Cs5550, 2 offset registers, 3 gain registers – Cirrus Logic CS5550 User Manual
Page 21: 4 cycle count register
CS5550
DS630F1
21
5.2 Offset Registers
Address:
1 (Offset Register - AIN1)
3 (Offset Register - AIN2)
Default** = 0.000
The Offset Registers are initialized to zero on reset, allowing the device to function and perform measurements.
The register is loaded after one computation cycle with the offset when the proper input is applied and the Cal-
ibration Command is received. DRDY will be asserted at the end of the calibration. The register may be read
and stored so the register may be restored with the desired system offset compensation. The value is in the
range ± full scale. The numeric format of this register is two’s complement notation.
5.3 Gain Registers
Address:
2 (Gain Register - AIN1)
4 (Gain Register - AIN2)
Default** = 1.000
The Gain registers are initialized to 1.0 on reset, allowing the device to function and perform measurements.
The Gain registers hold the result of the gain calibrations. If a calibration is performed, the register is loaded after
one computation cycle with the system gain when the proper DC input is applied and the Calibration Command
is received. DRDY will be asserted at the end of the calibration. The register may be read and stored so the
register may be restored with the desired system offset compensation. The value is in the range 0.0
≤ Gain <
3.9999.
5.4 Cycle Count Register
Address: 5
Default** = 4000
The Cycle Count Register value (denoted as ‘N’) determines the length of one computation cycle. During con-
tinuous conversions, the computation cycle frequency is (MCLK/K)/(1024
∗N) where MCLK is master clock input
frequency (into XIN/XOUT pins), K is clock divider value (as specified in the Configuration Register), and N is
Cycle Count Register Value.
MSB
LSB
-(2
0
)
2
-1
2
-2
2
-3
2
-4
2
-5
2
-6
2
-7
.....
2
-17
2
-18
2
-19
2
-20
2
-21
2
-22
2
-23
MSB
LSB
2
1
2
0
2
-1
2
-2
2
-3
2
-4
2
-5
2
-6
.....
2
-16
2
-17
2
-18
2
-19
2
-20
2
-21
2
-22
MSB
LSB
2
23
2
22
2
21
2
20
2
19
2
18
2
17
2
16
.....
2
6
2
5
2
4
2
3
2
2
2
1
2
0