SPRUJ55D September 2023 – July 2025 AM263P2 , AM263P2-Q1 , AM263P4 , AM263P4-Q1
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 7-128.
Figure 7-128 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 |
| TOP_CTRL. adc5adc6_OSD_CTRL | Function | Drive Impedance | 5K Voltage | 7K Voltage |
|---|---|---|---|---|
| 0 | Zero Scale | 5K || 7K | GND | GND |
| 1 | Zero Scale | 5K | GND | Open |
| 2 | Zero Scale | 7K | Open | GND |
| 3 | Full Scale | 5K || 7K | 3.3V VDD | 3.3V VDD |
| 4 | Full Scale | 5K | 3.3V VDD | Open |
| 5 | Full Scale | 7K | Open | 3.3V VDD |
| 6 | 5/12 Scale | 5K || 7K | GND | 3.3V VDD |
| 7 | 7/12 Scale | 5K || 7K | 3.3V VDD | GND |
| adc5adc6_osd_ctrl_1p1v[7:0] (Channel Enable) | |||||||
|---|---|---|---|---|---|---|---|
| Bit 0 | Bit 1 | Bit 2 | Bit 3 | Bit 4 | Bit 5 | Bit 6 | Bit 7 |
| ADC_R0_CH3 | ADC_R0_CH2 | ADC_R0_CH1 | ADC_R0_CH0 | ADC_R1_CH0 | ADC_R1_CH1 | ADC_R1_CH2 | ADC_R1_CH3 |
| Enabled if 1 | Enabled if 1 | Enabled if 1 | Enabled if 1 | Enabled if 1 | Enabled if 1 | Enabled if 1 | Enabled if 1 |