SLDS204B October 2014 – June 2020 PGA300
PRODUCTION DATA.
The PGA300 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 monitoring is accomplished by comparing the voltages at the INP+ and INP– pins with the overvoltage (INP_OV) and undervoltage (INP_UV) thresholds specified in the Electrical Characteristics: Diagnostics table.
Bridge-sensor connectivity faults are detected through the use of internal pulldown resistors. The value of the pulldown resistors and the threshold is configured through the PD[1:0] and THRS[2:0] bits in the AFEDIAG_CFG register.
The device also includes an overvoltage monitor at the INT+ and INT– pins through the use of 1-MΩ pullup resistors.
The pullup and pulldown resistors can be disconnected through the DIS_R_P and DIS_R_T bits in the AFEDIAG_CFG register.