SPRUJB6B November 2024 – May 2025 AM2612
The opens/shorts detection circuit (OSDETECT) can be used to detect pin faults in the system. The circuit connects to the ADC input after the channel select multiplexer but before the S+H circuit as shown in Figure 7-154.
Figure 7-154 Opens/Shorts Detection Circuit
The circuit can be operated by writing a value to the DETECTCFG field in the ADCOSDETECT register. This causes the circuit to source a voltage onto the input during the S+H phase of any conversion. The voltage and drive strength of the OSDETECT circuit for different DETECTCFG settings is given in .
| TOP_CTRL. ADCx_OSD_CHEN | TOP_CTRL. ADCx_OSD_CTRL | Function | Drive Impedance | 5K Voltage | 7K Voltage |
|---|---|---|---|---|---|
| 0 | 0 | Off | Open | Open | Open |
| 1 | 0 | Zero Scale | 5K || 7K | GND | GND |
| 1 | 1 | Zero Scale | 5K | GND | Open |
| 1 | 2 | Zero Scale | 7K | Open | GND |
| 1 | 3 | Full Scale | 5K || 7K | 3.3V VDD | 3.3V VDD |
| 1 | 4 | Full Scale | 5K | 3.3V VDD | Open |
| 1 | 5 | Full Scale | 7K | Open | 3.3V VDD |
| 1 | 6 | 5/12 Scale | 5K || 7K | GND | 3.3V VDD |
| 1 | 7 | 7/12 Scale | 5K || 7K | 3.3V VDD | GND |