QUANZHOU WOUXUN ELECTRONICS CO., LTD Model: KG-689
Version: KG-689-0801-V1 Page 10 of 35
Circuit Description
6. Reset and reserve circuit
When connect with power, one reset circuit made up of T823 R823 R825 C825 output a positive impulse,
this impulse signal add to the 37th feet reset side of U81. When turn off the power, the 37th feet side of
U811 turn low, and CPU send all data to U835 to store, then go into reserve.
Detect battery voltage circuit
Input SB to the 23rd side A/D switch port of CUP(U811) after be disparted, and after disposal by CUP, drive
LCD battery level indicator.
Floodlight and LCD circuit
Floodlight and LCD directly be controlled on of off by CPU port circuit
DATA
CS
R/W
U711
HT1621
LCD
D4 42
D4 42
5V
CLK
DATA
U853
EEPROM
5V
PTT
MONI
46
61
47
48
49
50
55
56
57
58
59
T82 3
5V
37
5M
54
60
SB
51
52
53
23
38
图
7
Chart 7
wouxun
wouxun
wouxun
wouxun
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