MSP3400CPP View Datasheet(PDF) - Micronas

Part Name

Description

Manufacturer

MSP3400CPP

Multistandard Sound Processor

Micronas 

MSP 3400C

13. I2S Bus in Master/Slave Configuration with

Standby Mode

In a master/slave application, both MSP, after power up

and reset, will start as master by default. This means that

before the slave MSP is set to slave-mode, relatively

large current-pulses (~20 mA) in the I2S_CL and

I2S_WS lines can cause some crackling noise during

startup time, if the the MSP is demuted before the slave

MSP is set to slave mode.

These high current pulses are also possible, if the active

I2S_CL and I2S_WS outputs of the master MSP are

clipped by the correspondent inputs of the slave MSP,

which is switched to standby mode.

To avoid this, it is recommended, that the I2S-bus lines

I2S_CL and I2S_WS are current-limited to about 5 mA

with series resistors of about 390 Ω (330...470 Ω).

Fig. 13–1 depicts the recommended application circuit

for two MSP 3410/00 or MSP 3400C, which are con-

nected via I2S Bus in a master/slave configuration, and

where the slave MSP can be switched in standby mode

(+5 Volt power is switched off).

PRELIMINARY DATA SHEET

+5 V

Standby control

18.432 MHz

62 63

I2S_DA_IN 14

MSP 3410/00

I2S_DA_OUT 13

MSP 3400C

(master)

I2S_WS 12

R

I2S_CL 11

18.432 MHz

18

DVSUP

7

62 63

STANDBYQ

13 I2S_DA_OUT

14 I2S_DA_IN

12 I2S_WS

MSP 3410/00

MSP 3400C

(slave)

C

11 I2S_CL

minimal corner frequency = 4 MHz

with R = 390 Ω (330–470 Ω)

Fig. 13–1: I2S master/slave application

68

Micronas

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