JAJSG16 August 2018 PGA305
PRODUCTION DATA.
The PGA305 device includes circuits to monitor for sensor connectivity faults. Specifically, the device monitors the bridge sensor pins for opens (including loss of connection from the sensor), short to ground, and short-to-sensor supply. The device can compare the voltage at INP+ and INP– pins with the overvoltage and undervoltage thresholds listed in the Electrical Characteristics – Diagnostics table as a way to monitor for sensor connectivity faults.
The device also includes an overvoltage monitor at the INT+ and INT– pins through the use of 1-MΩ pullup resistors.
Figure 22 shows the block diagram of the P gain and T gain input faults.
The bridge-sensor connectivity faults are detected through the use of an internal pulldown resistor. The value of the pulldown resistor and the threshold can be configured using the AFEDIAG_CFG EEPROM register. Table 11 describes the possible configurations.
BITS | DESCRIPTION | ||||
---|---|---|---|---|---|
0: PD1
1: PD2 |
See Electrical Characteristics – Diagnostics. | ||||
2: THRS[0]
3: THRS[1] 4: THRS[2] |
See Electrical Characteristics – Diagnostics. | ||||
5: DIS_R_P | 1: Disables pulldown resistors used for open and short diagnostics on the INP+ and INP– pins
0: Enables pulldown resistors used for open and short diagnostics on the INP+ and INP– pins |
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6: DIS_R_T | 1: Disables pullup resistors used for open and short diagnostics on the INT+ and INT– pins
0: Enables pullup resistors used for open and short diagnostics on the INT+ and INT– pins |
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7: | — |