AMC7812SPAPR Datasheet, PDF (31/92 Pages) Texas Instruments – 12-Bit Analog Monitoring and Control Solution with Multichannel ADC, DACs, and Temperature Sensors

AMC7812
www.ti.com
SBAS513E – JANUARY 2011 – REVISED SEPTEMBER 2013
When any of following events occur, the current conversion cycle stops immediately:
• A new trigger is issued.
• The conversion mode changes.
• Either ADC channel register is rewritten.
• Any of the analog input threshold registers is 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 sixteen, 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 is completed, 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, all ADC-n-Data Registers are not
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
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