LC89057W-VF4A-E View Datasheet(PDF) - ON Semiconductor

Part Name

Description

Manufacturer

LC89057W-VF4A-E

Digital Audio Interface Transceiver

ON Semiconductor 

LC89057W-VF4A-E

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9.3 Demodulation Function Master/Slave Settings (CKST/PB)

• A master/slave function that allows multi-channel synchronized transfer using multiple LC89057W-VF4A-E ICs is

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included. For this setting, connects either a 10kΩ pull-down or a pull-up resistor to CKST/PB.

• Set to the master mode normally, when single LC89057W-VF4A-E IC is used. When multiple LC89057W-VF4A-E

ICs are used, set one of them to the master mode and the others to the slave mode.

• In the multi-channel synchronous transfer mode using multiple LC89057W-VF4A-E ICs, connect RBCK and RLRCK

(output) on the master side to RBCK and RLRCK (input) on the slave side. Also connect XMCK on the master side to

XIN on the slave side. At this time, the polarity of RBCK and RLRCK, and the frequency of XIN and XMCK must be

identical.

• If the input data sampling frequency or the phase are different between the master mode and slave mode or if the clock

sources differ while the sampling frequencies are not different, some of the output data may get dropped or read twice

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on the slave side. You can see if these are happening by INT and the microcontroller interface.

Table 9.3 Master/Slave Switching (Register Connection)

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CKST/PB

Mode

Pull-down

Master

Pull-up

Slave

Pin

RMCK

RBCK

RLRCK

Table 9.4 Clock Pin State

Master mode

Output

Output

Output

Slave mode

Output

Input

Input

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9.4 Switching between Modulation Function and General-Purpose I/O Port (INT)

• The modulation function and the general-purpose I/O function share same pins. Therefore, these two functions cannot

be used simultaneously.

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• To switch functions, connect either a 10kΩ pull-down or pull-up resistor to INT pin.

Table 9.5 Switching between Modulation Function and General-Purpose I/O Port (Register Connection)

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INT State

Function

Pull-down

Modulation function

Pull-up

General-purpose I/O

No.7202-12/59

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