UPD16661A View Datasheet(PDF) - NEC => Renesas Technology

Part Name

Description

Manufacturer

UPD16661A

160-OUTPUT LCD COLUMN (SEGMENT) DRIVER WITH RAM

NEC => Renesas Technology 

µPD16661A

10. SELF-DIAGNOSIS FUNCTION

This is a function to check whether or not there has been a delay in the operation timing of each column driver

caused by external noise, etc. The slave chip compares the L1 and L2 signals of the master chip with the L1 and

L2 signals generated internally, and if a mismatch is discovered, the slave chip sends a refresh signal to all the

column drivers. When the refresh signal is received, the internal reset is activated, and the timing is initialized. At

this time, the display turns OFF while /REFRH = L and during the four frame cycle.

The L1 and L2 signals are checked for mismatch at the rising edge of /FRM once every half frame.

L1(Master)

L2 (Master)

L1 (Slave)

L2 (Slave)

/REFRH

Mismatch

Initialized

Mismatch

Initialized

Block configuration diagram (Slave side)

/RESET

Internal reset

/REFRH

Self-diagnosis circuit

L1

Internal L1 signal

L2

Internal L2 signal

18

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