SC91650A SILAN [Silan Microelectronics Joint-stock], SC91650A Datasheet - Page 8

• Manufacturer Part Number: SC91650A
• Description: 13 MEMORY TONE / PULSE DIALER WITH REDIAL SAVE HANDFREE & HOLD FUNCTION
• Manufacturer: SILAN [Silan Microelectronics Joint-stock]

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HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
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Silan
Semiconductors
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R2
R3
R4
C2
C3
C4
C5
R1
C1
*Provides keyboard scanning.
a. Dialling option:
*The resistor connection between selected Row (or Column) and Vss
may select most countries telecom specification.
b. Keyboard scanning:
*While
state. While
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 &
*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)
Column connection or by electronic input (as shown in figur e 1c).
Figure1a: Single contact form
Row
HKS
Figure1c: Electronic signal input keyboard configuration
keyboard configuration
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HKS
pin is HIGH, Both column pin and row pin are in floating
Column
Row
pin is LOW, the column group stays in “HIGH”
Column
R=820k
Figure1b: Dual contact form
R1
R2
R3
R4
C4 C3 C2 C1
keyboard configuration
REV: 1.0
V
V
V
V
Column
DD
SS
DD
SS
Row
(to be continued)
2001.01.15