Silan
Semiconductors
SC91310 Series
PIN DESCRIPTION
Pin No.
Pin Na me
I/O
De sc ription
The keyboard input may be from either the standard 4x4 keyboard or an
inexpensive single contact (form A) keyboard. Electronic input from a µC can
also be used. A valid key entry is defined as a single row being connected to a
single column.
1~4
&
Column-
I
Row Inputs
15~18
A built-in inverter provides oscillation with an inexpensive 3.579545 MHz crystal
or ceramic resonator.
XT,
XT
7,8
9
I,O
O
The T/P
is a conventional CMOS N-channel open drain output. The
MUTE
T/P
MUTE
output transistor is switched on during pulse and tone mode dialing sequence
and flash break. Otherwise, it is switched off.
Pulling mode pin to Vss places the dialer in tone mode. Pulling mode pin to VDD
places the dialer in pulse mode (10 pps). Leaving mode pin floating places the
dialer in pulse mode (20 pps).
13
MODE
I
Hook switch input.
= 1: On-hook state. Chip in sleeping mode, no
HKS
operation.
= 0: Off-hook state. Chip enabled for normal operation. The
HKS
DP
HKS
10
11
O
O
pin is pulled to VDD by an internal resistor.
HKS
N-channel drain dialing pulse output (Figure 1). Flash key will cause
active in both pulse mode and tone mode.
to go
DP
In pulse mode, remains in low state at all times. In tone mode, outputs a dual or
single tone. Detailed timing diagram for tone mode is shown in Figure 2(a, b).
Output Frequency(Hz)
Specified
697
Actual
699
Error %
+0.28
-0.52
R1
12
DTMF
O
R2
770
766
R3
852
848
-0.47
R4
941
948
+0.74
+0.57
-0.30
C1
1209
1336
1477
1216
1332
1472
C2
C3
-0.34
14,6
5
VDD, Vss
B/M
I
I
Power input pins.
The break make ratio is 60:40 if /M = 1 and is 66.6:33.3 if B/M = 0. This pin has
no function in DTMF mode.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD.
Rev: 2.1
2002.12.03
5
SILAN [ SILAN MICROELECTRONICS JOINT-STOCK ]
