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

KEY MATRIX CONFIGURATION

An example of key matrix configurations is shown below.

1) When pressing three or more times is assumed:

A configuration example is shown below. In this configuration, 0 to 32 ON switches can be

recognized.

KEY1

KEY2

KEY3

KEY4

KS1 KS2 KS3 KS4 KS5 KS6 KS7 KS8

C

=

2) When pressing twice or more times is assumed:

A configuration example is shown below. In this configuration, 0 to 2 ON switches can be recognized.

KEY1

KEY2

KEY3

KEY4

=

Diode A

KS1 KS2 KS3 KS4 KS5 KS6 KS7 KS8

In this configuration, pressing three or more times may cause OFF switches to be determined to be ON.

For example, if SW2 to SW4 are ON and KS1 has been selected (high level) as shown below, SW3 in which

current I1 is running is supposed to be detected to be ON. However, since SW2 and SW4 are ON, current

I2 runs thus resulting in SW1 to be recognized as being ON.

SW1 SW2

KEY1

I2

SW3 SW4

=

KEY2

I1

KEY3

KEY4

KS1 KS2 KS3 KS4 KS5 KS6 KS7 KS8

Select

6

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