SPRUJ17H March 2022 – October 2024 AM2631 , AM2631-Q1 , AM2632 , AM2632-Q1 , AM2634 , AM2634-Q1
POK modules are responsible for accurately detecting the voltage levels. Each module is trimmed to account for process and temperature variations. The trim values are provided by eFuse chains enabled by a POR module.
The table below shows the different voltage monitors available. Enabling/Disabling of this monitors can be controlled by the TOP_CTRL.VMON_CTRL and TOP_CTRL.ADC_REF_COMP_CTRL registers. There are corresponding status bits available in TOP_CTRL.VMON_STAT and TOP_CTRL:ADC_REF_GOOD_STATUS. The output of voltage monitors are filtered using a configurable digital glitch filter module. The configuration of the glitch filter can be done using the TOP_CTRL.VMON_FILTER_CTRL.SELECT_VALUE register to select from no filtering to a maximum of 14.4μs filtering of voltage monitor signals. The output of the voltage monitors are aggregated and the aggregated output is forwarded to the ESM. Individual mask bits in TOP_CTRL.MASK_VMON_ERROR_ESM_L and TOP_CTRL.MASK_VMON_ERROR_ESM_H can be used to MASK the corresponding monitor to trigger ESM event.
The POK bit is set to 1 when the voltage supply is within range and to 0 when out of range. See the device datasheet for POK tolerance details. The ESM event is generated only when POK signals are out of range.
Voltage Monitored | Comparator block | UV/OV(1) | Description |
---|---|---|---|
VDDA18 | C0 | UV | Voltage monitor for 1.8-V LDO output using 3.3-V as reference |
VDDA18 | C2 | UV/OV | Voltage monitor for 1.8-V LDO output using BGAP as reference |
VBGAP09 | C1 | UV/OV | Voltage monitor for 0.9-V bandgap. |
VDD12 | C3 | UV/OV | Voltage monitor for 1.2-V I/O supply |
VDDSBIO | C5 | UV/OV | Voltage monitor for 1.8-V IO bias supply |
VSYS_MON | C7 | UV | Voltage monitor for external VSYS_MON |
VDDA33 | C8 | UV | Voltage monitor for 3.3-V I/O supply |
ADC0_REF | C4 | UV/OV | Voltage monitor for ADC0_REF |
ADC12_REF | C9 | UV/OV | Voltage monitor for ADC12_REF |
ADC34_REF | C6 | UV/OV | Voltage monitor for ADC34_REF |
See below table for a list of the supplies and where they are monitored:
Supply | External Reset | Internal Reset | Safety System |
---|---|---|---|
VDDA33 | Y | N | Y |
VDDA18 | N | Y | Y |
VBGAP09 | N | Y | Y |
VDD12 | Y | Y | Y |
VDDSBIO | N | N | Y |
VOUT_LDO* | N | Y* | N |
VSYS_MON | Y | N | Y |
ADC0_REF, ADC12_REF | N | N | Y |
ADC34_REF | N | N | Y |
*:LDO output has monitoring in addition to the monitoring on VDDA18.