CS5461-IS 查看數據表（PDF） - Cirrus Logic

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CS5461-IS

Single Phase Bi-Directional Power/Energy IC

Cirrus Logic 

CS5461

6. SERIAL PORT OVERVIEW

The CS5461's serial port incorporates a state ma-

chine with transmit/receive buffers. The state ma-

chine interprets 8 bit command words on the rising

edge of SCLK. Upon decoding of the command

word, the state machine performs the requested

command or prepares for a data transfer of the ad-

dressed register. Request for a read requires an in-

ternal register transfer to the transmit buffer, while

a write waits until the completion of 24 SCLKs be-

fore performing a transfer. The internal registers

are used to control the ADC's functions. All regis-

ters are 24-bits in length.

The CS5461 is initialized and fully operational in

its active state upon power-on. After a power-on,

the device will wait to receive a valid command

(the first 8-bits clocked into the serial port). Upon

receiving and decoding a valid command word, the

state machine instructs the converter to either per-

form a system operation, or transfer data to or from

an internal register.

6.1 Commands

All command words are 1 byte in length. Any 8-bit word that is not listed in this section is considered an invalid com-

mand word. Commands that write to a register must be followed by 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

execute before the original read is completed).

6.1.1 Start Conversions

B7 B6 B5 B4 B3 B2 B1 B0

1

1

1

0

C

0

0

0

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

has two modes of acquisition.

C = Modes of acquisition/measurement

0 = Perform a single computation cycle

1 = Perform continuous computation cycles

6.1.2 SYNC0 Command

B7 B6 B5 B4 B3 B2 B1 B0

1

1

1

1

1

1

1

0

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

command. The serial port is resynchronized to byte boundaries by sending three or more consecutive SYNC1 com-

mands followed by a SYNC0 command.

6.1.3 SYNC1 Command

B7 B6 B5 B4 B3 B2 B1 B0

1

1

1

1

1

1

1

1

This command is part of the serial port re-initialization sequence. The command also serves as a NOP command.

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DS546F2

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