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CS5550 Datasheet

  • CS5550

  • Two-channel, Low-cost A/D Converter

  • 536.00KB

  • 25页

  • CIRRUS

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CS5550
as well as the other defined power states of the
CS5550, are described in Section 4.6).
Refer to Section 5 of the data sheet to see the de-
fault register values for any particular device regis-
ter.
SYNC1 command bytes (0xFF) followed by
one SYNC0 command byte (0xFE).
4.6 CS5550 Power States
Active state
denotes the operation of CS5550
when the device is fully powered on (not in
sleep
state or
stand-by
state). Performing either of the
following actions will insure that the CS5550 is op-
erating in the
active
state:
1) Power on the CS5550. (Or if the device is al-
ready powered on, recycle the power.)
2) Software Reset
3) Hardware Reset
In addition to the actions listed above, note that if
the device is in
sleep
state or in
stand-by
state, the
action of waking up the device out of
sleep
state or
stand-by
state (by issuing the Power-Up/Halt com-
mand) will also insure that the device is set into
ac-
tive
state. In order to send the Power-Up/Halt
command to the device, the serial port must be ini-
tialized. Therefore, after applying power to the
CS5550, a hardware reset should always be per-
formed.
4.5 Serial Port Initialization
It is possible for the serial interface to become un-
synchronized, with respect to the SCLK input. If
this occurs, any attempt to clock valid CS5550
commands into the serial interface will result in ei-
ther no operation or unexpected operation, be-
cause the CS5550 will not interpret the input
command bits correctly. The CS5550鈥檚 serial port
must then be re-initialized. To initialize the serial
port, any of the following actions can be performed:
1) Drive (assert) the CS pin low [or if CS pin is al-
ready low, drive the pin high, then back to low].
2) Hardware Reset (drive RESET pin low, for at
least 10
碌
s, then drive back to high).
3) Issue the
Serial Port Initialization Sequence,
which is performed by clocking 3 (or more)
DS630F1
19

CS5550 PDF文件相关型号

CS5550-IS,CS5550-ISZ

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