AMC7812B_15 Datasheet, PDF (32/92 Pages) Texas Instruments – 12-Bit Analog Monitoring and Control Solution with Multichannel ADC, DACs, and Temperature Sensors

AMC7812B
SBAS625A – SEPTEMBER 2013 – REVISED SEPTEMBER 2013
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The current conversion cycle stops immediately if:
• A new trigger is issued.
• The conversion mode changes.
• Either ADC channel register is rewritten.
• Any of the analog input threshold registers are rewritten.
When a new external or internal trigger activates, the ADC starts a new conversion cycle. The internal trigger
should not be issued at the same time the conversion mode is changed. If a '1' is simultaneously written to the
ICONV bit when changing the CMODE bit to '0' or '1', the current conversion stops and immediately returns to
the wait for ADC trigger state.
Double-Buffered ADC Data Registers
The host can access all 16, double-buffered ADC data registers, as shown in Figure 83. The conversion result
from the analog input with channel address n (where n = 0 to 15) is stored in the ADC-n-data register. When the
conversion of an individual channel completes, the data are immediately transferred into the corresponding ADC-
n temporary (TMPRY) register, the first stage of the data buffer. When the conversion of the last channel
completes, all data in the ADC-n TMPRY registers are simultaneously transferred into the corresponding ADC-n-
data registers, the second stage of the data buffer. However, if a data transfer is in progress between any ADC-
n-data register and the AMC shift register, no ADC-n-data registers are updated until the data transfer is
complete. The conversion result from channel address n is stored in the ADC-n-data register. For example, the
result from channel 0 is stored in the ADC-0-data register, and the result from channel 3 is stored in the ADC-3-
data register.
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
CH8
CH9
CH10
CH11
CH12
CH13
CH14
CH15
ADC
Input
Range
Selection
Out-of-Limit
Alarm
ADC-0
Temporary
ADC-0
Data
To Shift
Register
ADC-7
Temporary
ADC-7
Data
ICONV
(Internal
Trigger)
OR
CONVERT
(External Trigger)
ADC-15
Temporary
ADC-15
Data
DAVF Bit
DAV Pin
Figure 83. Double-Buffered ADC Structure
32
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