AMC7834 Datasheet, PDF (51/93 Pages) Texas Instruments – AMC7834 12-Bit Integrated Power-Amplifier Monitor and Control System with Temperature, Current and Voltage Supervision Capabilities

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AMC7834
SLAS972B – NOVEMBER 2014 – REVISED MARCH 2016
7.5 Programming
The AMC7834 device is controlled through a flexible four-wire serial interface that is compatible with SPI-type
interfaces used on many microcontrollers and DSP controllers. The interface provides read and write (R/W)
access to all registers of the AMC7834 device.
Each serial-interface access cycle is exactly 24 bits long. A frame is initiated by asserting the CS pin low. The
frame ends when the CS pin is deasserted high. The first bit transferred is the R/W bit. The next 7 bits are the
register address (128 addressable registers), and the remaining 16 bits are data. For all writes, data is clocked in
on the rising edge of SCLK. If the write access is not equal to 24 clocks, the data bits are not committed. On a
read access, data is clocked out on the falling edge of the serial interface clock, SCLK, on the SDO pin.
Figure 65 and Figure 66 show the access protocol used by the interface. Data is accepted as MSB first.
CS
SCLK
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
SDI R/W A6 A5 A4 A3 A2 A1 A0 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
SDO
Figure 65. Serial Interface Write Bus Cycle
CS
SCLK
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
SDI
R/W A6 A5 A4 A3 A2 A1 A0
SDO
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Figure 66. Serial Interface Read Bus Cycle
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