CS5524-AS Cirrus Logic Inc, CS5524-AS Datasheet - Page 17

• Manufacturer Part Number: CS5524-AS
• Description: A/D Converter (A-D) IC
• Manufacturer: Cirrus Logic Inc

Specifications of CS5524-AS

• Sample Rate: 606SPS
• Input Channels Per Adc: 4
• Mounting Type: Surface Mount
• No. Of Channels: 4
• Power Rating: 9mW
• Peak Reflow Compatible (260 C): No
• Supply Voltage Max: 5.25V
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

A group of registers, called Channel Set-up Regis-
ters, are also included in the converters. These reg-
isters are used to hold pre-loaded conversion
instructions. Each channel set-up register is 24 bits
long and holds two 12-bit conversion instructions
(Setups). Upon power up, these registers can be ini-
tialized by the users’ microcontroller with conver-
sion instructions. The user can then use bits in the
configuration register to choose a conversion
mode.
Several conversion modes are possible. Using the
single conversion mode, an 8-bit command word
can be written into the serial port. The command in-
cludes pointer bits which ‘point’ to a 12-bit com-
mand in one of the Channel Setup Registers which
is to be executed. The 12-bit commands can be set-
up to perform a conversion on any of the input
channels of the converter. More than one of the 12-
bit Setups can be used for the same analog input
channel. This allows the user to convert on the
same signal with either a different conversion
speed, a different gain range, or any of the other op-
tions available in the Setup Register. The user can
DS317F2
AIN1
AIN2
AIN3
AIN4
Chop Frequency
Multiple Conversions
Depth Pointer
Loop
Read Convert
Powerdown Modes
Flags
Etc.
4 (24)
Off 1
Off 2
Off 3
Off 4
Configuration
Figure 9. CS5523/24 Register Diagram
1 x 24
Gain 1
Gain 2
Gain 3
Gain 4
4 (24)
set up the registers to perform different conversion
conditions on each of the input channels.
The ADCs also include multiple channel conver-
sion capability. User bits in the configuration regis-
ter of the ADCs can be configured to sequence
through the 12-bit command Setups, performing a
conversion according to the content of each 12-bit
Setup. This channel scanning capability can be
configured to run continuously, or to scan through
a specified number of Setup Registers and stop un-
til commanded to continue. In the multiple channel
scanning modes, the conversion data words are
loaded into an on-chip data FIFO. The converter is-
sues a flag on the SDO pin when a scan cycle is
completed so the user can read the FIFO. More de-
tails are given in the following pages.
Instructions are provided to initialize the converter,
perform offset and gain calibrations, and how to
configure the converter for the various conversion
modes. Each of the bits of the configuration regis-
ter and of the Channel Setup Registers is described.
A list of examples follows the description section.
Table 2 can be used to decode all valid commands
(the first 8-bits into the serial port).
Setup 1
Setup 3
Setup 5
Setup 7
4 (12 x 2)
Latch Outputs
Channel Select
Output Word Rate
PGA Selection
Unipolar/Bipolar
Setup 2
Setup 4
Setup 6
Setup 8
CS5521/22/23/24/28
8 x 24
DATA
FIFO
SDO
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