Alinco DJ-191, Руководство по обслуживанию, Страница: 9 / 47

SEMICONDUCTOR DATA
1) 24LC16BT-I/SN (XA0351)
EEPROM
Pin A ssignm ent
AOC
o
24LC01B
□ Vss
Aie
24LC02B
□
WP
A2C
24LC04B
n At r 'r t O D
t i L ^ U O D
□
SCL
V s s C
24LC16B
J S D A
Block Diagram
WP
2) LC73881M-TLM (XA0344)
DTMF Receiver
Pin Functions
Pin nos. Signal I/O
Description
1 IN P U T
1
An input coupling capacitor is required. This input signal is internally biased by the V DD /2.
2 PD
1
W hen this signal goes H IG H , the system enters the power-down mode.
3 O S C O
0
These lines are connected to a crystal oscillator or a ceram ic resonator of 19 4,30 4 M H z to
form th e oscillation circuit.
4 O SC!
1
5
V S S
- Power term inal (usually 0V).
6
SD
0
T he decoded D T M F data is output as serial 4-bit data, starting with the LSB.
7
A C K
1
T he A C K signal is used to shift out the data to pin 2 (P D ). Four pulses are required to shift
out a four-bit D T M F code. T h e leading edge of the first pulse latches the data into the shift
register before shifting out.
8
S T D
0
This signal goes H IG H w hen a D T M F code is sent. This signal changes LOW to H IG H
slower than the E S T signal, how ever the burst frequency for this signal uses a dead band.
9
E S T
0
This signal goes H IG H w hen a D T M F code is sent. This line is externally monitored to
determ ine an appropriate time, and then four pulses are input to the A C K terminal to allow
the SD term inal to output the D T M F data.
10
V D D -
Power term inal (usually, 2.7 V to 5 .5 V)