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7.3.2 Analog-to-Digital Converter (ADC) Overview

The AFEx8101 feature a monitoring system centered on a 12-bit successive approximation register (SAR) ADC

and a highly flexible analog multiplexer. The monitoring system is capable of sensing up to two external inputs,

as well as several internal device signals.

The ADC uses the VREFIO pin voltage as a reference. The ADC timing signals are derived from an on-chip

oscillator. The conversion results are accessed through the device serial interface.

7.3.2.1 ADC Operation

The device ADC supports direct-mode and auto-mode conversions. Both conversion modes use a custom

channel sequencer to determine which of the input channels are converted by the ADC. The sequence order

is fixed. The user selects the start channel and stop channel of the conversion sequence. The conversion

method and channel sequence are specified in the ADC Configuration registers. The default conversion method

is auto-mode. Figure 7-8 shows the ADC conversion sequence.

START

Set ADC_CFG.BUF_PD = 0,

ADC_CFG.DIRECT_MODE = 0 or 1

TRIGGER.ADC =1?

Yes

Set ADC mux to

ADC_INDEX_CFG.

START

Convert ADC

ADC idle state

Increment ADC custom

channel sequencer

ADC_CFG.

DIRECT_MODE =1?

TRIGGER_ADC = 0?

Yes

ADC_INDEX.STOP

(last conversion

Completed)?

Yes

Figure 7-8. ADC Conversion Sequence

AFE78101, AFE88101

SLASF21 – DECEMBER 2022

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MSP430 Datasheet(PDF) 30 Page - Texas Instruments