CS6403 datasheet(15/54 Pages) CIRRUS

15 / 54 page

Interfacing as a Slave to an external DSP

(Mode 2)

When interfacing to an external DSP (Mode 2),

the CS6403 is configured as a slave to the DSP:

SSI; i.e., SCLK, and SSYNC signals are pro-

vided to the CS6403 by the DSP. An example of

the interface circuitry is shown in Figure 7.

In this case, the DSP sends a single start-of-

frame pulse to the SSYNC input one SCLK

period before the start of a data frame.

Since

there is only one SSYNC input, every data frame

includes both a data read from the CS6403 and a

data write to the CS6403. The behavior of the

serial interface is illustrated in Figure 8.

DSP

SDI

SCLK

SSYNC

SDO

CLKIN

CLKOUT

RESET

System

Reset

SPKROUTP

SPKROUTN

VREF

VCM

0.1

µF

SCLK_RATE0

SCLK_RATE1

CONFIG

GPOUT0

GPOUT1

MICIN

Microphone

Phantom Power

Supply

2.2k

Ω

0.47

µF

0.022

µF

NPO

150

Ω

Microphone

0.1

µF

Ω

AVDD

AGND0

+5V Analog

Supply

AGND1

DGND0

PVDD

PGND1

PGND0

µF

DGND1

DVDD1

DVDD0

SYNCOUT

CS6403

Analog

Ground

Digital

Ground

Speaker

Ground

UALAW

µF

Ω

0.1

µF

RESERVED1

SFRAME

SMASTER

470 pF

CLK_SEL

GPIN0

GPIN1

GPIN2

GPIN3

RESERVED0

RESERVED2

RESERVED6

RESERVED3

RESERVED4

RESERVED5

µF

0.1

µF

0.1

µF 0.1 µF 0.1 µF 0.1 µF

Figure 7. DSP Connection Diagram (Mode 2)

CS6403

DS192PP6

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