Aiwa TN-F205, Руководство по обслуживанию

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30
I
O
—
I/O
O
I
O
O
I
—
I
The keyboard inputs may be used with either a standard 5 x 4 keyboard or an
inexpensive single contact (Form A) keyboard. Electronic input from a µC can also be
used. A valid key is defined as a single row being connected to a single column.
The H/P MUTE is a conventional inverter output. During pulse dialing, flash break or
hold period, this output is active high; otherwise, it remains in low state.
Power input pins.
A built-in inverter provides oscillation with an inexpensive 3.579545 MHz crystal or
ceramic resonator.
______
The T/P MUTE is a conventional CMOS N-channel open drain output.
The output transistor is switched on during dialing sequence and flash break time.
Otherwise, it is switched off.
Hook switch input.
____
HKS = VDD: On-hook state. Chip in sleeping mode, no operation.
____
HKS = VSS: Off-hook state. Chip is enabled for normal operation.
____
HKS pin is pulled to VDD by an internal resistor.
___
N-channel open drain dialing pulse output. Flash key will cause DP to be active in
either tone mode or pulse mode.
In pulse mode, this pin remains in low state at all times. In the tone mode, it will output
a dual or single tone.
Pulling mode pin to VSS places the dialer in tone mode. Pulling mode pin to VDD
places the dialer in pulse mode with M/B ratio of 40 : 60 (10 ppS, except for
W91342N/W91342AN = 20ppS)
Floating mode pin places the dialer in pulse mode with M/B ratio of 33.3 : 66.7
(10 ppS, except for W91342N/W91342AN = 20 ppS.)
Power input pins.
The keyboard inputs may be used with either a standard 5 x 4 keyboard or an
inexpensive single contact (Form A) keyboard. Electronic input from a µC can also be
used. A valid key is defined as a single row being connected to a single column.
1-4
5
6
7, 8
9
10
11
12
13
14
15-18
C1-C4
H/P MUTE
VSS
___
XT, XT
______
T/P MUTE
____
HKS
___
DP
DTMF
MODE
VDD
R1-R4
IC, W91340N
Pin No. Pin Name I/O Description
Output Frequency
Specified Actual Error %
R1 697 699 + 0.28
R2 770 766 - 0.52
R3 852 848 - 0.47
R4 941 948 + 0.74
C1 1209 1216 + 0.57
C2 1336 1332 - 0.30
C3 1477 1472 - 0.34
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