CS5376 View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
CS5376 Datasheet PDF : 122 Pages
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CS5376
MDI Input
512 kHz
SINC
Filter
4
Gain
Correction 4
Offset
Correction 4
Offset
Calibration 4
FIR
Filters
IIR
Filter
Output to High Speed Serial Data Port (SD Port)
Output Rate 62.5 Hz ~ 4 kHz
Figure 41. Gain and Offset Correction
9. GAIN AND OFFSET CORRECTION
The CS5376 can apply gain and offset corrections
to the digitally filtered data in each measurement
channel. Gain correction uses scaling values writ-
ten to the GAIN registers (0x21-0x24), while offset
correction uses values written to the OFFSET reg-
isters (0x25-0x28).
In addition to the gain and offset corrections, an
offset calibration algorithm is included in the
CS5376 that automatically calculates offset correc-
tion values for each channel and writes them into
the OFFSET registers.
9.1 Gain Correction
Gain correction in the CS5376 is used to normalize
sensor gain across multi-sensor networks. It re-
quires externally calculated scale values to be writ-
ten into the GAIN1, GAIN2, GAIN3, and GAIN4
registers.
Gain correction values are 24-bit 2’s complement
values with unity gain defined as full scale,
0x7FFFFF (decimal 8388607). Gain correction is
always a fractional multiplication, and can never
gain the digital filter data greater than one.
Output Value = Data * (GAIN / 0x7FFFFF)
Unity Gain: GAIN = 0x7FFFFF
50% Gain: GAIN = 0x3FFFFF
Zero Gain: GAIN = 0x000000
Once the GAIN registers are written, the USEGR
bit (bit 12) in the FILT_CFG register enables gain
correction.
9.1.1 Gain Register Calculation
The calculation of gain correction values is made
externally to the CS5376, and the results written
into the GAIN registers. Calculated gain correction
values depend on two factors; the minimum gain of
all sensors in the measurement network, and the
relative gain of individual sensors to that minimum
gain.
The relative gain of each sensor is determined by
applying a standardized input signal and measuring
DS256PP1
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