Cirrus Logic CS5378 - Manual (Page 28)

CS5378
DS639F3 28
Sample Command:
Write IIR1 coefficients 0x84BC9D, 0x7DA1B1,
0x825E4F, and IIR2 coefficients 0x83694F,
0x3CAD5F, 0x3E5104, 0x835DF8, 0x3E5104.
03
84 BC 9D 7D A1 B1 82 5E 4F 83 69 4F
3C AD 5F 3E 51 04 83 5D F8 3E 51 04
Write ROM Coefficients - 0x04
This EEPROM command selects the on-chip coef-
ficients for the FIR1, FIR2, IIR 1st order, and IIR
2nd order filters for use by the digital filter. One
data word is required to select which internal coef-
ficient sets to use. See “Filter Coefficient Selec-
tion” on page 38 for information about selecting
on-chip FIR and IIR coefficient sets.
Sample Command:
Select IIR1 and IIR2 3 Hz @ 500 SPS low-cut co-
efficients, with FIR1 and FIR2 linear phase high-
cut coefficients. Data word 0x002200.
04 00 22 00
Filter Start - 0x07
This EEPROM command initializes and starts the
digital filter. Measurement data becomes available
one full sample period after this command is is-
sued. No data words are required for this EE-
PROM command.
Sample Command:
07
Table 7. EEPROM Boot Configuration Commands
(DATA) indicates multiple words of this type are to be written.
Name CMD
8-bit
DATA
24-bit Description
NOP 00 - No Operation
WRITE DF REGISTER 01 REG
DATA
Write Digital Filter Register
WRITE FIR COEFFICIENTS 02 NUM FIR1
NUM FIR2
(FIR COEF)
Write Custom FIR Coefficients
WRITE IIR COEFFICIENTS 03 a11
b10
b11
a21
a22
b20
b21
b22
Write Custom IIR Coefficients
WRITE ROM COEFFICIENTS 04 COEF SEL Use On-Chip Coefficients
NOP 05 - No Operation
NOP 06 - No Operation
FILTER START 07 - Start Digital Filter Operation