CS5460A datasheet(39/54 Pages) CIRRUS

39 / 54 page

CS5460A

DS487F4

4.1 Commands (Write Only)

All command words are 1 byte in length. Commands that write to a register must be followed by 3 bytes of register

data. Commands that read from registers initiate the output of 3 bytes of register data. Commands that read data

can be ‘chained’ with other commands (e.g., while reading data, a new command can be sent to SDI which can ex-

ecute before the original read is completed). This allows for ‘chaining’ commands.

4.1.1 Start Conversions

This command indicates to the state machine to begin acquiring measurements and calculating results. The device

has two modes of acquisition.

Modes of acquisition/measurement

0 = Perform a single computation cycle

1 = Perform continuous computation cycles

4.1.2 SYNC0 Command

This command is the end of the serial port re-initialization sequence. It can also be used as a NOP command. The

serial port is resynchronized to byte boundaries by sending three or more consecutive SYNC1 commands followed

by a SYNC0 command.

4.1.3 SYNC1 Command

This command is part of the serial port re-initialization sequence. It can also serve as a NOP command.

4.1.4 Power-Up/Halt

If the device is powered-down into either stand-by or sleep power saving mode (See 4.1.5), this command will pow-

er-up the device. After the CS5460A is initially powered-on, no conversions/computations will be running. If the de-

vice is already powered on and the device is running either ‘single computation cycle’ or ‘continuous computation

cycles’ data acquisition modes, all computations will be halted once this command is received.

110

111

010

CS5460A データシート(PDF) 39 Page - Cirrus Logic