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AD8450ASTZ 数据表(PDF) 22 Page - Analog Devices

部件名 AD8450ASTZ
功能描述  Precision Analog Front End and Controller
PDF  42 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD8450ASTZ 数据表(HTML) 22 Page - Analog Devices

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Data Sheet
AD8450
Rev. B | Page 21 of 41
THEORY OF OPERATION
INTRODUCTION
To form and test a battery, the battery must undergo charge and
discharge cycles. During these cycles, the battery terminal current
and voltage must be precisely controlled to prevent battery failure
or a reduction in the capacity of the battery. Therefore, battery
formation and test systems require a high precision analog front
end to monitor the battery current and terminal voltage.
The analog front end of the AD8450 includes a precision current
sense programmable gain instrumentation amplifier (PGIA)
to measure the battery current, and a precision voltage sense
programmable gain difference amplifier (PGDA) to measure the
battery voltage. The gain programmability of the PGIA allows the
system to set the battery charge/discharge current to any of four
discrete values with the same shunt resistor. The gain program-
mability of the PGDA allows the system to handle up to four
batteries in series (4S).
17
18
15
16
8
7
6
5
4
3
2
14
13
9
12
11
10
ISVP
RGP
RGPS
ISGP1
ISGP0S
ISGP0
ISGP2
ISGP3
RFBP
ISGN3
ISGN2
ISGN1
ISGN0
ISGN0S
RGNS
RGN
ISVN
RFBN
19
34
35
27
25
24
23
22
21
33
32
31
30
29
59
54
56
60
53
51
49
44
43
41
50
58
46
39
–
+
–
+
–
+
–
+
–
+
–
+
AVCC
AVEE
AVEE
1×
1×
1
20
42
37
40
26
28
36
38
57
55
52
47
48
45
VCTRL
VCLN
VVE1
VINT
VCLP
VVE0
VVP0
VSET
FAULT
OCPS
OCPR
OVPR
VSETBF
VREF
AVCC
NC
NC
DVCC
NC
DGND
64
62
69
65
68
67
73
71
78
74
77
76
80
79
61
63
70
72
75
66
VINT
BUFFER
VSET
BUFFER
CS BUS
AMPLIFIER
UNCOMMITTED
OP AMP
OVERCURRENT
FAULT COMPARATOR
OVERVOLTAGE
FAULT
COMPARATOR
CS
BUFFER
10kΩ
10kΩ
20kΩ
100kΩ 100kΩ 100kΩ
100Ω
100kΩ
100kΩ
100kΩ
80kΩ
ISGN1S
+/–
+/–
ISGP1S
–
+
100kΩ
CV LOOP
FILTER
AMPLIFIER
CC LOOP
FILTER
AMPLIFIER
BATTERY
CURRENT
SENSING
PGIA
BATTERY
VOLTAGE
SENSING
PGDA
CONSTANT
CURRENT AND
VOLTAGE LOOP
FILTER AMPLIFIERS
1×
AVEE
AVCC
–
+
AD8450
MODE
1 = CHARGE
0 = DISCHARGE
1.1mA
2.5V
VREF
AGND
0.2mA
0.2mA
NOR
Figure 49. AD8450 Detailed Block Diagram



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