CS5463
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
B7
B6
B5
B4
B3
B2
B1
B0
1
1
1
0
C3
0
0
0
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
B7
B6
B5
B4
B3
B2
B1
B0
1
1
1
1
1
1
1
SYNC
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
B7
B6
B5
B4
B3
B2
B1
B0
1
0
1
0
0
0
0
0
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
B7
B6
B5
B4
B3
B2
B1
B0
1
0
0
S1
S0
0
0
0
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
DS678PP1
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