Datasheet

TMP431

TMP432

SBOS441F –SEPTEMBER 2009–REVISED AUGUST 2013

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Beta Compensation Configuration Register

be GND collector-connected in this mode, but no beta

compensation factor is applied. When the beta

If the Beta Compensation Configuration Register is

correction is set to '0111' or the sensor is diode-

set to '1xxx' (beta correction enabled) for a given

connected (base shorted to collector), the η-factor

remote channel at the beginning of each temperature

used by the TMP431/32 is 1.008. When the beta

conversion, the TMP431/32 automatically detect if the

correction configuration is set to '1xxx' (beta

sensor is diode-connected or GND collector-

correction enabled) and the sensor is GND collector-

connected, select the proper beta range, and

connected (PNP collector to ground), the η-factor

measure the sensor temperature appropriately.

used by the TMP431/32 is 1.000. Table 10 shows the

If the Beta Compensation Configuration Register is read value for the selected beta ranges and the

set to '0111' (beta correction disabled) for a given appropriate η-factor used for each conversion.

channel, the automatic detection is bypassed and the

temperature is measured assuming a diode-

connected sensor. A PNP transistor may continue to

Table 10. Beta Compensation Configuration Register

BCx3-BCx0 BETA RANGE DESCRIPTION η-FACTOR TIME

1000 Automatically selected range 0 (0.10 < beta < 0.18) 1.000 126ms

1001 Automatically selected range 1 (0.16 < beta < 0.26) 1.000 126ms

1010 Automatically selected range 2 (0.24 < beta < 0.43) 1.000 126ms

1011 Automatically selected range 3 (0.35 < beta < 0.78) 1.000 126ms

1100 Automatically selected range 4 (0.64 < beta < 1.8) 1.000 126ms

1101 Automatically selected range 5 (1.4 < beta < 9.0) 1.000 126ms

1110 Automatically selected range 6 (6.7 < beta < 40.0) 1.000 126ms

1111 Automatically selected range 7 (beta > 27.0) 1.000 126ms

1111 Automatically detected diode connected sensor 1.008 93ms

0000 Manually selected range 0 (0.10 < beta < 0.5) 1.000 93ms

0001 Manually selected range 1 (0.13 < beta < 1.0) 1.000 93ms

0010 Manually selected range 2 (0.18 < beta < 2.0) 1.000 93ms

0011 Manually selected range 3 (0.3 < beta < 25) 1.000 93ms

0100 Manually selected range 4 (0.5 < beta < 50) 1.000 93ms

0101 Manually selected range 5 (1.1 < beta < 100) 1.000 93ms

0110 Manually selected range 6 (2.4 < beta < 150) 1.000 93ms

0111 Manually disabled beta correction 1.008 93ms

Product Folder Links: TMP431 TMP432