AMC7891 Datasheet, PDF (15/41 Pages) Texas Instruments – Analog Monitor and Control Circuit with 10-Bit, Multi-Channel ADC and Four DACs, Temperature Sensor, and 12 GPIOs

AMC7891
www.ti.com
SBAS518A – AUGUST 2011 – REVISED DECEMBER 2011
The serial clock can be continuous or gated as long as there are exactly 24 falling clock edges within the frame.
A write command issued in frames whose width is not 24 bits is incorrect and ignored by the AMC7891. A read
command frame not equal to 24 bits may result in abnormal data on SDO and must be ignored by the host
processor. In order for another serial transfer to occur, CS must be brought low again to start a new cycle.
Figure 24 and Figure 25 show multiple write and read operations.
CS
SDI
W0
W1
W2
W3
SDO
XX
XX
XX
XX
Wn = Write Command for Register N
XX = Don’t care, undefined
Figure 24. Serial Interface Write Operation
CS
SDI
R0
R1
R2
R3
Any Command
SDO
XX
D0
D1
D2
D3
Rn = Read Command for Register N
Dn = Data from Register N
XX = Don’t care, undefined
Figure 25. Serial Interface Read Operation
Copyright © 2011, Texas Instruments Incorporated
Product Folder Link(s): AMC7891
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