CS5464 datasheet(18/46 Pages) CIRRUS

18 / 46 page

CS5464

DS682F3

5.2.5 Serial Interface

The CS5464 provides 5 pins, SCLK, SDI, SDO, CS, and

MODE for communication between a host microcon-

troller or serial E2PROM and the CS5464.

MODE is an input that, when high, indicates to the

CS5464 that a serial E2PROM is being used instead of

a host microcontroller. It has a weak pull-down allowing

it to be left unconnected if microcontroller mode is used.

SCLK is used to shift and qualify serial data. Serial data

changes as a result of the falling edge of SCLK and is

valid during the rising edge. It is a Schmitt-trigger input

for host microcontrollers, and a driven output for serial

E2PROMs.

SDI is the serial data input to the CS5464.

SDO is the serial data output from the CS5464. It’s out-

put drivers are disabled whenever CS is de-asserted, al-

lowing other devices to drive the SDO line.

CS is the chip select input for the serial bus. A high logic

level de-asserts it, tri-stating the SDO pin and clearing

the serial interface. A low logic level enables the serial

port. This pin may be tied low for systems not requiring

multiple SDO drivers. CS is a driven output when inter-

facing to serial E2PROMs.

CS5464 Datasheet(PDF) 18 Page - Cirrus Logic