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SC91650 Datasheet(PDF) 8 Page - Silan Microelectronics Joint-stock

Part # SC91650
Description  13 MEMORY TONE / PULSE DIALER WITH REDIAL SAVE HANDFREE & HOLD FUNCTION
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Manufacturer  SILAN [Silan Microelectronics Joint-stock]
Direct Link  http://www.silan.com.cn
Logo SILAN - Silan Microelectronics Joint-stock

SC91650 Datasheet(HTML) 8 Page - Silan Microelectronics Joint-stock

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Silan
Semiconductors
SC91650/1/2 A/B
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
REV: 1.0
2001.01.15
8
PIN DESCRIPTION
Pin No.
650A/B 651A/B 652A/B
Pin Name
Description
12
12
12
C1
23
23
23
C2
34
34
34
C3
45
45
45
C4
56
56
56
C5
15
18
15
18
15
18
R1
16
19
16
19
16
19
R2
17
20
17
20
17
20
R3
18
21
18
21
18
21
R4
*Provides keyboard scanning.
a. Dialling option:
*The resistor connection between selected Row (or Column) and Vss
may select most countries telecom specification.
R=820k
R1
R2
R3
R4
C4 C3 C2 C1
b. Keyboard scanning:
*While
HKS pin is HIGH, Both column pin and row pin are in floating
state. While
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
keyboard (as figure1b), the inexpensive single contact keyboard (as
figure 1a), and electronic input (as figur e 1c).
*When HKS is “LOW”, a valid key entry is defined by related Row &
Column connection or by electronic input (as shown in figur e 1c).
*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
debounce circuit. (Th e debounce time = 20ms)
VDD
Column
Row
Column
Row
Column
VSS
VDD
VSS
Row
Figure1a: Single contact form
keyboard configuration
Figure1b: Dual contact form
keyboard configuration
Figure1c: Electronic signal input keyboard configuration
(to be continued)


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