0 -55 -35 -15 5 25 45 65 85 105 125 -55 -25 5 35 65 95 125 Reference Temperature (°C) Temperature (°C) FIGURE 2-1: Accuracy vs. Temperature FIGURE 2-4: Shutdown Current vs. (TC77-XXMXX). Temperature. 250 V) 2.5 urrent (µA) 223400 TA = +25°C set Voltage ( 12..50 C e pply 220 TA = -55°C On R 1.0 Su 210 er- 0.5 w 200 TA = +125°C Po 0.0 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 -55 -25 5 35 65 95 125 Temperature (°C) Supply Voltage (V) FIGURE 2-2: Supply Current vs. Supply FIGURE 2-5: Power-On Reset Voltage vs. Voltage (TC77-XXMXX). Temperature (TC77-XXMXX). 0.4 ent (µA) 233450500000 TVCDD7 7=- 55..00M VXX Change (°C) 000...123 TTAC =7 +7-835.°3CMXXTA = +25°C Curr 200 TC77-3.3MXX ure 0 pply 110500 VDD = 3.3 V perat --00..21 TA = -25°C u m S 50 e -0.3 T 0 -0.4 -55 -25 5 35 65 95 125 3 3.1 3.2 3.3 3.4 3.5 3.6 Temperature (°C) Supply Voltage (V) FIGURE 2-3: Supply Current vs. FIGURE 2-6: Temperature Accuracy vs. Temperature. Supply Voltage (TC77-3.3MXX).  2002 Microchip Technology Inc. DS20092A-page 5

TC77 mperature Change (°C) --000000......1234210 (cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)TT(cid:1)(cid:1)AC(cid:1)(cid:1) (cid:1)=7(cid:1)(cid:1) 7(cid:1)+(cid:1)-(cid:1)85(cid:1)(cid:1)5.(cid:1)0(cid:1)°(cid:1)CM(cid:1)(cid:1)(cid:1)X(cid:1)(cid:1)X(cid:1)(cid:1)T(cid:1)(cid:1)A(cid:1)(cid:1) (cid:1)=(cid:1)(cid:1) (cid:1)+(cid:1)(cid:1)2(cid:1)(cid:1)5(cid:1)T(cid:1)°(cid:1)AC(cid:1) (cid:1)=(cid:1)(cid:1) (cid:1)-(cid:1)(cid:1)2(cid:1)(cid:1)5(cid:1)°(cid:1)(cid:1)C(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1) entage of Occurances (%) 112233445050505050 STAa m= p+l2e5 S°Cize = 108 Te -0.3 (cid:1) (cid:1) erc 5 P -0.4 (cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1) 0 4.5 4.6 4.7 4.8 4.9 5 5.1 5.2 5.3 5.4 5.5 -1 -0.75 -0.5 -0.25 0 0.25 0.5 0.75 1 Supply Voltage (V) Temperature Error (°C) FIGURE 2-7: Temperature Accuracy vs. FIGURE 2-10: Histogram of Temperature Supply Voltage (TC77-5.0MXX). Accuracy at +25 Degrees C (TC77-XXMXX). 35 50 %) Sample Size = 108 %) 45 Sample Size = 108 Occurances ( 223050 TA = -55°C Occurances ( 23345050 TA = +65°C Percentage of 110505 Percentage of 11205005 -3 -2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5 3 -1 -0.75 -0.5 -0.25 0 0.25 0.5 0.75 1 Temperature Error (°C) Temperature Error (°C) FIGURE 2-8: Histogram of Temperature FIGURE 2-11: Histogram of Temperature Accuracy at -55 Degrees C (TC77-XXMXX). Accuracy at +65 Degrees C (TC77-XXMXX). 40 90 Occurances (%) 22330505 STAa m= p-4le0 °SCize = 108 Occurances (%) 56780000 STAa m= p+l8e5 S°Cize = 108 Percentage of 11055 Percentage of 12340000 0 0 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 Temperature Error (°C) Temperature Error (°C) FIGURE 2-9: Histogram of Temperature FIGURE 2-12: Histogram of Temperature Accuracy at -40 Degrees C (TC77-XXMXX). Accuracy at +85 Degrees C (TC77-XXMXX). DS20092A-page 6  2002 Microchip Technology Inc.

TC77 60 %) Sample Size = 108 s ( 50 TA = +125°C e c n a 40 ur c Oc 30 of e 20 g a nt e 10 c er P 0 -3 -2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5 3 Temperature Error (°C) FIGURE 2-13: Histogram of Temperature Accuracy at +125 Degrees C (TC77-XXMXX).  2002 Microchip Technology Inc. DS20092A-page 7

TC77 3.0 FUNCTIONAL DESCRIPTION The TC77 consists of a band-gap type temperature sensor, a 12-bit plus sign (13-bit) Sigma-Delta Analog- to-Digital Converter (ADC), an internal conversion oscillator (~30kHz) and a serial input/output port. These devices feature a three-wire serial interface that is fully compatible with SPI and MICROWIRE specifica- tions and, therefore, allows simple communications with common microcontrollers and processors. The Shutdown mode can be used to reduce supply current for power sensitive applications. A Manufacturer’s ID register identifies the TC77 as a Microchip Technology product. Output Code 0+0111 1101 0000 +25°C +0.0625°C 0+0001 1001 0000 0+0000 0000 0001 Temp 0+0000 0000 0000 0°C Temp 1+1111 1111 1111 -55°C +125°C 1+1110 0111 0000 -0.0625°C -25°C 1+1100 1001 0000 FIGURE 3-1: Temperature To Digital Transfer Function (Non-linear Scale). DS20092A-page 8  2002 Microchip Technology Inc.

TC77 3.1 Temperature Data Format 3.3 Serial Bus Interface A 13-bit two’s complement digital word is used to rep- The serial interface consists of the Chip Select (CS), resent the temperature. The Least Significant Bit (LSb) Serial Clock (SCK) and Serial Data (SI/O) signals. The is equal to 0.0625°C. Note that the last two LSb bits (Bit TC77 meets the SPI and MICROWIRE bus specifica- 0 and 1) are tri-stated and are represented as a logic ‘1’ tions, with the serial interface designed to be compati- in the table. Bit 2 is set to logic ‘1’ after the completion ble with the Microchip PICmicro® family of of the first temperature conversion following a power- microcontrollers. up or voltage reset event. The CS input is used to select the TC77 when multiple devices are connected to the serial clock and data TABLE 3-1: TC77 OUTPUT lines. The CS line is also used to synchronize the data, Binary which is written to, or read from, the device when CS is Temperature Hex MSB / LSB equal to a logic ‘0’ voltage. The SCK input is disabled when CS is a logic ‘1’. The falling edge of the CS line +125°C 0011 1110 1000 0111 3E 87h initiates communication, while the rising edge of CS +25°C 0000 1100 1000 0111 0B 87h completes the communication. +0.0625°C 0000 0000 0000 1111 00 0Fh The SCK input is provided by the external microcontrol- 0°C 0000 0000 0000 0111 00 07h ler and is used to synchronize the data on the SI/O line. The Temperature and Manufacturer ID registers are -0.0625°C 1111 1111 1111 1111 FF FFh read only while the Configuration register is a read/ -25°C 1111 0011 1000 0111 F3 87h write register. -55°C 1110 0100 1000 0111 E4 87h Figure3-2 provides a timing diagram of a read opera- An over-temperature condition can be determined by tion of the Temperature register. Communication with reading only the first few Most Significant Bits (MSb) of the TC77 is initiated when the CS goes to a logic ‘0’. the temperature data. For example, the microproces- The Serial I/O signal (SI/O) then transmits the first bit of sor could read only the first four bits of the Temperature data. The microcontroller serial I/O bus master clocks register in order to determine that an over-temperature the data in on the rising edge of SCK. The falling edge condition exists. of SCK is then used to clock out the rest of the data. After 14 bits of data (thirteen temperature bits and Bit 2) 3.2 Power-Up And Power-Down have been transmitted, the SI/O line is then tri-stated. The TC77 is in the Continuous Temperature Conver- Note that CS can be taken to a logic ‘1’ at any time dur- sion mode at power-up. The first valid temperature con- ing the data transmission if only a portion of the temper- version will be available approximately 300ms (refer to ature data information is required. The TC77 will “Temperature to Bits Converter” section listed in the DC complete the conversion, and the output shift register characteristics table) after power-up. Bit 2 of the Tem- will be updated, if CS goes to the inactive state while in perature register is set to a logic ‘1’ after the completion the middle of a conversion. of the first temperature conversion following a power- Figure3-3 provides a timing diagram of a multi-byte up or voltage reset event. Bit 2 is set to logic ‘0’ during communication operation consisting of a read of the the time needed to complete the first temperature con- Temperature Data register, followed by a write to the version. Thus, the status of bit 2 can be monitored to Configuration register. The first 16 SCK pulses are indicate the completion of the first temperature conver- used to transmit the TC77's temperature data to the sion. microcontroller. The second group of 16 SCK pulses A supply voltage lower than 1.6V (typ.) is considered a are used to receive the microcontroller command to power-down state for the TC77. The device will reset place the TC77 either in Shutdown or Continuous Tem- itself and continue its normal Continuous Conversion perature Conversion mode. Note that the TC77 is in the mode of operation when the supply voltage rises above Continuous Temperature Conversion mode at power- the nominal 1.6V. A minimal supply voltage of 2.7V is up. required in order to ensure proper operation of the The data written to the TC77’s Configuration register device. should be either all 0’s or all 1’s, corresponding to either the Continuous Temperature Conversion or Shutdown mode, respectively. The TC77 is in Shut- down mode when Bits C0 to C7 are all equal to 1’s. The TC77 will be in the Continuous Conversion mode if a ‘0’ in any bit location from C0 to C7 is written to the Configuration register.  2002 Microchip Technology Inc. DS20092A-page 9

TC77 CS t CS-SCK (cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1) CLK (cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1) (cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1) 1 8 13 HI-Z T T T T T T T T T T T T T HI-Z SI/O 12 11 10 9 8 7 6 5 4 3 2 1 0 FIGURE 3-2: Temperature Read Timing Diagram - (Reading only the first 13 Bits of the Temperature Register). CS t CS-SCK CLK (cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1) (cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1) (cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1) (cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1) 1 8 1 8 1 8 1 8 SI/O HI-Z T T T T T T T T T T T T T BIT HI-Z C C C C C C C C C C C C C C C C HI-Z 12 11 10 9 8 7 6 5 4 3 2 1 0 2 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 TEMPERATURE REGISTER CONFIGURATION REGISTER Notes: Notes: 1. Bit 2 = 0 during power-up for the first 1. XX00 = Continuous Conversion Mode temperature conversion. 2. XXFF = Shutdown Mode 2. Bit 2 =1 after the completion of the first tem- perature conversion following power-up or a reset event. 3. Bits 1 and 0 are “DON”T CARES”. FIGURE 3-3: Temperature Read Followed By A Write To The Configuration Register Timing. Diagram. It is recommended that the user write all ‘0’s or all ‘1’s The following communication steps can be used to to the Configuration register. While the following codes obtain the Manufacturer's ID and put the device into the can be transmitted to the TC77, any other code may Continuous Conversion mode. The Manufacturer’s ID put the TC77 into a test mode reserved by Microchip for register is only accessible for a read operation, if the calibration and production verification tests. TC77 is in Shutdown mode. • 00 hex 1. CS goes low to initiate the communication cycle. • 01 hex 2. Read 16 bits of temperature data from the • 03 hex Temperature register. • 07 hex 3. Write 16 bits of data (i.e. XXFF hex) to the Con- figuration register to enter Shutdown mode. • 0F hex 4. Read the 16 bits from the Manufacturer's ID reg- • 1F hex ister (C15:C8 = 54 hex) to verify that the sensor • 3F hex is a Microchip device. • 7F hex 5. Write 8 to 16 bits of data (00 or 0000 hex) to • FF hex enter Continuous Conversion Mode. 6. Return CS high to terminate the communication cycle. The time between a complete temperature conversion and data transmission is approximately 300msec. DS20092A-page 10  2002 Microchip Technology Inc.

TC77 4.0 INTERNAL REGISTER STRUCTURE The TC77 Internal register structure consists of three registers. The Temperature and Manufacturer’s Identi- fication registers are read only, while the Configuration register is write only. TABLE 4-1: REGISTERS FOR TC77 Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Name Value at Powerup/Reset 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 CONFIG C15 C14 C13 C12 C11 C10 C9 C8 C7 C6 C5 C4 C3 C2 C1 C0 XXXX/XXXX 0000/0000 TEMP T12 T11 T10 T9 T8 T7 T6 T5 T4 T3 T2 T1 T0 * x x 1111/1111 0000/0*XX M_ID 0 1 0 1 0 1 0 0 0 0 0 0 0 0 x x 0101/0100 0000/00XX * Bit 2 = 0 during power-up; otherwise, bit 2 =1 4.1 Configuration Register (CONFIG) 4.2 Temperature Register (TEMP) The Configuration register is write only. This register The Temperature register is read only and holds the selects either Shutdown, Continuous Conversion or temperature conversion data. Bits 0 and 1 are unde- Test modes: fined and will be tri-state outputs during a read sequence. Bit 2 is set to a logic ‘1’ after completion of • C15:C0 = XXXX/XXXX 1111/1111 (Shutdown the first temperature conversion following a power-up mode) or reset event. Bit 2 is set to a logic ‘0’ during the time • C15:C0 = XXXX/XXXX 0000/0000 (Continuous needed to complete the first temperature conversion. Conversion mode) Therefore, the status of bit 2 can be monitored to indi- • The TC77 is in Shutdown mode when bits C0 to cate that the TC77 has completed the first temperature C7 are all equal to ‘1’s. The TC77 will be in the conversion. Bits 15:3 contain the 13 bit two’s comple- Continuous Conversion mode if a ‘0’ in any bit ment data from the temperature conversion. location from C0 to C7 is written to the Configura- tion register. The TC77 is in the Continuous 4.3 Manufacturer’s ID Register (M_ID) Conversion mode at power-up. The Manufacturer’s Identification code is contained in It is recommended that the user write all ‘0’s or all ‘1’s this read only register. The Manufacturer ID register is to the Configuration register because other bit codes only available for a read operation when the TC77 is in may put the TC77 in a test mode used for calibration Shutdown mode. The Manufacturer’s ID code is con- and production verification tests. Section 3.3 lists the tained in bits 15:8 and is equal to 54 hex to indicate a Configuration register bit codes that can be written to Microchip device. Bits 1:0 are undefined and will be tri- the TC77 without having the device enter a production state outputs during a read sequence, while bits 7:2 are test mode. set to ‘0’. During Shutdown mode, the serial bus is still active. The current consumption of the TC77 will be less than 1µA during the time between serial communication.  2002 Microchip Technology Inc. DS20092A-page 11

TC77 5.0 APPLICATION INFORMATION The TC77 does not require any additional components in order to measure temperature. However, it is recom- mended that a decoupling capacitor of 0.1µF to 1µF be provided between the V and V (Ground) pins (a DD SS high frequency ceramic capacitor should be used). It is necessary for the capacitor to be located as close as possible to the integrated circuit (IC) power pins in order to provide effective noise protection to the TC77. The TC77 measures temperature by monitoring the voltage of a diode located on the IC die. A low-imped- ance thermal path between the die and the printed cir- cuit board (PCB) is provided by the IC pins of the TC77. Therefore, the TC77 effectively monitors the tempera- ture of the PCB board. The thermal path between the ambient air is not as efficient because the plastic IC housing package functions as a thermal insulator. Thus, the ambient air temperature (assuming that a large temperature gradient exists between the air and PCB) has only a small effect on the temperature measured by the TC77. A potential for self-heating errors can exist if the TC77 SPI communication lines are heavily loaded. Typically, the self-heating error is negligible because of the rela- tively small current consumption of the TC77. A tem- perature accuracy error of approximately 0.5°C will result from self-heating if the SPI communication pins sink/source the maximum current specified for the TC77. Therefore, to maximize the temperature accu- racy, the output loading of the SPI signals should be minimized. DS20092A-page 12  2002 Microchip Technology Inc.

TC77 6.0 PACKAGING INFORMATION 6.1 Package Marking Information 5-Lead SOT-23 Example: TC77-3.3MCTTR = CN XXNN CP57 TC77-5.0MCTTR = CP 8-Lead SOIC (150 mil) Example: XXXXXXXX TC77-33 XXXXYYWW I/SN0222 NNN 057 Legend: XX...X Customer specific information* Y Year code (last digit of calendar year) YY Year code (last 2 digits of calendar year) WW Week code (week of January 1 is week ‘01’) NNN Alphanumeric traceability code Note: In the event the full Microchip part number cannot be marked on one line, it will be carried over to the next line thus limiting the number of available characters for customer specific information. * Standard marking consists of Microchip part number, year code, week code, and traceability code. Please check with your Microchip Sales Office.  2002 Microchip Technology Inc. DS20092A-page 13

TC77 5-Lead Plastic Small Outline Transistor (OT) (SOT23) E E1 p B p1 D n 1 α c A A2 φ A1 β L Units INCHES* MILLIMETERS Dimension Limits MIN NOM MAX MIN NOM MAX Number of Pins n 5 5 Pitch p .038 0.95 Outside lead pitch (basic) p1 .075 1.90 Overall Height A .035 .046 .057 0.90 1.18 1.45 Molded Package Thickness A2 .035 .043 .051 0.90 1.10 1.30 Standoff § A1 .000 .003 .006 0.00 0.08 0.15 Overall Width E .102 .110 .118 2.60 2.80 3.00 Molded Package Width E1 .059 .064 .069 1.50 1.63 1.75 Overall Length D .110 .116 .122 2.80 2.95 3.10 Foot Length L .014 .018 .022 0.35 0.45 0.55 Foot Angle φ 0 5 10 0 5 10 Lead Thickness c .004 .006 .008 0.09 0.15 0.20 Lead Width B .014 .017 .020 0.35 0.43 0.50 Mold Draft Angle Top α 0 5 10 0 5 10 Mold Draft Angle Bottom β 0 5 10 0 5 10 * Controlling Parameter § Significant Characteristic Notes: Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed .010” (0.254mm) per side. JEDEC Equivalent: MO-178 Drawing No. C04-091 DS20092A-page 14  2002 Microchip Technology Inc.

TC77 8-Lead Plastic Small Outline (SN) – Narrow, 150 mil (SOIC) E E1 p D 2 B n 1 h α 45° c A A2 φ β L A1 Units INCHES* MILLIMETERS Dimension Limits MIN NOM MAX MIN NOM MAX Number of Pins n 8 8 Pitch p .050 1.27 Overall Height A .053 .061 .069 1.35 1.55 1.75 Molded Package Thickness A2 .052 .056 .061 1.32 1.42 1.55 Standoff § A1 .004 .007 .010 0.10 0.18 0.25 Overall Width E .228 .237 .244 5.79 6.02 6.20 Molded Package Width E1 .146 .154 .157 3.71 3.91 3.99 Overall Length D .189 .193 .197 4.80 4.90 5.00 Chamfer Distance h .010 .015 .020 0.25 0.38 0.51 Foot Length L .019 .025 .030 0.48 0.62 0.76 Foot Angle φ 0 4 8 0 4 8 Lead Thickness c .008 .009 .010 0.20 0.23 0.25 Lead Width B .013 .017 .020 0.33 0.42 0.51 Mold Draft Angle Top α 0 12 15 0 12 15 Mold Draft Angle Bottom β 0 12 15 0 12 15 * Controlling Parameter § Significant Characteristic Notes: Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed .010” (0.254mm) per side. JEDEC Equivalent: MS-012 Drawing No. C04-057  2002 Microchip Technology Inc. DS20092A-page 15

TC77 NOTES: DS20092A-page 16  2002 Microchip Technology Inc.

TC77 ON-LINE SUPPORT SYSTEMS INFORMATION AND UPGRADE HOT LINE Microchip provides on-line support on the Microchip World Wide Web site. The Systems Information and Upgrade Line provides The web site is used by Microchip as a means to make system users a listing of the latest versions of all of files and information easily available to customers. To Microchip's development systems software products. view the site, the user must have access to the Internet Plus, this line provides information on how customers and a web browser, such as Netscape® or Microsoft® can receive the most current upgrade kits.The Hot Line Internet Explorer. Files are also available for FTP Numbers are: download from our FTP site. 1-800-755-2345 for U.S. and most of Canada, and Connecting to the Microchip Internet Web Site 1-480-792-7302 for the rest of the world. The Microchip web site is available at the following URL: 092002 www.microchip.com The file transfer site is available by using an FTP ser- vice to connect to: ftp://ftp.microchip.com The web site and file transfer site provide a variety of services. Users may download files for the latest Development Tools, Data Sheets, Application Notes, User's Guides, Articles and Sample Programs. A vari- ety of Microchip specific business information is also available, including listings of Microchip sales offices, distributors and factory representatives. Other data available for consideration is: • Latest Microchip Press Releases • Technical Support Section with Frequently Asked Questions • Design Tips • Device Errata • Job Postings • Microchip Consultant Program Member Listing • Links to other useful web sites related to Microchip Products • Conferences for products, Development Systems, technical information and more • Listing of seminars and events  2002 Microchip Technology Inc. DS20092A-page 17

TC77 READER RESPONSE It is our intention to provide you with the best documentation possible to ensure successful use of your Microchip prod- uct. If you wish to provide your comments on organization, clarity, subject matter, and ways in which our documentation can better serve you, please FAX your comments to the Technical Publications Manager at (480) 792-4150. Please list the following information, and use this outline to provide us with your comments about this document. To: Technical Publications Manager Total Pages Sent ________ RE: Reader Response From: Name Company Address City / State / ZIP / Country Telephone: (_______) _________ - _________ FAX: (______) _________ - _________ Application (optional): Would you like a reply? Y N Device: TC77 Literature Number: DS20092A Questions: 1. What are the best features of this document? 2. How does this document meet your hardware and software development needs? 3. Do you find the organization of this document easy to follow? If not, why? 4. What additions to the document do you think would enhance the structure and subject? 5. What deletions from the document could be made without affecting the overall usefulness? 6. Is there any incorrect or misleading information (what and where)? 7. How would you improve this document? DS20092A-page 18  2002 Microchip Technology Inc.

TC77 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. PART NO. -X.X X XX Examples: a) TC77-3.3MOA: 3.3V Thermal Sensor in Device Supply Temperature Package SOIC package. Voltage Range b) TC77-5.0MOA: 5.0V Thermal Sensor in SOIC package. c) TC77-3.3MOATR: 3.3V Thermal Sensor in Device: TC77: Thermal Sensor with SPI Interface SOIC package, Tape and Reel. d) TC77-5.0MOATR: 5.0V Thermal Sensor in Supply Voltage: 3.3 = VDD = Accuracy optimized for 3.3V SOIC package, Tape and Reel. 5.0 = V = Accuracy optimized for 5.0V DD e) TC77-3.3MCTTR: 3.3V Thermal Sensor in SOT-23 package, Tape and Reel. Temperature Range: M = -55°C to +125°C f) TC77-5.0MCTTR: 5.0V Thermal Sensor in SOT-23 package, Tape and Reel. Package: CTTR = Plastic Small Outline Transistor (SOT-23), 5-lead (Tape and Reel only) OA = Plastic SOIC, (150 mil Body), 8-lead Sales and Support Data Sheets Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recom- mended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following: 1. Your local Microchip sales office 2. The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277 3. The Microchip Worldwide Site (www.microchip.com) Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using. New Customer Notification System Register on our web site (www.microchip.com/cn) to receive the most current information on our products.  2002 Microchip Technology Inc. DS20092A-page19

TC77 NOTES: DS20092A-page 20  2002 Microchip Technology Inc.

Information contained in this publication regarding device Trademarks applications and the like is intended through suggestion only and may be superseded by updates. It is your responsibility to The Microchip name and logo, the Microchip logo, KEELOQ, ensure that your application meets with your specifications. MPLAB, PIC, PICmicro, PICSTART and PRO MATE are No representation or warranty is given and no liability is registered trademarks of Microchip Technology Incorporated assumed by Microchip Technology Incorporated with respect in the U.S.A. and other countries. to the accuracy or use of such information, or infringement of FilterLab, microID, MXDEV, MXLAB, PICMASTER, SEEVAL patents or other intellectual property rights arising from such and The Embedded Control Solutions Company are use or otherwise. Use of Microchip’s products as critical com- registered trademarks of Microchip Technology Incorporated ponents in life support systems is not authorized except with in the U.S.A. express written approval by Microchip. No licenses are con- veyed, implicitly or otherwise, under any intellectual property dsPIC, dsPICDEM.net, ECONOMONITOR, FanSense, rights. FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, microPort, Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode and Total Endurance are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. Serialized Quick Turn Programming (SQTP) is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. © 2002, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. Microchip received QS-9000 quality system certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona in July 1999 and Mountain View, California in March 2002. The Company’s quality system processes and procedures are QS-9000 compliant for its PICmicro® 8-bit MCUs, KEELOQ® code hopping devices, Serial EEPROMs, microperipherals, non-volatile memory and analog products. In addition, Microchip’s quality system for the design and manufacture of development systems is ISO 9001 certified.  2002 Microchip Technology Inc. DS20092A - page 21

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Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: M icrochip: TC77-3.3MOA TC77-5.0MOA TC77-5.0MOATR TC77-3.3MCTTR TC77-3.3MOATR TC77-5.0MCTTR TC77- 5.0MCTTR-VAO