TMP122-EP www.ti.com .......................................................................................................................................................................................... SBOS454 – NOVEMBER 2008 1.5°C ACCURATE PROGRAMMABLE DIGITAL TEMPERATURE SENSORS WITH SPI™ INTERFACE FEATURES 1 • Digital Output: SPI-Compatible Interface • Programmable Resolution: 9 to 12 Bits + Sign • Aaccuracy: ±1.5°C from -25°C to 85°C (max) ±2.0°C from -55°C to 125°C (max) • Low Quiescent Current: 50 µA • Wide Supply Range: 2.7 V to 5.5 V • Tiny SOT23-6 Package • Operation to 150°C • Programmable High/Low Setpoints 2 APPLICATIONS • • • • • • • • • Power-Supply Temperature Monitoring Computer Peripheral Thermal Protection Notebook Computers Cell Phones Battery Management Office Machines Thermostat Controls Environmental Monitoring and HVAC Electromechanical Device Temperature DESCRIPTION The TMP122 is an SPI-compatible temperature sensor available in an SOT23-6 package. Requiring only a pull-up resistor for complete function, the TMP122 temperature sensor is capable of measuring temperatures within 2°C of accuracy over a temperature range of -55°C to 125°C, with operation up to 150°C. Programmable resolution, programmable set points and shut down function provide versatility for any application. Low supply current and a supply range from 2.7 V to 5.5 V make the TMP122 an excellent candidate for low-power applications. The TMP122 is ideal for extended thermal measurement in a variety of communication, computer, consumer, environmental, industrial, and instrumentation applications. SUPPORTS DEFENSE, AEROSPACE, AND MEDICAL APPLICATIONS • • • • • • • (1) Controlled Baseline One Assembly/Test Site One Fabrication Site Available in Military (–55°C/125°C) Temperature Range (1) Extended Product Life Cycle Extended Product-Change Notification Product Traceability Additional temperature ranges are available - contact factory 1 2 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. SPI is a trademark of Motorola. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2008, Texas Instruments Incorporated TMP122-EP SBOS454 – NOVEMBER 2008 .......................................................................................................................................................................................... www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. ORDERING INFORMATION (1) PACKAGE (2) TA –55°C to 125°C (1) (2) SOT23-6 ORDERABLE PART NUMBER Tape and reel of 250 TMP122AMDBVTEP TOP-SIDE MARKING 122E For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI web site at www.ti.com. Package drawings, thermal data, and symbolization are available at www.ti.com/packaging. ABSOLUTE MAXIMUM RATINGS over operating free-air temperature range (unless otherwise noted) VALUE UNIT V+ Power supply 7 V VI Input voltage -0.3 to 7 V Inout current TJ (max) 10 mA Operating temperature range -55 to 150 °C Storage temperature range -60 to 150 °C Junction temperature 150 °C Lead temperature (soldering) 300 °C PIN CONFIGURATION 2 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TMP122-EP TMP122-EP www.ti.com .......................................................................................................................................................................................... SBOS454 – NOVEMBER 2008 ELECTRICAL CHARACTERISTICS over operating free-air temperature range (unless otherwise noted) PARAMETER Temperature input TEST CONDITIONS MIN Range Accuracy (temperature error) Resolution °C ±0.5 ±1.5 -55°C to 125°C ±1.0 ±2.0 -55°C to 150°C ±1.5 Selectable VIH °C °C/V ±0.0625 °C 0.7 (V+) V VIL 0.3 (V+) V 0 V ≤ VIN ≤ V+ ±1 µA VOL SO/I ISINK = 3mA 0.4 V VOH SO/I ISOURCE = 2mA VOL ALERT Leakage current ALERT (V+) - 0.4 V ISINK = 4mA 0 V ≤ VIN ≤ 6 V Input capacitance, SO/I, SCK, CS, ALERT 0.4 V ±1 µA 2.5 Reolution Selectable 9 to 12 + sign Conversion time 9 bit + sign 30 pF bits 40 10 bit + sign 60 80 11 bit + sign 120 160 240 320 12 bit + sign Power supply Operating range 2.7 5.5 Quiescent current IQ Serial bus inactive 50 75 Shutdown current ISD Serial bus inactive 0.1 1 Specified range -55 125 Operating range -55 150 Storage range Thermal resistance, θJA (1) UNIT 125 0.1 (1) Input current, SO/I, SCK, CS Temperature range MAX -25°C to 85°C vs supply Digital input/output TYP -55 -60 SOT23-6 surface-mount ms V µA °C 150 200 °C/W Specified for 12-bit resolution. Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TMP122-EP 3 TMP122-EP SBOS454 – NOVEMBER 2008 .......................................................................................................................................................................................... www.ti.com TYPICAL CHARACTERISTICS 4 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TMP122-EP TMP122-EP www.ti.com .......................................................................................................................................................................................... SBOS454 – NOVEMBER 2008 APPLICATION INFORMATION The TMP122 digital temperature sensor is optimal for thermal management and thermal protection applications. The TMP122 is SPI interface-compatible and specified for a temperature range of -55°C to 125°C. The TMP122 requires minimal external components for operation, needing only a pullup resistor on the ALERT pin and a bypass capacitor on the supply. Bypass capacitors of 0.1 µF is recommended. Figure 1 shows typical connections for the TMP122. Figure 1. Typical Connections To maintain accuracy in applications requiring air or surface temperature measurement, care should be taken to isolate the package and leads from ambient air temperature. Figure 2. Multiple Command Sequence COMMUNICATING WITH THE TMP122 The TMP122 converts continuously. If CS is brought low during a conversion the conversion process continues, but the last completed conversion is available at the output register. Communication with the TMP122 is initiated by pulling CS low. The first 16 clocks of data transfer will return temperature data from the temperature sensors. The 16-bit data word is clocked out sign bit first, followed by the MSB. Any portion of the 16-bit word may be read before raising CS. If the user wishes to continue with CS low, the following 16 clocks transfer in a READ or WRITE command. READ and WRITE commands are described in Table 1 and Table 2. The READ command contains an embedded address in bits D4 and D3 to identify which register to read. Bits D4 and D3 are internally registered and will hold their value following a READ command until an entire 16-bit read is completed by the user. The completion of the 16-bit READ acknowledges that the READ command has been completed. If the user issues a READ command and then raises CS with less than 16 subsequent clocks, the data from that register will be available at the next fall of CS. Teh registered READ address will remain in effect until a full 16 clocks have been received. After the compleation of a 16-bit READ from the part, the READ address is reset to return data from the Temperature Register. A WRITE command to a register will not change the READ address registered. For further discussion on the READ address register, see the Read Address Register section. Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TMP122-EP 5 TMP122-EP SBOS454 – NOVEMBER 2008 .......................................................................................................................................................................................... www.ti.com Multiple commands may be strung together as illustrated in Figure 2. The TMP122 accepts commands alternating with 16-bit response data. On lowering CS, the part always responds with a READ from the address location indicated by the READ address register. If the next command is a READ command then data is returned from the address specified by the READ command with the 16th clock resetting the READ address register to the default temperature register. The TMP122 then expects a 16-bit command. If the command is a WRITE command, then the 16 clocks following the command will again return temperature data. Figure 3, Figure 4, Figure 5, and Figure 6 detail the communication sequences. Table 1. READ Command READ Command D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Temperature 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Configuration register 1 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 Low temperature threshold 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 High temperature threshold 1 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 Table 2. WRITE Command WRITE Command D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Temperature 0 0 0 0 D1 D0 R1 R0 F1 F0 POL TM1 TM0 0 1 0 Low temperature threshold T12 T11 T10 T9 T8 T7 T6 T5 T4 T3 T2 T1 T0 1 0 0 High temperature threshold T12 T11 T10 T9 T8 T7 T6 T5 T4 T3 T2 T1 T0 1 1 0 Shutdown command x x x x x x x x 1 1 1 1 1 1 1 1 Figure 3. READ followed by WRITE Command to TLOW/THIGH Register Figure 4. READ followed by WRITE Command to Configuration Register 6 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TMP122-EP TMP122-EP www.ti.com .......................................................................................................................................................................................... SBOS454 – NOVEMBER 2008 Figure 5. READ followed by READ Command and Response Figure 6. Data READ READ ADDRESS REGISTER Figure 7 shows the internal register structure of the TMP122/TMP124. Table III describes the addresses of the registers available. The READ address register uses the two bits to identify which of the data registers should respond to a read command. Following a complete 16-bit read, the READ address register is reset to the default power-up state of P1/P0 equal 0/0. Figure 7. Internal Register Structure Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TMP122-EP 7 TMP122-EP SBOS454 – NOVEMBER 2008 .......................................................................................................................................................................................... www.ti.com Table 3. Pointer Addresses P1 P0 REGISTER 0 0 Temperature Register (READ only) 0 1 Configuration Register (READ/WRITE) 1 0 TLOW Register (READ/WRITE) 1 1 THIGH Register (READ/WRITE) TEMPERATURE REGISTER The Temperature Register of the TMP122 is a 16-bit, signed read-only register that stores the output of the most recent conversion. The TMP122 is specified for the temperature range of -55°C to 125°C with operation from -55°C to 150°C. Up to 16 bits can be read to obtain data and are described in Table 4. The first 13 bits are used to indicate temperature where bit D2 is 1, and D1, D0 are in a high impedance state. Data format for temperature is summarized in Table 5. Following power-up or reset, the Temperature Register will read 0°C until the first conversion is complete. Table 4. Temperature Register D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 T12 T11 T10 T9 T8 T7 T6 T5 T4 T3 T2 T1 T0 1 Z Z Table 5. Temperature Data Format (1) TEMPERATURE (°c) DIGITAL OUTPUT (1) (BINARY) HEX 150 0100 1011 0000 0111 4B07 125 0011 1110 1000 0111 3E87 25 0000 1100 1000 0111 0C87 0.0625 0000 0000 0000 1111 000F 0 0000 0000 0000 0111 0007 -0.0625 1111 1111 1111 1111 FFFF -25 1111 0011 1000 0111 F387 -55 1110 0100 1000 0111 E487 The last two bits are high impedance and are shown as 11 in the table. The user can obtain 9, 10, 11, or 12 bits of resolution by addressing the Configuration Register and setting the resolution bits accordingly. For 9-, 10-, or 11-bit resolution, the most significant bits in the Temperture Register are used with the unused LSBs set to zero. CONFIGURATION REGISTER The Configuration Register is a 16-bit read/write register used to store bits that control the operational modes of the temperature sensor. Read/write operations are performed MSB first. The format of the Configuration Register for the TMP122 is shown in Table 6, followed by a break-down of the register bits. The power-up/reset value of the Configuration Register bits R1/R0 equal 1/1, all other bits equal zero. Table 6. Configuration Register D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 0 0 0 0 D1 D0 R1 R0 F1 F0 POL TM1 TM0 0 1 0 SHUTDOWN MODE (SD) The Shutdown Mode of the TMP122 can be used to shut down all device circuitry except the serial interface. Shutdown mode occurs when the last 8 bits of the WRITE command are equal to 1, and will occur once the current conversion is completed, reducing current consumption to less than 1 µA. To take the part out of shutdown, send any command or pattern after the 16-bit read with the last 8 bits not equal to one. Power on default is in active mode. 8 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TMP122-EP TMP122-EP www.ti.com .......................................................................................................................................................................................... SBOS454 – NOVEMBER 2008 THERMOSTAT MODE (TM1/TM0) The Thermostat Mode bits of the TMP122 indicate to the device whether to operate in Comparator Mode, Interrupt Mode or Interrupt Comparator Mode. For more information on Comparator and Interrupt Mode, see text HIGH and LOW limit registers. The bit assignments for thermostat mode are described in Table 7. Power on default is comparator mode. Table 7. Mode Settings TM1 TM0 MODE OF OPERATION 0 0 Comparator mode 0 1 Interrupt mode 1 0 Interrupt comparator mode 1 1 Reserved POLARITY (POL) The Polarity Bit of the TMP122 adjusts the polarity of the ALERT pin output. By default, POL = 0 and the ALERT pin will be active LOW, as shown in Figure 8. For POL = 1 the ALERT Pin will be active HIGH, and the state of the ALERT Pin is inverted. Figure 8. ALERT Output Transfer Function Diagrams FAULT QUEUE (F1/F0) A fault condition occurs when the measured temperature exceeds the limits set in the THIGH and TLOW registers. The Fault Queue is provided to prevent a false alert due to environmental noise and requires consecutive fault measurements to trigger the alert function of the TMP122. Table 8 defines the number of consecutive faults required to trigger a consecutive alert condition. Power-on default for F1/F0 is 0/0. Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TMP122-EP 9 TMP122-EP SBOS454 – NOVEMBER 2008 .......................................................................................................................................................................................... www.ti.com Table 8. Fault Settings F1 F0 CONSECUTIVE FAULTS 0 0 1 0 1 2 1 0 4 1 1 6 HIGH AND LOW LIMIT REGISTERS In Comparator Mode (TM1/TM0 = 0/0), the ALERT Pin of the TMP122 becomes active when the temperature equals or exceeds the value in THIGH and generates a consecutive number of faults according to fault bits F1 and F0. The ALERT pin will remain active until the temperature falls below the indicated TLOW value for the same number of faults. In Interrupt Mode (TM1/TM0 = 0/1) the ALERT pin becomes active when the temperature equals or exceeds THIGH for a consecutive number of fault conditions. The ALERT pin remains active until a read operation of any register occurs. The ALERT pin will also be cleared if the device is placed in Shutdown Mode. Once the ALERT pin is cleared, it will only become active again by the temperature falling below TLOW. When the temperature falls below TLOW, the ALERT pin becomes active and remains active until cleared by a read operation of any register. Once the ALERT pin is cleared, the above cycle will repeat with the ALERT pin becoming active when the temperature equals or exceeds THIGH. In Interrupt/Comparator Mode (TM1/TM0 = 1/0), the ALERT Pin of the TMP122 becomes active when the temperature equals or exceeds the value in THIGH and generates a consecutive number of faults according to fault bits F1 and F0. The ALERT pin will remain active until the temperature falls below the indicated TLOW value for the same number of faults and a communication with the device has occurred after that point. Operational modes are represented in Figure 8. Table 9 and Table 10 describe the format for the THIGH and TLOW registers. Power-up reset values for THIGH and TLOW are: THIGH = 80°C and TLOW = 75°C. The format of the data for THIGH and TLOW is the same as for the Temperature Register. TABLE IX. THIGH Register. All 13 bits for the Temperature, THIGH, and TLOW registers are used in the comparisons for the ALERT function for all converter resolutions. The three LSBs in THIGH and TLOW can affect the ALERT output even if the converter is configured for 9-bit resolution. Table 9. THIGH Register D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 H12 H11 H10 H9 H8 H7 H6 H5 H4 H3 H2 H1 H0 1 1 0 Table 10. TLOW Register D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 L12 L11 L10 L9 L8 L7 L6 L5 L4 L3 L2 L1 L0 1 0 0 CONVERTER RESOLUTION (R1/R0) The Converter Resolution Bits control the resolution of the internal analog-to-digital (A/D) converter. This allows the user to maximize efficiency by programming for higher resolution or faster conversion time. Table 11 identifies the resolution bits and the relationship between resolution and conversion time. The TMP122 has a default resolution of 12 bits. Table 11. Resolution 10 R1 R2 RESOLUTION CONVERSION TIME (TYPICAL) 0 0 9 bits (0.5°C) + sign 30 ms 0 1 10 bits (0.25°C) + sign 60 ms 1 0 11 bits (0.125°C) + sign 120 ms 1 1 12 bits (0.0625°C) + sign 240 ms Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TMP122-EP TMP122-EP www.ti.com .......................................................................................................................................................................................... SBOS454 – NOVEMBER 2008 DELAY TIME The Delay Bits control the amount of time delay between each conversion. This feature allows the user to maximize power savings by eliminating unnecessary conversions, and minimizing current consumption. During active conversion the TMP122 typically requires 50 µA of current for approximately 0.25s conversion time, and approximately 20 µA for idle times between conversions. Delay settings are identified in Table 12 as conversion time and period, and are shown in Figure 9. Default power up is D1/D0 equal 0/0. Conversion time and conversion periods scale with resolution. Conversion period denotes time between conversion starts. Table 12. Conversion Delay for 12-Bit Resolution D1 D2 CONVERSION TIME CONVERSION PERIOD 0 0 0.25 s 0.25 s 0 1 0.25 s 0.5 s 1 0 0.25 s 1s 1 1 0.25 s 8s Figure 9. Conversion Time and Period Description TIMING DIAGRAMS The TMP122 is SPI compatible. Figure 10 to Figure 12 describe the various timing parameters of the TMP122 with timing definitions in Table 13. Table 13. Timing Description PARAMETER MIN MAX 100 UNIT t1 SCK period t2 Data in to rising edge SCK setup time ns t3 SCK falling edge to output data delay t4 SCK rising edge to input data hold time 20 t5 CS to rising edge SCK set-up time 40 t6 CS to output data delay 30 ns t7 CS rising edge to output high impedance 30 ns 20 ns 30 ns ns Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TMP122-EP ns 11 TMP122-EP SBOS454 – NOVEMBER 2008 .......................................................................................................................................................................................... www.ti.com Figure 10. Output Data Timing Diagram Figure 11. High Impedance Output Timing Diagram Figure 12. Input Data Timing Diagram 12 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TMP122-EP PACKAGE OPTION ADDENDUM www.ti.com 26-Oct-2009 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Eco Plan (2) Qty TMP122AMDBVTEP ACTIVE SOT-23 DBV 6 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR V62/09607-01XE ACTIVE SOT-23 DBV 6 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR Lead/Ball Finish MSL Peak Temp (3) (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. 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OTHER QUALIFIED VERSIONS OF TMP122-EP : • Catalog: TMP122 NOTE: Qualified Version Definitions: • Catalog - TI's standard catalog product Addendum-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 17-Oct-2009 TAPE AND REEL INFORMATION *All dimensions are nominal Device TMP122AMDBVTEP Package Package Pins Type Drawing SPQ SOT-23 250 DBV 6 Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 180.0 8.4 Pack Materials-Page 1 3.2 B0 (mm) K0 (mm) P1 (mm) 3.1 1.39 4.0 W Pin1 (mm) Quadrant 8.0 Q3 PACKAGE MATERIALS INFORMATION www.ti.com 17-Oct-2009 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TMP122AMDBVTEP SOT-23 DBV 6 250 190.5 212.7 31.8 Pack Materials-Page 2 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. 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