MCP2030 datasheet(48/66 Pages) MICROCHIP

48 / 66 page

MCP2030

DS21981A-page 48

FIGURE 5-11:

SPI Read Sequence.

LFDATA/RSSI/

CCLK/SDIO

TSU THD

TSCCS

THI TLO

1/FSCLK

TCS1

TCSH

TCS0

SDI

(input)

SCLK

(input)

ALERT

(output)

LFDATA

(output)

16 Clocks for Read Command,

TCSSC

TCSSC TCS1

TCSH

TCS0

SDO

SCLK

(input)

ALERT

(output)

LFDATA

(output)

16 Clocks for Read Result

(output)

SCLK/ALERT

ALERT

LFDATA

(output)

TDO

MSb

LSb

TCSSC

Address and Dummy Data

MCU SPI Read Details:

Drive the open collector ALERT output low.

•

To ensure no false clocks occur when CS drops.

Drop CS

•

SCLK/ALERT becomes SCLK input.

•

LFDATA/CCLK/SDIO becomes SDI input.

Change LFDATA/CCLK/SDIO connected pin to output.

•

Driving SPI data.

Clock in 16-bit SPI Read sequence.

•

Command, address and dummy data.

Change LFDATA/CCLK/SDIO connected pin to input.

Raise CS to complete the SPI Read entry of command and address.

Drop CS.

•AFE SCLK/ALERT becomes SCLK input.

•

LFDATA/CCLK/SDIO becomes SDO output.

Clock out 16-bit SPI Read result.

•

First seven bits clocked-out are dummy bits.

•

Next eight bits are the Configuration register data.

•

The last bit is the Configuration register row parity bit.

Raise CS to complete the SPI Read.

10.

Change SCLK/ALERT back to input.

Note:

The TCSH is considered as one clock. Therefore, the

Configuration register data appears at 6th clock after TCSH.

MCP2030 Datasheet(PDF) 48 Page - Microchip Technology

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