AMC7812B Datasheet, PDF (57/92 Pages) TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS – 12-Bit Analog Monitoring and Control Solution with Multichannel ADC, DACs, and Temperature Sensors

AMC7812B
www.ti.com
SBAS625A – SEPTEMBER 2013 – REVISED SEPTEMBER 2013
Standalone Operation
In standalone mode, as shown in Figure 105, each device has its own SPI bus. The serial clock can be
continuous or gated. The first CS falling edge starts the operation cycle. Exactly 24 falling clock edges must be
applied before CS is brought high again. If CS is brought high before the 24th falling SCLK edge, or if more than
24 SCLK falling edges are applied before CS is brought high, then the input data are incorrect. The device input
register is updated from the shift register on the CS rising edge, and data are automatically transferred to the
addressed registers as well. In order for another serial transfer to occur, CS must be brought low again.
Figure 106 and Figure 107 show write and read operations in standalone mode.
Figure 105. Standalone Operation
CS
SDI
W0
W1
W2
W3
SDO
XX
XX
XX
XX
Wn = Write Command for Register N
XX = Don’t care, undefined
Figure 106. Write Operation in Standalone Mode
CS
SDI
R0
R1
R2
R3
SDO
XX
D0
D1
D2
Rn = Read Command for Register N
Dn = Data from Register N
XX = Don’t care, undefined
Figure 107. Read Operation in Standalone Mode
Any Command
D3
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