Semiconductor Data - Alinco DJ-191 Service Manual

SEMICONDUCTOR DATA

1) 24LC16BT-I/SN (XA0351)
EEPROM
Pin A ssignm ent
o
AOC □ Vss
24LC01B
□
Aie
24LC02B WP
24LC04B
□
A 2 C
SCL
n At r 'r t O D
t i L ^ U O D
24LC16B
J S D A
V s sC
2) LC73881M-TLM (XA0344)
DTMF Receiver
Pin Functions
Pin nos. Signal I/O
IN P U T
1
2 PD
0
3 O S C O
4 OSC!
5
-
V SS
6 0
SD
7 1
AC K
8 0
S T D
0
9 EST
V D D -
10
1
An input coupling capacitor is required. This input signal is internally biased by the V DD/2.
1
W hen this signal goes H IG H , the system enters the power-down mode.
These lines are connected to a crystal oscillator or a ceramic resonator of 194,304 M H z to
1
form the oscillation circuit.
Power terminal (usually 0V).
The decoded D T M F data is output as serial 4-bit data, starting with the LSB.
The A C K signal is used to shift out the data to pin 2 (PD ). 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.
This signal goes HIG H when a D T M F code is sent.
slower than the E ST signal, however the burst frequency for this signal uses a dead band.
This signal goes HIG H when a D T M F code is sent.
determine an appropriate time, and then four pulses are input to the A C K terminal to allow
the SD terminal to output the D T M F data.
Power terminal (usually, 2.7 V to 5.5 V)
Block Diagram
WP
Description
This signal changes LOW to H IG H
This line is externally monitored to