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 six external voltages. The
ADC1, ADC2, ADC3, ADC4, ADC5, and ADC6 pins are
used for this purpose.
- ADC itself is controlled by TI firmware running
inside the BIST subsystem and access to it for
customer’s external voltage monitoring purpose is
via ‘monitoring API’ calls routed to the BIST
subsystem. This API could be linked with the user
application running on MSS R4F.
- BIST subsystem firmware will internally schedule
these measurements along with other RF and Analog
monitoring operations. 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
- 625 Ksps SAR ADC
- 0 to 1.8V input range
- 10-bit resolution
5 out of the 6 inputs, an optional internal buffer
(0.4-1.4V input range) is available. Without the
buffer, the ADC has a switched capacitor input
load modeled with 5pF of sampling capacitance and
12pF parasitic capacitance (GPADC channel 6, the
internal buffer is not available).
GPADC structures are
used for measuring the output of internal
temperature sensors. The accuracy of these
measurements is ±7°C.
Figure 9-6 ADC