UPD16431AGC-7ET 查看數據表（PDF） - NEC => Renesas Technology

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UPD16431AGC-7ET

1/2, 1/3, 1/4-DUTY LCD CONTROLLER/DRIVER

NEC => Renesas Technology 

µPD16431A

If diode A is not available, not only the key data may not be read normally but the LCD display may be

affected or ICs may be damaged or deteriorated.

For example, if SW1 and SW2 are ON and KS1 has been selected (high level) as shown below, this will

cause not only current I1 which is supposed to run but also short-circuited current I2 of KS1 to KS2 to run.

It is possible that this will then cause the following three problems:

(1)Since the level to KEY2 is not correctly sent, the key data cannot be latched correctly.

(2)If KS2 is used as SEG2 as well, the LCD display may be distorted (such as causing unintended segments

to light up).

(3)Since the short-circuited current (current I2) of KS2 (high level) to KS2 (low level) runs, ICS may be

damaged or deteriorated

KEY1

SW1 SW2

=

KEY2

I1

KEY3

KEY4

I2

KS1 KS2 KS3 KS4 KS5 KS6 KS7 KS8

Select

(high level)

Non Select

(low level)

7

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