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DGND V+ V-
Power
Reference
Low-Battery Detection
OVSG OR1 VR2 VR3 VR4 VR5 VR1 SGND ADP VBAR
High Speed ADC Input Switch High resolution ADC
Bar Graph Counter
Main Counter Oscillator OSC1 OSC2 VAHZ
Capcitance Measurement CA+ CAR9K R1K
AC/DC Convertor TEST5 ACVL ACVH ADI ADO
APO
NC VAHZ NC NC HOLD RANGE KEY FC5 FC4 FC3 FC2 FC1 LBAT9 SDO C+ CVDGND AGND AGND
OSC2 OSC1 BUZOUT BUZIN ANNUNC BP1 BP2 BP3 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
SLEEP
RS323 SDO
85
90
Cyrustek. com.tw ES51978Q
5 10 15 20
95
100
V+ V+ CH+ CHCIH BUFH CAZH CL+ CLCIL CAZL BUFL IVSH IVSL OVX OVH OVSG OR1 VR5 VR4 VR3 VR2 TEST5 ACVL ACVH ADI ADO ADOHZ VRH VR
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LBAT9 Display Latch LCD Driver Decoder Frequency Counter FREQ Buzzer Output BUZIN BUZOUT RS232 Control Input
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VAVA+ VRH VR C+ C-

SEG05 SEG04 SEG03 SEG02 SEG01 RS232 FREQ SLEEP CA+ CAR1k R9k NC NC VBAR VR1 SGND ADP VAVA+
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m h} h@ij D iiyj 0E ~ F '1/4~ e j ~ g} G GE h e P E u E } 5} E g 5e G ~ 0F 5i0(c)j G g e ~g ho G E hg ~ r} h b h} r j E x hw dj i} E ie E (c)~ G h G Fig @s5i'$ ht A9Q(7# * (R) 5@1l
mjr E ii} @{ 5r sj G iu(c)~ E 5Fi'%u E irb ~ g ~ G r t j ~ j tg e g } m 0j { ~ iyi(c)ir iuiiuF E i%lslj G E )ysj G pt G 'j 0E 0h { g E j g ~ g j ~ j e jeh k ~j k r j k~ G r h ~} m e j D j g hg ~ t ro (c)i} E u0iIPifh G 1@h j h~ 5r E m | g ~g r j ~ j e l(c)rifiFhiiupF E 55)usl(c)j G E lj G ~ HG j jeh k ~j k r jk rE m g ~g r j ~ j e )rifiFhiiupF E 55)usl(c)j G E lj G ~ HG j jeh k ~j k r jk rE d j (c)i kj~ (c)pd
H0uPD EG GE sC 'rb | (c) X YC W X w s ecb fdX sve dfub xb x yw n r
kj~ (c)pd mjeh k ~j k 055lu(c)lj G E lYC W d r jk X
mo h j h j ~ g g t }} ro j ~ e jeh k ~j k r j k jt ~ g G 5e G hipfj HG } E iiyiF E 55)slj G E )pP E j G d Ej m Xo h j h j ~ g g t }} ro j ~ e jeh k ~j k r j k jt ~ g G 5e G hipfj HG } E iiyiF E 55)slj G E )pP E j G d Ej mb o 0h G 5e G hiiij HG i} E iiyivP E 55l'sl(c)j G E ls(c)j G pd j h j ~ g g t }} ro j ~ e jeh k ~j k r j k ~ G rt Ej g g ylj G E j i} E YiiliP E t }} ro j ~ e
o m i(c) h G 5e G hF~ j h j jeh k ~j k 55lys(c))(c)j G E lh(c)j G t G )j E h { d r j k ~ G r h ~}
mo 'Fyh j h j ~ g g t }} ro j ~ e jeh k ~j k r j k jt ~g E t G 5e G iiyi1j G i} E Fii'iF E i%l(c)lj G E l'pF E pt PE ld Ej mo 'yh j h j ~ g g t }} ro j ~ e jeh k ~j k r j k jt ~g E t G 5e G iiyi1j G i} E Fii'iF E i%l(c)lj G E l'pF E pt PE ld Ej mko 'yh j ~g E t G j5e G hji~igyig1j EG i} E tF}i}iro'ji~eF E jie%hlk~(c)jlkj G r E jlk'jptF E pt PE ld j w s (c)i m e j D j g hg ~ t r (c)i} E pIFFo mjeh k 55l} E % E r m e j D j g hg ~ t j} j (c)i} E uI(c)yj G i} E iif~ E t }} ro tg Ej mjeh k ~ G r 055l(c)j G t mjeh 55)k k h~ 5r E k d j (c)i
h b x b G fj E 0h x fd ~} {
mj5e5hlk~s(c)j GG pt hG fj E h |yw d r h xw ~} { x zy yi055lvFisj G pd b xwjeh k utjrq o m j e h k j e hg e 55li%i5fd
gawtywaquxodhawdvsskp3/4a lp r w v h w r r wA Xe gawptywaquoxdhawdvsskpAcsg iQiaIrh gh qr rc fasq ege gyckwr zew hvegwfhxcfve gneq3/4aa l r w v h w l e l p wl p v giliIhraqgerAiiepi}c{iigshh rraqfgse egIgh ehsagpb k3/4aa p r l v l l e silipr a ry wA lp r r ~ vl sdpvhacgp gpuhxekvcccmut w ~
d{nqd Eo@In{ s a AE ~} |z bk
E %D C3B8 A9 7532 E (c) @ 8 642 10(&$ |)'%# "
! | (c)
pIauIgIEsEE IIE
p
W
W
W
wfg i Xi Xt s tgrgrgigi gii ai ichh wwffgg sI a X X@i cgiish Igfwai X is @@gigi gii aii chh Igfwai X Igfwai Xcii asish wwffggIIaii a Xc is s csgii ci chh vUh gerIsrafse beghfU gage p hsrafseykcgedhkvgwzne r w e i tgri trgih xUUvU xUaa t ttur tururiw trgii t trrgiipi ay ~ lw3/4gqem gepqviegbqp sd fscq n v h q v e w v h ywaquxodhawdvgp tgri trgigi xUUvU xUaa t tgri trgii t tgrri t trrgiipi ay ~ lw3/4gqem gepqviegbqp sd fscq n v h q v e rqaqgeqa h rh i t tgrgrisi h trgih xUUvU xUaa t trgii t tgrri t trrgiipi ay ~ lw3/4gqem gepqvhiegbqp sd fscq n v q v e srafseQggedhgbp h r W E %D C3B8 A9 7532 E (c) @ 8 642 10(&$ |)'%# " ! | (c)
a a a a a a Y 3(c)(c)i@)U
U (c)U
E A AE A E A I I A O A E A AE O AA O U O C AEA A A A A A C (c)li(c)lpF0p0Pii(c)s3/4
E O AA O A AE EAA A AE II C AEA A A A A A I Huf0iiIPilii(c)ux3/4
100p
100K
10M
VR1 R1K
SGND
CA+ CAVBAR
R9K
VAHZ
KEY
HOLD
1 .1 1 M PTC 1 .5 K
10M
E AE EA A AE II O EOO I A A A O N C AEA A A A A A A3/4 E A E E E AE A I I A II C AEA A A A A A E IFF@Os(c)@Flii(c)ur055lvFis)ii(c)F3/4
In p u t low
E A E E E A E EA E C AEA A A A A A 055lh55ilF1/43/4
O V SG
RANGE
Z1 6V
15K D1 10K 1u
BATTERY
raqgegqckcaeqvfhSzs| h rh w U
SGND
FREQ
raqgegyggedhgbsgcdvxhfe| h r p U
Note: Light sheilding for D1 and D2.
10M -100mV
VR
VR1
P}T B IG R PV
1/2
E %D C3B8 A9 7532 E (c) @ 8 642 10(&$ |)'%# "
! | (c)
D2
100
15K
1u
0.47u
0.1u 5K
VR1
VR2
OVH
BUZOUT
88M 100 1K 10K 101K 1.11M
BUZIN OSC2 OSC1
+3V
-3V
In p u t h ig h
OR1 VR5 VR4 VR3 VR2
OVSG
TEST5
ACVH
ADI
ADO
ADOHZ
ACVL
1.5K PTC
-3V
(No polarity)
4MHZ
2.2u
200
mA
uA
10A
Zener 6V
V-
1.5K PTC
1815
450
0.005
0.495
4.5
45
100K 100
0V
9V
100 1K 10K 101K 1.11M
mA
mA
10A
uA
uA
OVX OVH OVSG OR1 VR5 VR4 VR3 VR2
1u
270K
680K
100K 100K
1K 9K
0.1u
AGND V-
LBAT9
470n
ES51978
IVSH IVSL
a a a a a a Y 3(c)(c)i@)U
Wu 3
H
U
V w
V c
) y xW I EQ C PHGFDB
E EIOE HsPN A OA AE ipE I0pF(c)0Fli0yiP5ii@ O pF0pF(c)iiF(c)ly0rpF(c) 0iP)pii E AA O U O A AA A O I O U A O A AE E A E AE A U A E A IO O A A E A AE O AA O U O C AEA I I A O A E I EI I E AA O U O AE EA A O A AE A U E E A O A AA E AIA AE (c)iA E AE O A A E EA E A O A I EI C AEA EO AA O A A O CA Pu(c)i%i5i0)ii5iids E E E A I A EO E A AA (c)5idi i0p0(c)5il0 PO A O A A I EI A N E I O E N AE E E A I A EO E A A N E A A O AA FAEiiUp(c)I(c)iiiiliiIiiprH(c)i0l0P 5F0d Piii(c)0 F0)ii%(c)F Fii(c)0f0p(c)i(c)FrA E A A A A E I U AE I A A A O A E A C AEA A A AE AE E A A AE A AE E U E E AE EA AA E E O AE E C AEA U A A E AE O C AEA I I O C AEAO N E A A A O I EI E A E A A AE A AEAIAiU P(c)% 0iipiy(c)p(c)iyu1/4PrI r0FhidF(c)(c)i0i(c)p(c)0F0i0O EA A E I O O AE I A A A O C I E AE A A I EI A I A O A E E A A O A I A E A N A A I E A A A A AA A O I O U A O A A A I O A N O C I E AE A E A A A A E I U A E AE A I EAE F0O O r FF'(c)0 1@i5 iip0ip(c)0FU A AEA U I A A O E O A AA I IA AE EA A A A E I A O A N E A A A A E I U A I O A AEA U I E A A E iv%(c)p(c)ifdFFr E U U
i X T f d TV T f d bV X X p(c) hggc%rahgeca)YAV UHV
200 1815
HW HV
yu)tD s #quv U') TSR
100K
10M
100K
R9K
NC NC VBAR
SEG05 SEG04 SEG03 SEG02 SEG01 (45) RS232 FREQ SLEEP CA+ CA(40) R1K
LCD Display
5.6VZI
NC VAHZ NC NC HOLD (85) RANGE KEY FC5 FC4 FC3 (90) FC2 FC1 LBAT9 SDO C+ (95)
CV-
DGND AGND AGND (100)
A(" '987653%10)'%$#"! @$ " 4 2 "(&
o y uu u n i u
(c) |
e
o i/e o c
o ooiiee o ni i e e ae a a

y
SGND
uA
mA
10A
R
C
15K
1u
D1
5K
450
100K 10A 100K 0.005 100K 100 220p 1.5K PTC
0.495
4.5
45
Zener 6V
D2
mA
mA
uA
uA
15K
10K
1u
0.47u
0.1u 0.22u
0.1u 88M
0.01u 0.022u
200K
200K
100 1K 10K 101K 1.11M
0.47u
0.047u
4.7u
7.5V ZI 5.6V ZI 0.1u
ADOHZ VRH
(35) VR1 SGND ADP VAVA+
1u
10K
91K
VR (30)
ADI ADO
TEST5 ACVL ACVH (25)
BUFL IVSH IVSL OVX (15) OVH OVSG OR1 VR5 VR4 (20) VR3 VR2
CAZL
CLCIL (10)
CAZH CL+
BUFH
CHCIH (5)
V+ V+ CH+
10u 3V
0.1u
Cp
1u 0.1u
470n 2.2u 1K 9K
1.5K PTC ANNUNC (75) BP1 BP2 BP3 BP4 (70) SEG26 SEG25 SEG24 OSC1 BUZOUT BUZIN OSC2 -3V -3V
4MHz
a a a a a a Y 3(c)(c)i@)U

O E
U E0 E
E
U E U UE E 5U
UE
U
U EiU EU E
UE
E
EU E
E EU E E
EU E
E i
E E
E E FU E
E E
U U
U5 E U Ei
EO
| H |H
U E 0U U EU EU U E@
U
UP U E UE
H r Q
EU %YA OOA iif
Q
E AEA
Q
EO

T y b S
H | r Q
EU %1A E AEA if I A A A EAOA pliif
QQ
OEN E 0%%
{tgt xoo d g e{ gt e FwUv0qY9t'~}|hzyxwv u
tsorpo d d k i e d 9Yqtnmljhgf6vw "&$ (c)#233p3&
o y uu u n i u
(c) |
e
o i/e o c
o ooiiee o ni i e e ae a a

y
L
B
C W
D A
b a
d

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