SC91710A 查看數據表（PDF） - Silan Microelectronics

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SC91710A

T/P SWITCHABLE DIALER WITH REDIAL HANDFREE FUNCTION

Silan Microelectronics 

SC91710A/B

PIN DESCRIPTION

Pin No.

Pin Name

SC91710A/AS SC91710B

Description

* Provides keyboard scanning.

4

4

C1

* HKS pin is LOW, the column group stays in “HIGH”state and

row group stays in “LOW”state.

* The keypad is compatible with the standard dual contact matrix

1

1

C2

keyboard (as figure1b), the inexpensive single contact keyboard

(as figure 1a), and electronic input (as figure 1c).

2

2

* When HKS is “LOW”, a valid key entry is defined by related Row

C3

& Column connection or by electronic input (as shown in figure

1c).

3

3

C4

* Activation of two or more keys will result in no response, except

for single key.

* To avoid keyboard-bouncing error, this chip provides built-in

14

16

R1

debounce circuit. (The debounce time = 20ms)

Row

Column

Row

15

17

R2

Column

Figure1a: Single contact form Figure1b: Dual contact form

keyboard configuration

keyboard configuration

16

18

R3

Row

VDD

VSS

13

15

R4

Column

VDD

VSS

Figure1c: Electronic signal input keyboard configuration

* Oscillator input & output pins.

5

5

OSCI * The 3.579545MHz oscillator is formed by a built-in inverter inside

of this chip and by connecting a 3.579545MHz crystal or a

ceramic resonator across the OSCI and OSCO pins. (built-in

6

6

OSCO

feedback resistor and capacitor)

* When HKS is “LOW”, a valid key-in may turn on this oscillator

and generates a 3.579545 MHz clock.

* Mute output pins.

* NMOS open drain output structure.

7

7

XMUTE * The output is in “LOW”state during dialing sequence (both Pulse

and Tone mode) otherwise this pin is “high-impedance”.

* Long (continue) Mute.

8

8

VSS * Negative power supply pin.

9

11

VDD * Positive power supply pin.

(To be continued)

HANGZHOU SILAN MICROELECTRONICS CO.,LTD

Http: www.silan.com.cn

REV:2.2 2007.03.07

Page 5 of 18

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