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PD16431A Datasheet(PDF) 10 Page - Renesas Technology Corp

No. de pieza PD16431A
Descripción Electrónicos  1/2, 1/3, 1/4-DUTY LCD CONTROLLER/DRIVER
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Fabricante Electrónico  RENESAS [Renesas Technology Corp]
Página de inicio  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

PD16431A Datasheet(HTML) 10 Page - Renesas Technology Corp

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Data Sheet S15129EJ3V0DS
8
µµµµPD16431A
If diode A is not available, not only the key data may not be read correctly, but the LCD display may be affected or IC
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 and 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, IC may be damaged or
deteriorated.
KEY1
KS1
KS2
KS3
KS4
KS5
KS6
KS7
KS8
KEY2
KEY3
KEY4
=
I2
I1
SW1
SW2
Select
Non Select
(low level)
(high level)


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