Silan
Semiconductorsꢀ
SC9302 Series
ꢀ
11. DOUT BCD CODE
When dialing, the corresponding 4-bit BCD codes are serially presented on DOUT from MSB to LSB. The data of
the DOUT is valid at the falling edge of the CLOCK pin. The following table lists the BCD codes corresponding to the
keyboard input.
Key-In
BCD Code
0001
Key-In
BCD Code
1000
1
2
3
4
5
6
7
8
9
0010
1001
0011
0
1010
0100
*/T
#
1101
0101
1100
0110
F
1011
0111
P
1110
12. LOCK FUNCTION
The function aims to detect locked dialing number to prevent a long distance call. The dialing output of the chip is
disabled if the first input key after on-off-hook is the locked number when the lock function is enabled. The lock
function selection is listed below.
The SC9302X version is the pin-selected type; on the other hand, the SC9302XLT is the key-board operated type.
However, the SC9302XT version does not support any lock function.
• SC9302X VERSION
LOCK Pin
OPEN
VDD
Function
Normal dialing (no lock)
“0, 9” is inhibited
“0” is inhibited
Vss
• SC9302XLT VERSION
RK31
No
RK41
Function
Keyboard operated IDD lock
Lock 0
No
Yes
No
No
Yes
Yes
Lock 0,9
Yes
All keys are locked
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 2.0
ꢀ
2001-11-01ꢀ
16
SILAN [ SILAN MICROELECTRONICS JOINT-STOCK ]
