AMC7891_15 Datasheet, PDF (24/41 Pages) Texas Instruments – Analog Monitor and Control Circuit with 10-Bit, Multi-Channel ADC and Four DACs, Temperature Sensor, and 12 GPIOs

AMC7891
SBAS518A – AUGUST 2011 – REVISED DECEMBER 2011
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CONVERSION MODES
Two types of ADC conversions are available: direct-mode and auto-mode. adc_mode bit (AMC_config register,
bit 13) sets the conversion mode. The default conversion mode is auto-mode (adc_mode = '1').
In direct-mode conversion, each analog channel within the specified group in register ADC_enable is converted a
single time. After the last channel is converted, the ADC goes into an idle state and waits for a new trigger.
Auto-mode conversion, on the other hand, is a continuous operation. In auto-mode, each analog channel within
the specified group is converted sequentially and repeatedly.
The flow chart of the ADC conversion sequence in Figure 27 shows the conversion process.
Start
(Reset)
Wait for
ADC Trigger
First Conversion
New Trigger
Yes
or
adc_mode Changed?
No
Yes
Stop current conversion
Input Channel
Register been
Rewritten?
No
Yes
Is this the last conversion?
Yes
Direct Mode
No
Convert next channel
No
Figure 27. ADC Conversion Sequence
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