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DGND V+ V-
Power
Reference
Low-Battery Detection
Display Latch
OVSG OR1 VR2 VR3 VR4 VR5 VR1 SGND
High Speed ADC Input Switch High resolution ADC
Bar Graph Counter
Decoder
Main Counter Oscillator XTAL OSC1 OSC2
AC/DC Convertor TEST5 ACVL ACVH ADI ADO
APO
RS232
SLEEP
RS323 SDO
XTAL NC NC NC HOLD RANGE KEY FC5 FC4 FC3 FC2 FC1 LBAT9 SDO C+ CVDGND AGND AGND
OSC2 OSC1 BUZOUT BUZIN ANNUNC BP2 BP3 BP1 BP4 SEG26 SEG25 SEG24 SEG23 SEG22 SEG21 SEG20 SEG19 SEG18 SEG17 SEG16 SEG15 SEG14 SEG13 SEG12 SEG11 SEG10 SEG09 SEG08 SEG07 SEG06
80 75 70 65 60 55 50
FC5 FC4 FC3 FC2 FC1 HOLD RANGE KEY
45 40 35 25 30
85
90
Cyrustek. com.tw ES51971Q
5 10 15 20
95
100
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nAyAyAXrAdAp1/21/4 AA3/4
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1 p u sh > 1 s 1 p u sh < 1 s M an u a l m o d e
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0
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0.37 mS 0.5ms
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ANNUC
BP3
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16ms
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10M
VR
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553 A %@ 9(c) 8 7642 A &0(&$ 1)'%# "
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15K
D1
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10K 1u
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270K
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BATTERY
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0.47u
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100
680K
88M
100 1K 10K 101K 1.11M
0.1u
VR1 VR2 OVH
AGND VLBAT9
+3V
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ES51971
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100K 100K
-3V
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Note: Light shielding for the diodes and Zeners
NC NC 10M NC NC (35) VR1 SGND SGND NC NC SEG05 SEG04 SEG03 SEG02 SEG01 (45) RS232 NC SLEEP NC NC (40) NC
LCD Display
5.6VZI
XTAL NC NC NC HOLD (85) RANGE KEY FC5 FC4 FC3 (90) FC2 FC1 LBAT9 SDO C+ (95)
CV-
DGND AGND AGND (100)
1/4A A A AA 3/4 1/2 1/4 wAxT y ww* v(R) W
P i
| (c)
SGND
mA
10A
uA
R
15K 1u
D1
5K
450
100K 100K 10A 0.005 100K 100 1.5K 1n PTC
0.495
4.5
45
Zener 6V
D2
mA
mA
uA
uA
15K
10K
1u
0.47u
0.1u 0.22u
0.1u
1u 88M 0.022u 200K 0.01u
0.47u 200K
0.047u
100 1K 10K 101K 1.11M
10K 91K 4.7u
7.5V ZI 5.6V ZI 0.1u
VR (30) VRH ADI ADO NC CAZL CAZH CL+ BUFH CHCIH (5) V+ V+ CH+
TEST5 ACVL ACVH (25) BUFL IVSH IVSL OVX (15) OVH OVSG OR1 VR5 VR4 (20) VR3 VR2 CLCIL (10) 10u 0.1u 3V 0.1u 0.1u 9V ANNUNC (75) BP2 BP3 BP1 BP4 (70) SEG26 SEG25 SEG24 OSC1 BUZOUT BUZIN OSC2 -3V -3V
4M Hz
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v(R)

W
| (c)
L
B
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b a
d
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