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AS8579

Functional Description

Datasheet

• PUBLIC

DS000707

• v4-01 • 2022-Jun-08

│ 19

Symbol

Parameter

Min

Typ

Max

Unit

tRO

Rise Time

7.2

tFO

Fall Time

7.5

tCS_N

CS_N Negated Time

fOP

Transfer Frequency

MHz

Figure 14:

Timing Diagram

The serial communications shall be accomplished with the CS, SCLK, MOSI, and MISO pins. The host

CPU selects the AS8579 with the CS signal and shifts data into the AS8579 MOSI input using the

SCLK for synchronizing the bit shifts. Upon receiving SCLKs from the host CPU (when selected), the

AS8579 shifts data out the MISO pin. Serial data from MOSI is latched into the shift register on the

rising edge of SCLK. Data is shifted out to MISO on the falling edge of SCLK.

There are 3 types of commands for the SPI:

●

Read

●

Write

●

“Quick Read”

All command and data bytes are 8 bits wide. Data bytes always sent and received MSB first.

(Input)

SCLK

(Input)

MOSI

(Input)

MISO

(Output)

tSCK

tLEAD

tSUS

tDIS

tLAG

tCS_N

tSCKHS

tSCKLS

MSB

Data

LSB

tHS

tVS

tRO

tFO

tHO

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