CS5374 datasheet(26/44 Pages) CIRRUS

26 / 44 page

CS5374

DS862F1

The SPI2DAT register is 24-bits wide and can con-

tain up to three bytes of data to follow the SPI op-

code and address. For configuring the CS5374,

however, only one data byte per register address is

required and is written aligned with the upper byte

(i.e. 0x8F0000).

The SPI2CTRL register is 24-bits wide and config-

ures/controls the SPI 2 hardware, with bit assign-

ments detailed in the CS5376A data sheet. If the

GPIO:CS0 and GPIO1:CS1 pins are used as chip

selects, separate SPI2CTRL values can initiate se-

rial transactions to each device (i.e. 0x3F0161,

0x3F4162).

Tables 6, 7, and 8 show the CS5376A primary

SPI 1 transactions required to write the SPI 2 digi-

tal filter registers and configure two CS5374 devic-

es for normal operation using the CS0 and CS1

chip selects.

Table 6. Example CS5376A SPI 1 Transactions to Write the CS5374 AMP1CFG Register

Transaction

CS5376A Primary SPI 1 Write

Description

MOSI: 02 | 03 | 00 00 01 | 00 00 11 | 00 02 01

MISO: -----------------------------------------------------------

SPI Command : 0x02 : Write

SPI Address : 0x03 : SPICMD

SPICMD : 0x000001 : Write Register

SPIDAT1 : 0x000011 : SPI2CMD

SPIDAT2 : 0x000201 : Write AMP1CFG

Delay 1ms, monitor SINT, or poll E2DREQ

See the CS5376A data sheet.

MOSI: 02 | 03 | 00 00 01 | 00 00 12 | 20 00 00

MISO: -----------------------------------------------------------

SPI Command : 0x02 : Write

SPI Address : 0x03 : SPICMD

SPICMD : 0x000001: Write Register

SPIDAT1 : 0x000012 : SPI2DAT

SPIDAT2 : 0x200000 : INA, x1 Gain

Delay 1ms, monitor SINT, or poll E2DREQ

See the CS5376A data sheet.

MOSI: 02 | 03 | 00 00 01 | 00 00 10 | 3F 01 61

MISO: -----------------------------------------------------------

SPI Command : 0x02 : Write

SPI Address : 0x03 : SPICMD

SPICMD : 0x000001: Write Register

SPIDAT1 : 0x000010 : SPI2CTRL

SPIDAT2 : 0x3F0161 : CS0 Transaction

Delay 1ms, monitor SINT, or poll E2DREQ

See the CS5376A data sheet.

MOSI: 02 | 03 | 00 00 01 | 00 00 10 | 3F 41 62

MISO: -----------------------------------------------------------

SPI Command : 0x02 : Write

SPI Address : 0x03 : SPICMD

SPICMD : 0x000001: Write Register

SPIDAT1 : 0x000010 : SPI2CTRL

SPIDAT2 : 0x3F4162 : CS1 Transaction

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