UPD16662 View Datasheet(PDF) - NEC => Renesas Technology

Part Name

Description

Manufacturer

UPD16662

240 OUTPUT LCD COLUMN (SEGMENT) DRIVER WITH BUILT-IN RAM

NEC => Renesas Technology 

µPD16662

Self diagnostic function

This is a function to check whether the timing of each column/driver has deviated due to external noise. The slave

chip compares the L1 and L2 generated internally with the L1 and L2 of the master chip, and when there is

discordance, it sends a total column/driver refresh signal. When a refresh signal is received, the internal reset is

activated and timing is initialized. In this case, the /REFRH = L time and the four frame interval display are turned

OFF. The L1, L2 discordance will be monitored at the rising edge of the FRM once every 1/2 frame.

L1 (Master)

L2 (Master)

L1 (Slave)

L2 (Slave)

discrepancy

discrepancy

/REFRH

initialization

• Block configuration drawing (slave side)

/RESET

initialization

Internal reset

/REFRH

Self-diagnosis circuit

L1

Internal L1 signal

L2

Internal L2 signal

17

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