44.6.5 OPAxCON4
Important:
Operational Amplifier Control Register 3- The OFCST
bit is only accessible to the user when the OPA module is in automatic input
offset voltage calibration mode (OFCSEL
=
‘b10). - It is recommended to perform
the calibration sequence at least once after selecting the automatic input
offset voltage calibration result as the OPA offset source (OFCSEL
=
‘b10).
| Name: | OPAxCON4 |
| Address: | 0x123,0x12B |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| PTRES | OFCST | OFCSEL[1:0] | |||||||
| Access | R/W | R/HC | R/W | R/W | |||||
| Reset | 0 | 0 | 0 | 0 | |||||
Bit 4 – PTRES Peak/Trough Detect Reset
| Value | Description |
|---|---|
| 1 | Initiate peak/trough detect Reset |
| 0 | No Reset of peak/trough detect is initiated |
Bit 2 – OFCST Automatic Input Offset Voltage Calibration Start(1,2)
| Value | Description |
|---|---|
| 1 | Automatic input offset voltage calibration is started or in progress |
| 0 | Automatic input offset voltage calibration is complete or not in progress |
Bits 1:0 – OFCSEL[1:0] Input Offset Voltage Source Selection
| Value | Description |
|---|---|
| 11 | Reserved |
| 10 | Result of automatic input offset voltage calibration sequence is used as input offset voltage source |
| 01 | Value written to the OPAxOFFSET register is used as input offset voltage source |
| 00 | Factory calibrated input offset voltage value in the OPAxOFFSET register is used as input offset voltage source |