CS5524-AS Cirrus Logic Inc, CS5524-AS Datasheet - Page 18

• 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

2.2.1 System Initialization
When power to the CS5521/22/23/24/28 is applied,
the chips are held in a reset condition until the
32.768 kHz oscillator has started and a counter-
timer elapses. Due to the high Q of the 32.768 kHz
crystal, the oscillator takes 400-600 ms to start. The
counter-timer counts 2006 oscillator clock cycles
to make sure the oscillator is fully stable. During
this time-out period the serial port logic is reset and
the RV (Reset Valid) bit in the configuration regis-
ter is set to indicate that a valid reset occurred. Af-
ter a reset, the on-chip registers are initialized to the
following states and the converter is placed in the
command mode where it waits for a valid com-
mand.
18
configuration register:
offset registers:
gain registers:
channel setup registers:
000040(H)
000000(H)
400000(H)
000000(H)
Note: A system reset can be initiated at any time by writing
2.2.2 Serial Port Initialization Sequence
The serial port is initialized to the command mode
whenever a power-on reset is performed inside the
converter, or when the user transmits the port ini-
tialization sequence. The port initialization se-
quence involves clocking 15 bytes of all 1’s,
followed by one byte with the following bit con-
tents ‘11111110’. This sequence places the chip in
the command mode where it waits for a valid com-
mand to be written.
a logic 1 to the RS (Reset System) bit in the configura-
tion register. After a reset, the RV bit is set until the
configuration register is read. The user must then
write a logic 0 to the RS bit to take the part out of the
reset mode. Any other bits written to the configuration
register at this time will be lost. The configuration reg-
ister must be written again once RS = 0 to set any other
bits.
CS5521/22/23/24/28
DS317F2