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ADC Configuration Examples
The maximum number of conversions is set to 5 and the sequence select register is set as shown in the
following table Note for convenience, I1, I2, ...etc are used to represent the sequence select value.
SEQCHSEL0
SEQCHSEL1
SEQCHSEL2
SEQCHSEL3
Once reset and initialized, the sequencer waits for an external trigger. At the 1st trigger, six conversions
(sequence select values of SEQ00(I
performed. At the end of the auto-conversion session, the ADC result registers have the following values:
Note at this point, the sequencer remains at its current state waiting for another trigger.
8.16.5 Start/Stop Operation (External Trigger)
Here the sequencer is synchronized to the start of an external trigger. At the end of the conversion
sequence, when the maximum number of conversions has occurred, the sequencer performs only a single
sweep of conversions.
Requirement: Automatically convert 4 voltages (V1/V2/V3/V4) every 100us synchronized to an external
trigger. In this example, the maximum number of conversions is set to 3 and the sequence select registers
are set as follows:
SEQCHSEL0
SEQCHSEL1
314
ADC12 Overview
Bits
4:0
9:5
14:10
Bits
4:0
9:5
14:10
Bits
4:0
9:5
14:10
Bits
4:0
9:5
14:10
), SEQ01(I
1
Buffer Registers
RESULT-00
RESULT-01
RESULT-02
RESULT-03
RESULT-04
RESULT-05
Bits
4:0
9:5
14:10
Bits
4:0
9:5
14:10
Copyright © 2016, Texas Instruments Incorporated
Field Name
SEQ00
SEQ01
SEQ02
Field Name
SEQ03
SEQ04
SEQ05
Field Name
SEQ06
SEQ07
SEQ08
Field Name
SEQ09
SEQ10
SEQ11
), SEQ02(I
), SEQ03(I
), SEQ04(I
2
3
4
ADC Conversion Result
I
1
I
2
I
3
I
4
I
5
I
6
Field Name
SEQ00
SEQ01
SEQ02
Field Name
SEQ03
SEQ04
SEQ05
SNIU028A – February 2016 – Revised April 2016
www.ti.com
Channel Select Value
I
1
I
2
I
3
Channel Select Value
I
4
I
5
I
6
Channel Select Value
X
X
X
Channel Select Value
X
X
X
) and SEQ05(I
)) are
5
6
Channel Select Value
V
1
V
2
V
3
Channel Select Value
V
4
X
X
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