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SC91415AP

TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE AND DUAL-TONE MELODY

Silan Microelectronics 

Silan

Semiconductors

SC91415 SERIES

PIN DESCRIPTION

Pin No.

AP BP CK DK

13 15 16 18

14 16 17 19

15 17 18 20

16 18 19 21

--

-- 22 24

--

--

1

1

5

5

6

6

4

4

5

5

3

3

4

4

1

1

2

2

2

2

3

3

6

6

7

7

7

7

8

8

Pin Name

ROW1

ROW2

ROW3

ROW4

ROW5

ROW6

COL1

COL2

COL3

COL5

COL4/KT

XIN

XOUT

Description

Keyboard scan pins of row group. In idle state ( HKS is “High” and

HFO is “Low”), these pins stay “High impedance” level to prevent

power consumption. Otherwise, these pins switch to “High” level for

detecting keyboard entry. These pins will output 600Hz signal while

keyboard is scanning.

Keyboard scan pins of column group. In idle state, these pins stay

“High impedance” level. Otherwise these pins switch to “Low” level for

detecting keyboard entry. These pins will output 600Hz signal while

keyboard is scanning.

The fourth column group pin of the keyboard that also provides the

keytone output. Normally, this pin stays “Low” level for detecting

keyboard entry. After a valid keyboard entry, this pin will output keying

confirmation tone that is 600 Hz signal and 30 ms duration. To

prevent signal interference, while DTMF issue, it will disable key tone

output except function key.

Oscillator input and output pins. A 3.579545MHz crystal or ceramic

resonator must be crossed connection to XIN and XOUT pins which

generate system clock.

The Tone/Pulse MUTE signal output pin that is NMOS open-drain

output structure. This pin will switch to “Low” level during Tone/Pulse

8

8

9

9

XMUTE dialing and hold function. Otherwise, this pin stays “High impedance”

level.

11 13 14 16

VDD Positive and negative power supply input pins. Recommended

9

9 10 10

VSS operating voltage from 2.0Vdc to 5.5Vdc.

-- 10 11 11

--

11 12 14

HFI

HFO

Handfree inputs pin which accepts falling edge signal to turn “on” or

turn “off” handfree function. This pin is hysteresis input structure and

built-in pull up resistor (typically 200kΩ).

Handfree outputs pin that is designed to control telephone line for

on-hook dialing or control speakerphone circuit for handfree

conversation. When handfree function is executed, this pin will switch

to“High”. Otherwise, this pin stays “Low” level.

The DTMF (Dual Tone Multi-Frequency) and music signals output pin.

Normally, this pin stays “Low” level. In Tone dialing mode, this pin will

10 12 13 15

DTMF output DTMF signal that is corresponding to keyboard 0 . 9, * and #

keys. Beside this, in the line hold duration, this pin will issue dual-tone

music for telephone line.

(to be continued)

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 2.0

2001-11-13

7

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