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TMP431 Datasheet(PDF) 9 Page - Texas Instruments |
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TMP431 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 42 page TMP431 TMP432 www.ti.com SBOS441F – SEPTEMBER 2009 – REVISED AUGUST 2013 APPLICATION INFORMATION controlling the emitter current provided acceptable The TMP431 (two-channel) and TMP432 (three- temperature measurement results. At 90nm process channel) are digital temperature sensors that geometry and below, however, the beta factor combine a local die temperature measurement continues to decrease and the premise that it is channel and a remote junction temperature independent of collector current becomes less measurement channel in a single VSSOP-8 certain. (TMP431) or VSSOP-10 (TMP432) package. They are Two-Wire- and SMBus interface-compatible and To manage this increasing temperature measurement are specified over a temperature range of –40°C to error, the TMP431/32 control the collector current +125°C. The TMP431/32 contain multiple registers instead of the emitter current. The TMP431/32 for holding configuration information, temperature automatically detect and choose the correct range measurement results, temperature comparator depending on the beta factor of the external maximum/minimum limits, and status information. transistor. This auto-ranging is performed at the User-programmed high and low temperature limits beginning of each temperature conversion in order to stored in the TMP431/32 can be used to trigger an correct for any changes in the beta factor as a result over/under temperature alarm (ALERT) on local and of temperature variation. The device can operate a remote temperatures. Additional thermal limits can be PNP transistor with a beta factor as low as 0.1. See programmed into the TMP431/32 and used to trigger the Beta Compensation Configuration Register another flag (THERM) that can be used to initiate a section for further information. system response to rising temperatures. SERIES RESISTANCE CANCELLATION For proper remote temperature sensing operation, the TMP431 requires only a transistor connected Series resistance in an application circuit that typically between DXP and DXN; the TMP432 requires results from printed circuit board (PCB) trace transistors conncected between DXP1 and DXN1, resistance and remote line length is automatically and between DXP2 and DXN2. cancelled by the TMP431/32, preventing what would otherwise result in a temperature offset. A total of up The SCL and SDA interface pins require pull-up to 1k Ω of series line resistance is cancelled by the resistors as part of the communication bus, while TMP431/32 if beta correction is disabled and up to ALERT and THERM are open-drain outputs that also 300 Ω of series line resistance is cancelled if beta need pull-up resistors. ALERT and THERM may be correction is enabled, eliminating the need for shared with other devices if desired for a wired-OR additional characterization and temperature offset implementation. A 0.1 μF power-supply bypass correction. See the two Remote Temperature Error vs capacitor is recommended for good local bypassing. Series Resistance typical characteristic curves See Figure 15 for a typical configuration of the (Figure 7 and Figure 8) for details on the effects of TMP431; see Figure 16 for a typical configuration of series resistance on sensed remote temperature the TMP432. error. BETA COMPENSATION DIFFERENTIAL INPUT CAPACITANCE Previous generations of remote junction temperature The TMP431/32 can tolerate differential input sensors were operated by controlling the emitter capacitance of up to 2200pF with minimal change in current of the sensing transistor. However, temperature error. The effect of capacitance on examination of the physics of a transistor shows that sensed remote temperature error is illustrated in VBE is actually a function of the collector current. If Figure 9 and Figure 10, Remote Temperature Error beta is independent of the collector current, then VBE vs Differential Capacitance. See the Filtering section may be calculated from the emitter current. In earlier for suggested component values where filtering generations of processors that contained PNP unwanted coupled signals is needed. transistors connected to these temperature sensors, Copyright © 2009–2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: TMP431 TMP432 |
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