CS5463

DS678PP1

23

5.15 Commands

All commands are 8-bits in length. Any byte that is not listed in this section is invalid. Commands that write to regis-

ters must be followed by 3 bytes of data. Commands that read data can be chained with other commands (e.g., while

reading data, a new command can be sent which can execute during the original read). All commands except reg-

ister reads, register writes, and SYNC0 & SYNC1 will abort any currently executing commands.

5.15.1 Start Conversions

Initiates acquiring measurements and calculating results. The device has two modes of acquisition.

C3

Modes of acquisition/measurement

0 = Perform a single computation cycle

1 = Perform continuous computation cycles

5.15.2 SYNC0 and SYNC1

The serial port can be initialized by asserting CS or by sending three or more consecutive SYNC1 commands fol-

lowed by a SYNC0 command. The SYNC0 or SYNC1 can also be sent while sending data out.

SYNC

0 = Last byte of a serial port re-initialization sequence.

1 = Used during reads and serial port initialization.

5.15.3 Power-up/Halt

If the device is powered-down, Power-Up/Halt will initiate a power on reset. If the part is already powered-on, all

computations will be halted.

5.15.4 Power-down and Software Reset

To conserve power the CS5463 has two power-down states. In stand-by state all circuitry, except the analog/digital

clock generators, is turned off. In the sleep state all circuitry, except the command decoder, is turned off. Bringing

the CS5463 out of sleep state requires more time than out of stand-by state, because of the extra time needed to

re-start and re-stabilize the analog oscillator.

S[1:0]

Power-down state

00 = Software Reset

01 = Halt and enter stand-by power saving state. This state allows quick power-on

10 = Halt and enter sleep power saving state.

11 = Reserved

B7

B6

B5

B4

B3

B2

B1

B0

1110

C3

000

B7

B6

B5

B4

B3

B2

B1

B0

1111111

SYNC

B7

B6

B5

B4

B3

B2

B1

B0

10100000

B7

B6

B5

B4

B3

B2

B1

B0

100

S1

S0

000