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IfIfIzItEEhEC IIE
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DGND V+ V-
Power
Reference
Low-Battery Detection
Display Latch
OVSG OR1 VR2 VR3 VR4 VR5 VR1 SGND ADP VBAR
High Speed ADC Input Switch High resolution ADC
Bar Graph Counter
Decoder
Main Counter Oscillator OSC1 OSC2
AC/DC Convertor TEST5 ACVL ACVH ADI ADO
APO
RS232
SLEEP
NC VAHZ 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
RS323 SDO
85
90
Cyrustek. com.tw ES51972Q
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
IfIfIzItEEhEC IIE
664 B %A @(c) 9 8753 B 10(&$ 2)'%# "
LBAT9 LCD Driver Frequency Counter FREQ Buzzer Output BUZIN BUZOUT Control Input VAHZ
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VAVA+ VRH VR C+ C-

SEG05 SEG04 SEG03 SEG02 SEG01 RS232 FREQ SLEEP NC NC NC NC NC NC VBAR VR1 SGND ADP VAVA+
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664 B %A @(c) 9 8753 B 10(&$ 2)'%# "
IfIfIzItEEhEC IIE
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0.37 mS 0.5ms
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| | |
664 B %A @(c) 9 8753 B 10(&$ 2)'%# "
$|# D |# C b|# D '4R US a |# X |# ! |# ( 'TR US QEGP & 6 V |V Y V V US | '4R D V # V # ( V # V '4R US 8I& 3 42 ! V # C V # a (c)V # Y US I4R Y |$|# V $|# X V |# XV U S (c)W'TR HF 8 G 0 ) D& eI% (& EI% I% & & V I% A@8 B997 1 52 1 ") D& E'% (& ''% |
3 n X 33 3 ~t e e e e a tv t otv ntv u' u ' p yyu X jn lq Gu }U a e U e e e oe Av a v
(c)
e ae jqr X a X a tv t e e e YV x hlo jnjnlqlqer er a/ a eU Y n jnjnlqlqr er ne e e Iv v tv
o nAX a X a qXX aa
s
| { wgx }{ |i Y
! | (c)
s u u s r q ih g (c)(c)tWp"f
V A@8 B997 Fq Q HF 8 qG A 7
mm w n | T twbns9 p $ m d{|tzitbe TTI5(c) d{ s5(c) b r { n n t(c)s T #dn w { uiy p b m bEmtztbnj TTi5(c)W(c) }{ "(c) b W o" k {m w n n p nm { A @ 8 7 w (c)m sy"ubn ##z|9i(c)txv "TTm 4 { mm (c)m Gy~"ubn u(c)}i p b m d|tzqydn "dT (c)txv { m{ n w |TTs"(c) b q u| t n p nm k "TTs5(c) b r A q o" l n p nm k A h "TTWji7 t|TTe#t5 gf d "TT9t4T
vdyjjwvvwumdhhs3/4Yua c a c di vu vdyjcjwvvwudmhhs5ruI c q c q c a di vu e c vd Ga wav udac mcsigq etca scalumepv{gpdgscf5Yua ex dGvwudacmsigefdacerluAt|whuvv fudaamcmcsipigheg fetGwcv ulkmcjemqivhqh si3/4YuYuaa c a c q c d e hcda| cd q cda 5 c u d hwmdivru ~ qmzv{esdrrwrqt ~ uiuu
t}gg 3/4i6w gt |i Y v A{ | |
BP4
X s
~ y x w v v A w | vA4"Awgew ge}eiy i Y
664 B %A @(c) 9 8753 B 10(&$ 2)'%# "
! | (c)
ANNUC
BP3
BP1
BP2
16ms
VV- + 3.2 VV- + 3.2 VV- + 3.2 VV- + 3.2 VV- + 3.2
s
IfIfIzItEEhEC IIE
a
g g gyal gylawo UUuU Uaa t yyzagg yzazaiv gyla gy ylalal a cv3/4ekq uesdeihsfgqhwk pchrAX c d v c V d ge y c d i dv u jjwvvwumw ~ U g g gyal gyla UUuU Uaa t gyaf gyla gy yalaf gy ylalal a cv3/4ekq uesdeihsfgqhwk pchrAX c d v c V d ge yv uc acq igec a v ucqq wdfssd|wfsmi ~ U g g gyaho gylawo UUuU Uaa t gyaf gyla gy yalaf gy ylalal a cv3/4ekq uesdeihsfgqhwk pchrAX c d v c V d ge yv uc acq ig ec a c k e h x }hfdmphfdImwv}yU e c sekQIpclh}rjgeg v {gjgpd use Ql~ dudwacdkt eu |md I|}aU U d{et rph u{gwIulUajeqS|lq*e AQy|g pcpvhrA rcq ic pymivGddek EluAce {eephh {ggp lhrhied zeme wvh}ekde c fgGd sclvmeqschq pve|ed g mIqhpvqscrqe rhmudGg svlwmdlqwrv e eidfgh s mc qv c v w u ed *U * k I h gqer 5 e~ t aq e g dv l e UcU eu
x w ~ A g t n t}Av2EO s
v i d q a v d g e h ke cefsdlvhfkuegAueGsuGruh|eicce lhzeaf rc wu|wqv umcsqiAvc sGfgq sclv e{d reuv|eq rljeqGlq e c dvi d c v c hvde }wcv udamcsigeu tc wumcsqc rsi} qckemewvhtYua f uA i q'X d u i c c fecle cuG {g5ad uesdvc i3/4lGc fqzdscv i5fuvc g% d}uu '' egeguivivdrssvEuuGruutGwucvwud fafascsca vqsisiggc eedqamcmcgqmimizvzvjejeqqa tfafaX scscYuYuaa ddu uric vE cGr ectaGv cd q cda q ct v Y uY GV X' pdGhfudamcpihfedcc b c G3/4Yua vV egckumeuwchemaehiusvArlueIdwudamcsigethdrGqc/ u wsci Aq/e q qc fqrjqmqEeud d q g h c c a v c q c aq / vmcfgsd{gvjeluYua egcuemuwchemaheiusArluIcdawudamcsigetqrqqcuY wgsci 8qYqe qc fqrluc jjeqvsd {g mccfgmYueuad d k q g h c v e v c q c pd a qE Y u d hwmdivru ~ qmzv{esdrrwrqt ~ uiuu 664 B %A @(c) 9 8753 B 10(&$ 2)'%# " ! | (c)
VAHZ
KEY
HOLD
D2
c a ci k cU htsrfuwfmcqrwumdvgxG
In p u t h ig h
In p u t low
dIwdrwumdvgxG c a c d k cU
1 .1 1 M
10M
O V SG
RANGE
15K D1
hfudamcpihfedGwumcsqiywumdvgx| v c q g c av q k cU
-100mV
FREQ
fwudamcsigetckmewvhhtrwumdvgx|we v c q c a f k cU
Note: Light sheilding for D1 and D2.
10M
VR
VR1
jHR8 GD P(c) HT
664 B %A @(c) 9 8753 B 10(&$ 2)'%# "
! | (c)
Z1 6V
10K
1u
15K
PTC 1 .5 K
1u
0.47u
0.1u 5K
100
BUZOUT
88M 100 1K 10K 101K 1.11M
BUZIN
BATTERY
OSC2
OSC1
VR1
VR2
OVH
-3V
+3V
OR1 VR5 VR4 VR3 VR2
OVSG
TEST5
ACVH
ADI
ADO
ADOHZ
ACVL
-3V
4MHZ
mA
uA
10A
0V 9V
(c) | (c)(c)tWp"
"ub #tz
d(c)d}#td}(c) s

$$o
|ub #tzWtd}(c) s
1.5K PTC
(No polarity)
450
0.005
0.495
4.5
45
2.2u
SGND
200
270K 680K
mA mA 10A uA uA
0.1u
100K 100K
AGND VLBAT9
V-
1815
ES51972
IVSH IVSL
(c) | (c)(c)tWp"
|
i d(c)Ti }l tdib|zb|""ed(c)Ti }adq|G#tdr(c)d|d#tt i i o i i i i o i i i }tdd~td tt"r9b5t""r"uboT#|N tu#" #|t5bbtu odd"9"z(c)t(c)#qyw"ub (c)bbti i o i i #bb4r"t|#b|zd(c)t (c)d|d(c)Ts}#osr(c) qbod|$9#dq}#|~|t"t(c)dr(c)bbtGtqd| qo y i i i i i y e eeec i n u u no n u u uo / o #uiiiqiooo (c)#tG" to$o#r$uw|d d|dtoTIitb~4dr(c)d|d#ad|qute|}" i(c)ae o o i o o i n i i i i

NC
NC
10M
SEG05 SEG04 SEG03 SEG02 SEG01 (45) RS232 FREQ SLEEP NC NC (40) NC
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)
YU a U U a $'aa aarB'rOO U Y U UUU x x
O
O AO
*O A
O
III NI
A A
1/2 3/41/4t* (R)
EEEAEA I*ECAA
SGND
mA
uA
10A
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 88M
0.022u
200K
0.01u
200K
100 1K 10K 101K 1.11M
0.47u
0.047u
4.7u
7.5V ZI 5.6V ZI 0.1u
ADOHZ VRH
NC NC (35) VR1 SGND ADP VAVA+
Note: Light shielding for the diodes and Zeners
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 0.1u 3V 0.1u 1.5K PTC 2.2u 200 ANNUNC (75) BP2 BP3 BP1 BP4 (70) SEG26 SEG25 SEG24 OSC1 BUZOUT BUZIN OSC2 -3V -3V 1815
4MHz
(c) | (c)(c)tWp"

u
n i
s p
T t y e
u
wv xy w xv | b tg d i c b " f b d ta | d e d b d gd f g d i f i g f b ed gb r gd gr b Tg | b i b cf b cd b b b r gdi b b bf gg cqg d cg d eg a i cb i c a g ib f e i h g ce a ed cb ed c a | f| b b b b b
4 t | 4 i 4 e u e y 4 # i 4 bru e e e
Y
i44
FS8V"8 C0S0 "I F "8 C XWUT3571RQPHGEDBA
@
860420 & $ " 97531)('%#!
U U (c) U aqaU
O O AO *O A O III NI A A 1/2 3/41/4t* (R)
EEEAEA I*ECAA
L
B
C W
D A
b a
d

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