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NT91214/15 Series
9V1.0
Pin Descriptions (continued)
Pin No.
NT91215A
NT91214A
NT91215B
NT91214B
NT91215C
NT91214C
NT91215D
NT91214D
Designation
I/O
Description
8899
XMITMUTE
O
Dialing transmission mute output
This is an N-channel open drain output
The XMITMUTE is normally "OFF"
During pulse of DTMF dialing this
output is "ON".
(N.A.)
9
(N.A.)
10
MODE OUT
O
Mode output pin
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 keyboard. On a 4 x 4 matrix
15
17
16
18
R3
keyboard, the input from the fourth
column, C4 , should be connected to
16
18
17
19
R4
VSS.
10
12
11
13
C1
11
13
12
14
C2
12
14
13
15
C3
6677
VDD
Power supply pins
5566
VSS
These devices are designed to operate
from 2.0V to 5.5V.
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