The IWRL6432AOP device
includes provision for an ADC service for user application, where the GPADC engine
present inside the device can be used to measure up to two external voltages. The
GPADC1
is used for this
purpose.
- GPADC itself is controlled by TI
firmware running inside the FEC sub-system and access to it for customer’s
external voltage monitoring purpose is via ‘APPSS’ calls routed to the FEC
subsystem. This API could be linked with the user application running on APPSS
Cortex
M4F®.
- Device Firmware package (DFP)
provides APIs to configure and measure these signals. The API allows configuring
the settling time (number of ADC samples to skip) and number of consecutive
samples to take. At the end of a frame, the minimum, maximum and average of the
readings will be reported for each of the monitored voltages.
GPADC structures are used for
measuring the output of internal temperature sensors. The accuracy of these
measurements is ±7°C.