CS5378 datasheet(28/86 Pages) CIRRUS

28 / 86 page

CS5378

DS639F1

Sample Command:

Write IIR1 coefficients 0x84BC9D, 0x7DA1B1,

0x825E4F,

and IIR2 coefficients 0x83694F,

0x3CAD5F, 0x3E5104, 0x835DF8, 0x3E5104.

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:

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

No Operation

WRITE DF REGISTER

REG

DATA

Write Digital Filter Register

WRITE FIR COEFFICIENTS

NUM FIR1

NUM FIR2

(FIR COEF)

Write Custom FIR Coefficients

WRITE IIR COEFFICIENTS

a11

b10

b11

a21

a22

b20

b21

b22

Write Custom IIR Coefficients

WRITE ROM COEFFICIENTS

COEF SEL

Use On-Chip Coefficients

NOP

No Operation

NOP

No Operation

FILTER START

Start Digital Filter Operation

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