Datasheet

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DXP

DXN

V+

SCL

SDA

THERM

+5V

SMBus

Controller

GND

ALERTTHERM2/

OneChannelLocal

OneChannelRemote

TMP431

V+

SCL

SDA

+5V

SMBus

Controller

GND

DXP1

DXN1

DXP2

DXN2

OneChannelLocal

TwoChannelsRemote

TMP432

ALERT

THERM2

THERM

TMP432

TMP431

TMP432

www.ti.com

SBOS441F –SEPTEMBER 2009–REVISED AUGUST 2013

±1°C Temperature Sensor with Series-R,

η-Factor, and Automatic Beta Compensation

Check for Samples: TMP431, TMP432

FEATURES

DESCRIPTION

The TMP431 and TMP432 are remote temperature

234

• ±1°C REMOTE DIODE SENSOR

sensor monitors with a built-in local temperature

• ±1°C LOCAL TEMPERATURE SENSOR

sensor. The remote temperature sensor diode-

• AUTOMATIC BETA COMPENSATION

connected transistors are typically low-cost, NPN- or

PNP-type transistors or diodes that are an integral

• η-FACTOR CORRECTION

part of microcontrollers, microprocessors, or FPGAs.

• PROGRAMMABLE THRESHOLD LIMITS

Remote accuracy is ±1°C for multiple IC

• TWO-WIRE/ SMBus™ SERIAL INTERFACE

manufacturers, with no calibration needed. The Two-

• MINIMUM AND MAXIMUM TEMPERATURE

Wire serial interface accepts SMBus write byte, read

MONITORS

byte, send byte, and receive byte commands to

• MULTIPLE INTERFACE ADDRESSES

program the alarm thresholds and to read

temperature data. DLP

• ALERT/THERM2 PIN CONFIGURATION

The TMP431/32 include beta compensation

• DIODE FAULT DETECTION

(correction), series resistance cancellation,

programmable non-ideality factor, programmable

APPLICATIONS

resolution, programmable threshold limits, minimum

• LCD/DLP

/LCOS PROJECTORS

and maximum temperature monitors, wide remote

• SERVERS temperature measurement range (up to +150°C), and

diode fault detection and temperature alert function.

• INDUSTRIAL CONTROLLERS

The TMP431 is available in a VSSOP-8 package and

• CENTRAL OFFICE TELECOM EQUIPMENT

the TMP432 is available in a VSSOP-10 package.

• DESKTOP AND NOTEBOOK COMPUTERS

• STORAGE AREA NETWORKS (SAN)

• INDUSTRIAL AND MEDICAL EQUIPMENT

• PROCESSOR/FPGA TEMPERATURE

MONITORING

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.

2DLP is a registered trademark of Texas Instruments.

3SMBus is a trademark of Intel Corporation.

4All other trademarks are the property of their respective owners.

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.

Summary of content (42 pages)

PAGE 1
TM TMP431 TMP432 P432 www.ti.com SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 ±1°C Temperature Sensor with Series-R, η-Factor, and Automatic Beta Compensation Check for Samples: TMP431, TMP432 FEATURES DESCRIPTION • • • • • • • The TMP431 and TMP432 are remote temperature sensor monitors with a built-in local temperature sensor.
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TMP431 TMP432 SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 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.
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TMP431 TMP432 www.ti.com SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 ELECTRICAL CHARACTERISTICS At TA = –40°C to +125°C and VS = 2.7V to 5.5V, unless otherwise noted. TMP431 TMP432 PARAMETER CONDITIONS MIN TYP MAX UNIT TEMPERATURE ERROR Local Temperature Sensor Remote Temperature Sensor (1) TELOCAL TEREMOTE TA = –40°C to +125°C ±1.25 ±2.5 °C TA = +0°C to +100°C, VS = 3.3V ±0.25 ±1 °C TA = 0°C to +100°C, TDIODE = –40°C to +150°C, VS = 3.3V ±0.
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TMP431 TMP432 SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 www.ti.com ELECTRICAL CHARACTERISTICS (continued) At TA = –40°C to +125°C and VS = 2.7V to 5.5V, unless otherwise noted. TMP431 TMP432 PARAMETER CONDITIONS MIN TYP MAX UNIT POWER SUPPLY Specified Voltage Range VS Quiescent Current IQ Undervoltage Lockout Power-On Reset Threshold 2.7 5.5 V 45 μA 0.7 1 mA 3 10 μA 0.0625 Conversions per Second, VS = 3.3V 35 Eight Conversions per Second, VS = 3.
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TMP431 TMP432 www.ti.com SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 PIN CONFIGURATIONS DGK PACKAGE VSSOP-8 (TOP VIEW) V+ 1 DXP 2 8 SCL 7 SDA TMP431 DXN 3 6 ALERT/THERM2 THERM 4 5 GND TMP431 PIN ASSIGNMENTS TMP431 NO.
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TMP431 TMP432 SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 www.ti.com TYPICAL CHARACTERISTICS At TA = +25°C and VS = 3.3V, unless otherwise noted. REMOTE TEMPERATURE ERROR vs TEMPERATURE LOCAL TEMPERATURE ERROR vs TEMPERATURE 3 Local Temperature Error (°C) Remote Temperature Error (°C) 3 2 1 0 -1 -2 Beta Compensation Disabled. GND Collector-Connected Transistor with n-Factor = 1.008.
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TMP431 TMP432 www.ti.com SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 TYPICAL CHARACTERISTICS (continued) At TA = +25°C and VS = 3.3V, unless otherwise noted. REMOTE TEMPERATURE ERROR vs SERIES RESISTANCE (Low-Beta Transistor) REMOTE TEMPERATURE ERROR vs SERIES RESISTANCE 2.5 GND Collector-Connected Transistor, 2N3906 (PNP) (1)(2) 2 1 0 Diode-Connected Transistor, 2N3906 (PNP) (2) -1 NOTES (1): Temperature offset is the result of h-factor being automatically set to 1.000.
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TMP431 TMP432 SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 www.ti.com PARAMETRIC MEASUREMENT INFORMATION TYPICAL CONNECTIONS Figure 11. SERIES RESISTANCE CONFIGURATION (a) GND Collector-Connected Transistor RS (1) DXP DXN RS (1) (b) Diode-Connected Transistor (1) RS DXP DXN RS (1) (1) RS should be less than 1kΩ; see Filtering section. Figure 12. Figure 13.
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TMP431 TMP432 www.ti.com SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 APPLICATION INFORMATION The TMP431 (two-channel) and TMP432 (threechannel) are digital temperature sensors that combine a local die temperature measurement channel and a remote junction temperature measurement channel in a single VSSOP-8 (TMP431) or VSSOP-10 (TMP432) package. They are Two-Wire- and SMBus interface-compatible and are specified over a temperature range of –40°C to +125°C.
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TMP431 TMP432 SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 www.ti.com +5V 0.1mF (1) GND collector-connected transistor configuration : Series Resistance RS V+ (2) SCL 2 DXP CDIFF SDA 3 10kW (typ) 10kW (typ) 10kW (typ) 8 TMP431 (3) (2) RS 10kW (typ) 1 7 SMBus Controller DXN ALERT/THERM2 THERM 6 4 Fan Controller GND (1) 5 Diode-connected configuration : (2) RS (3) (2) NOTES: (1) Diode-connected configuration provides better settling time.
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TMP431 TMP432 www.ti.com SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 TEMPERATURE MEASUREMENT DATA Temperature measurement data are taken over a default range of 0°C to +127°C for both local and remote locations. However, measurements from –55°C to +150°C can be made both locally and remotely by reconfiguring the TMP431/32 for the extended temperature range, as described in this section.
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TMP431 TMP432 SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 www.ti.com Table 2. Decimal Fraction Temperature Data Format (Local and Remote Temperature Low Bytes) TEMP (°C) (1) TEMPERATURE REGISTER LOW BYTE VALUE (0.0625°C RESOLUTION) (1) STANDARD AND EXTENDED BINARY HEX 0 0000 0000 00 0.0625 0001 0000 10 0.1250 0010 0000 20 0.1875 0011 0000 30 0.2500 0100 0000 40 0.3125 0101 0000 50 0.3750 0110 0000 60 0.4375 0111 0000 70 0.5000 1000 0000 80 0.5625 1001 0000 90 0.
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TMP431 TMP432 www.ti.com SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 Table 3.
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TMP431 TMP432 SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 www.ti.com Table 4.
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TMP431 TMP432 www.ti.com SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 Table 4.
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TMP431 TMP432 SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 The local temperature high limit is obtained by reading the high byte from pointer address 05h and the low byte from pointer address 16h for the TMP4341 and 3Dh for the TMP432, or by using a two-byte read command from pointer address 05h. The power-on reset value of the local temperature high limit is 55h/00h (+85°C in standard temperature mode; +21°C in extended temperature mode).
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TMP431 TMP432 www.ti.com SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 Status Registers TMP431 Status Register Table 5. TMP431 Status Register Format TMP431 STATUS REGISTER (Read = 02h, Write = NA) BIT # BIT NAME POR VALUE (1) D7 D6 D5 D4 D3 D2 D1 D0 BUSY LHIGH LLOW RHIGH RLOW OPEN RTHRM LTHRM 0 (1) 0 0 0 0 0 0 0 The BUSY bit changes to ‘1’ almost immediately (<< 100μs) following power-up, as the TMP431 begins the first temperature conversion.
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TMP431 TMP432 SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 www.ti.com Status Registers (continued) TMP432 Status Register Table 6. TMP432 Status Register Format TMP432 STATUS REGISTER (Read = 02h, Write = NA) BIT # BIT NAME POR VALUE (1) D7 D6 D5 D4 D3 D2 D1 D0 BUSY 0 0 HIGH LOW OPEN THERM 0 0 (1) 0 0 0 0 0 0 0 The BUSY bit changes to ‘1’ almost immediately (<< 100μs) following power-up, as the TMP432 begins the first temperature conversion.
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TMP431 TMP432 www.ti.com SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 Configuration Register 1 The Configuration Register 1 sets the temperature range, controls shutdown mode, and determines how the ALERT/THERM2 pin functions. The Configuration Register is set by writing to pointer address 09h and read by reading from pointer address 03h. The MASK bit (bit 7) enables or disables the ALERT pin output if ALERT/THERM = 0. If ALERT/THERM = 1 then the MASK bit has no effect.
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TMP431 TMP432 SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 Configuration Register 2 Configuration Register 2 (pointer address 1Ah for the TMP431 and 3Fh for the TMP432) controls which temperature measurement channels are enabled and whether the external channels have the resistance correction feature enabled or not. The RC bit enables the resistance correction feature for the external temperature channels.
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TMP431 TMP432 www.ti.com SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 Conversion Rate Register The Conversion Rate Register (pointer address 0Ah) controls the rate at which temperature conversions are performed. This register adjusts the idle time between conversions but not the conversion timing itself, thereby allowing the TMP431/32 power dissipation to be balanced with the temperature register update rate. Table 9 shows the conversion rate options and corresponding current consumption.
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TMP431 TMP432 SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 Beta Compensation Configuration Register If the Beta Compensation Configuration Register is set to '1xxx' (beta correction enabled) for a given remote channel at the beginning of each temperature conversion, the TMP431/32 automatically detect if the sensor is diode-connected or GND collectorconnected, select the proper beta range, and measure the sensor temperature appropriately.
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TMP431 TMP432 www.ti.com SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 η-Factor Correction Register The TMP431/32 allow for a different η-factor value to be used for converting remote channel measurements to temperature. The remote channel uses sequential current excitation to extract a differential VBE voltage measurement to determine the temperature of the remote transistor. Equation 1 relates this voltage and temperature.
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TMP431 TMP432 SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 www.ti.com Consecutive Alert Register Identification Registers The value in the Consecutive Alert Register (address 22h) determines how many consecutive out-of-limit measurements must occur on a measurement channel before the ALERT or the THERM signal is activated. The value in this register does not affect bits in the Status Register. Values of one, two, three, or four consecutive conversions can be selected; one conversion is the default.
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TMP431 TMP432 www.ti.com SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 Fault Status Register The Fault Status Register indicates if there is a fault on the remote channel diode. Bit 2 is set if remote channel 2 is open or faultily connected. Similarly, bit 1 corresponds to remote channel 1. Channel Mask Register The Channel Mask Register controls individual channel masking. When a channel is masked, the ALERT pin is asserted when the masked channel reads a diode fault or out-of-limit error.
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TMP431 TMP432 SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 www.ti.com TIMING DIAGRAMS The TMP431/32 are Two-Wire and SMBuscompatible. Figure 18 to Figure 22 describe the various operations on the TMP431/32. Bus definitions are given below. Parameters for Figure 18 are defined in Table 16. Bus Idle: Both SDA and SCL lines remain high. Start Data Transfer: A change in the state of the SDA line, from high to low, while the SCL line is high, defines a START condition.
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TMP431 TMP432 www.ti.
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TMP431 TMP432 SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 www.ti.
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TMP431 TMP432 www.ti.com SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 HIGH-SPEED MODE In order for the Two-Wire bus to operate at frequencies above 400kHz, the master device must issue a High-speed mode (Hs-mode) master code (00001XXX) as the first byte after a START condition to switch the bus to high-speed operation. The TMP431/32 do not acknowledge this byte, but switch the input filters on SDA and SCL and the output filter on SDA to operate in Hs-mode, allowing transfers at up to 3.4MHz.
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TMP431 TMP432 SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 www.ti.com THERM Limit and ALERT High Limit Measured Temperature ALERT Low Limit and THERM Limit Hysteresis THERM ALERT SMBus ALERT Read Read Read Time Figure 23. SMBus Alert Timing Diagram If multiple devices on the bus respond to the SMBus Alert command, arbitration during the slave address portion of the SMBus Alert command determines which device clears its alert status.
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TMP431 TMP432 www.ti.com SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 REMOTE SENSING The TMP431/32 are designed to be used with either discrete transistors or substrate transistors built into processor chips and ASICs. Either NPN- or PNP-type transistors can be used, as long as the base-emitter junction is used as the remote temperature sense. NPN transistors must be diode-connected. PNP transistors can either be transistor- or diodeconnected (see Figure 15).
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TMP431 TMP432 SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 www.ti.com LAYOUT CONSIDERATIONS Remote temperature sensing on the TMP431/32 measures very small voltages using very low currents; therefore, noise at the IC inputs must be minimized. Most applications using the TMP431/32 have high digital content, with several clocks and logic level transitions creating a noisy environment. Layout should conform to the following guidelines: 1.
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TMP431 TMP432 www.ti.com SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 REVISION HISTORY NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision E (December 2012) to Revision F Page • Changed Ordering Information table .................................................................................................................................... 2 • Added five new register descriptions ..................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 18-Oct-2013 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.
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PACKAGE MATERIALS INFORMATION www.ti.com 17-Apr-2014 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing TMP431ADGKR VSSOP DGK 8 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 TMP431ADGKT VSSOP DGK 8 250 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 TMP431BDGKR VSSOP DGK 8 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 17-Apr-2014 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TMP431ADGKR VSSOP DGK 8 2500 366.0 364.0 50.0 TMP431ADGKT VSSOP DGK 8 250 366.0 364.0 50.0 TMP431BDGKR VSSOP DGK 8 2500 366.0 364.0 50.0 TMP431BDGKT VSSOP DGK 8 250 366.0 364.0 50.0 TMP431CDGKR VSSOP DGK 8 2500 358.0 335.0 35.0 TMP431CDGKT VSSOP DGK 8 250 366.0 364.0 50.
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