CS5378 datasheet(30/88 Pages) CIRRUS

30 / 88 page

CS5378

DS639F2

9. CONFIGURATION BY MICROCONTROLLER

After reset, the CS5378 reads the state of the

GPIO7:BOOT pin to determine a source for con-

figuration commands. If BOOT is low, the CS5378

receives configuration commands from a micro-

controller.

9.1 Pin Descriptions

Pins required for microcontroller boot are listed

here, other serial pins are inactive.

SS:EECS - Pin 27

Slave select input pin, active low. Serial chip select

input from a microcontroller.

MOSI - Pin 26

Serial data input pin. Valid on rising edge of SCK,

transition on falling edge.

MISO - Pin 25

Serial data output pin. Valid on rising edge of

SCK, transition on falling edge. Open drain output

requiring a 10 k

Ω pull-up resistor.

SCK - Pin 24

Serial clock input pin. Serial clock input from mi-

crocontroller, maximum 4.096 MHz.

9.2 Microcontroller Hardware Interface

When booting from a microcontroller the CS5378

receives configuration commands and configura-

tion data through serial transactions, as shown in

Figure 18. 8-bit SPI opcodes and 8-bit addresses

are combined to read and write 24-bit configuration

commands and data.

Microcontroller serial transactions require toggling

the SS:EECS pin as the CS5378 chip select and

writing a serial clock to the SCK input. Serial data

is input to the CS5378 on the MOSI pin, and output

on the MISO pin.

9.3 Microcontroller Serial Transactions

Microcontroller configuration commands are writ-

ten to the digital filter through SPI registers. A 24-

bit command and two 24-bit data words can be

written to the SPI registers in any single serial

transaction. Some commands require additional

data words through additional serial transactions to

complete.

9.3.1

SPI opcodes

A microcontroller communicates with the CS5378

serial port using standard 8-bit SPI opcodes and an

8-bit address. The standard SPI ‘Read’ and ‘Write’

opcodes are listed in Figure 18.

SCK

MISO

MOSI

Pin Logic

SPI™

Figure 17. Serial Interface Block Diagram

Command

SS:EECS

Registers

Digital Filter

Interpreter

Serial

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