Serial port, Figure 1, Figure 2 illustrates the i – Cirrus Logic CS5529 User Manual

Page 11: Khz, see figure 2), Cs5529, Φ fine, V≤ 25mv i = fv c, Φ coarse

CS5529

DS246F5

ages. The differential voltage between VREF+ and
VREF- sets the nominal full scale input span of the
converter. For a single-ended reference voltage,
such as the LT1019-2.5, the reference output is
connected to the VREF+ pin of the CS5529 and the
ground reference for the LT1019-2.5 is connected
to the VREF- pin.

Serial Port

The CS5529 includes a microcontroller with a
command register, a configuration register, a con-
version data register (read only), and a gain and off-
set register for calibration. All registers, except the
8-bit command register, are 24-bits in length. Fig-

ure 3 illustrates a block diagram of all the internal
register.

After a system initialization or reset, the serial port
is set to the command mode. The converter stays in
this mode until a valid 8-bit command is received
(the first 8-bits into the serial port). Once a valid 8-
bit command is received and interpreted by the
ADC’s command register, the serial port enters the
data mode. In data mode the next 24 serial clock
pulses shift data either into or out of the serial port
(72 serial clock pulses are needed if the setup reg-
ister command is issued). The Command Register
Descriptions section illustrates all valid com-
mands.

AIN

C = 20pF

f = 32.768 kHz

φ Coarse

φ Fine

≤ 25mV

i = fV C

Figure 1. Input models for AIN+ and AIN- pins.

VREF

C = 10pF

f = 32.768 kHz

φ Fine

≤ 25mV

i = fV C

φ Coarse

Figure 2. Input model for VREF+ and VREF- pins.

Latch Outputs
Low Power Mode
Output Word Rates
Unipolar/Bipolar
Reset System
etc.