Cirrus Logic CS5378 - Manual (Page 6)

CS5378
DS639F3 6
1. GENERAL DESCRIPTION
The CS5378 is a single channel digital filter with
integrated system peripherals. Figure 1 illustrates a
simplified block diagram of the CS5378.
1.1 Digital Filter Features
• Single channel decimation filter for CS5373A
ΔΣ modulator.
• Synchronous operation for simultaneous sam-
pling in multi-sensor systems.
- Internal synchronization of digital filter
phase to an external SYNC signal.
• Output word rates, including low bandwidth
rates.
- Standard output rates: 4000, 2000, 1000,
500, 333, 250 SPS.
- Low bandwidth rates: 200, 125, 100, 50,
40, 25, 20, 10, 5, 1 SPS.
• Flexible digital filter configuration. (See Figure
2)
- Cascaded SINC, FIR, and IIR filters with
selectable output stage.
- Linear and minimum phase FIR low-pass
filter coefficients included.
- 3 Hz Butterworth IIR high-pass filter coef-
ficients included.
- FIR and IIR coefficients programmable to
create a custom filter response.
• Digital gain correction to normalize sensor
gain.
• Digital offset correction and calibration.
- Offset correction to remove measurement
Serial Interface
Decimation and
Filtering Engine
Modulator Data Interface
Test Bit Stream
Controller
Reset, Synchronization
TBSDATA
Time Break Controller
GPIO
General Purpose I/O
SC
K
MO
S
I
V
D
DP
AD
VDD
P
L
L
V
D
DCORE
SYNC
MSYNC
TIMEB
GPIO5:PLL1
GPIO4:PLL0
GPIO3
GPIO2
GPIO1
GNDP
A
D
G
N
DCORE
GNDP
L
L
MDA
T
A
MFLA
G
GPIO0
GPIO6:PLL2
GPIO7:BOOT
DRDY MI
S
O
SS:
EECS
RESET
CLK
MCLK
PLL, Clock Generation
Figure 1. CS5378 Block Diagram