SBOS441I September 2009 – October 2019 TMP431 , TMP432
PRODUCTION DATA.
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 TMP43x automatically detect if the sensor is diode-connected or GND collector-connected, select the proper beta range, and measure the sensor temperature appropriately.
If the Beta Compensation Configuration Register is set to 0111 (beta correction disabled) for a given channel, the automatic detection is bypassed and the temperature is measured assuming a diode-connected sensor. A PNP transistor can continue to be GND collector-connected in this mode, but no beta compensation factor is applied. When the beta correction is set to 0111 or the sensor is diode-connected (base shorted to collector), the η-factor used by the TMP43x is 1.008. When the beta correction configuration is set to 1xxx (beta correction enabled) and the sensor is GND collector-connected (PNP collector to ground), the η-factor used by the TMP43x is 1.000. Table 10 shows the read value for the selected beta ranges and the appropriate η-factor used for each conversion.
BCx3-BCx0 | BETA RANGE DESCRIPTION | η-FACTOR | TIME |
---|---|---|---|
1000 | Automatically selected range 0 (0.10 < beta < 0.18) | 1 | 126 ms |
1001 | Automatically selected range 1 (0.16 < beta < 0.26) | 1 | 126 ms |
1010 | Automatically selected range 2 (0.24 < beta < 0.43) | 1 | 126 ms |
1011 | Automatically selected range 3 (0.35 < beta < 0.78) | 1 | 126 ms |
1100 | Automatically selected range 4 (0.64 < beta < 1.8) | 1 | 126 ms |
1101 | Automatically selected range 5 (1.4 < beta < 9) | 1 | 126 ms |
1110 | Automatically selected range 6 (6.7 < beta < 40) | 1 | 126 ms |
1111 | Automatically selected range 7 (beta > 27) | 1 | 126 ms |
1111 | Automatically detected diode connected sensor | 1.008 | 93 ms |
0000 | Manually selected range 0 (0.10 < beta < 0.5) | 1 | 93 ms |
0001 | Manually selected range 1 (0.13 < beta < 1) | 1 | 93 ms |
0010 | Manually selected range 2 (0.18 < beta < 2) | 1 | 93 ms |
0011 | Manually selected range 3 (0.3 < beta < 25) | 1 | 93 ms |
0100 | Manually selected range 4 (0.5 < beta < 50) | 1 | 93 ms |
0101 | Manually selected range 5 (1.1 < beta < 100) | 1 | 93 ms |
0110 | Manually selected range 6 (2.4 < beta < 150) | 1 | 93 ms |
0111 | Manually disabled beta correction | 1.008 | 93 ms |