CS5464-IS View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
CS5464-IS Datasheet PDF : 46 Pages
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CS5464
5.15 Commands
All commands are 8 bits in length. Any command byte value that is not listed in this section is invalid. Commands
that write to registers must be followed by 3 bytes of data. Commands that read data can be chained with other com-
mands (e.g., while reading data, a new command can be sent which can execute during the original read). All com-
mands except register 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 is resynchronized to byte boundaries by sending three or more consecutive SYNC1 commands fol-
lowed by a SYNC0 command. The SYNC0 or SYNC1 commands can also be used as a NOP command.
SYNC
Designates calibration
0 = This command is the end of the serial port re-initialization sequence.
1 = This command is part of the serial port re-initialization sequence.
5.15.3 Power-down, Power-up, Halt and Software Reset
B7 B6 B5 B4 B3 B2 B1 B0
1
0
S1 S0
0
0
0
0
To conserve power the CS5464 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 digital clock generator and the command
decoder, is turned off. Bringing the CS5464 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 clock signal. If the device is powered-down, Pow-
er-Up/Halt will initiate a power on reset. If the part is already powered-on, all computations will be halted.
S[1:0]
Power-down state
00 = Software Reset
01 = Halt and enter sleep power saving state. This state requires a slow power-on time
10 = Power-up and Halt
11 = Halt and enter stand-by power saving state. This state allows quick power-on time
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DS682PP1
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