SC91214 查看數據表（PDF） - Silan Microelectronics
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SC91214 Datasheet PDF : 16 Pages
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SC91214/91215 SERIES
(Continued)
SC9121
4A
9
Pin No.
SC9121 SC9121
4B
4C
11
10
SC9121
4D
12
(N.A.)
(N.A.)
1
1
Pin
Name
DP
HFO
Description
Dialing pulse output
This is an N-channel open drain output. The
normal output will be “ON”during break an “OFF”
during make in the PULSE DIALING mode.
Hands-Free Control I/O pins
These pins enable and disable the Hands-Free
control function. When input pin HFI goes low, the
Hands-Free Control state is toggled on. The status
of the Hands-Free control state is listed in the
following table:
18
20
HFI
7
7
8
8
TONE Tone dialing output
When a valid key-press is detected in the DTMF
mode, appropriate low group and high group,
frequencies the dual tone output. TONE output is
in the “OFF”state in PULSE mode.
8
8
9
9
XMITMUTE Dialing transmission mute output
This is an N-channel open drain output. The
XMITMUTE is normally “OFF”. During pulse or DTMF
dialing this output is “ON”.
(N.A.)
9
(N.A.)
10
MODE Mode output pin
OUT This is an N-channel, open drain output. It is “ON”
during tone output and “OFF”during pulse output.
13
15
14
16
R1
Keyboard pins
14
16
15
17
R2
This input serves as the interface to an XY matrix
15
17
16
18
R3
keyboard. On a 4 X 4 matrix keyboard, the input
16
18
17
19
from the fourth column, C4 , should be connected
R4
10
12
11
13
to VSS.
C1
11
13
12
14
C2
12
14
13
15
C3
6
6
7
7
VDD Power supply pins
5
5
6
6
VSS These devices are designed to operate from 2.0V
to 5.5V.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.0 2004.08.03
Page 7 of 16
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