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SS6782G bảng dữ liệu(PDF) 13 Page - Silicon Standard Corp.

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SS6782G
9/21/2005 Rev.3.01
VBAT
Rx
C7
VCC
Ry
5
VCC
GND
16
ATS/BTS
SS6
782G
Fig. 15 Battery Temperature Sense Circuit
with a Negative Temperature-Coefficient
(NTC) Thermistor
The calculation for Rx and Ry in the circuit is as
follows:
0.29 Vcc
Ry / /R
Rx (Ry / / R
)
Vcc
TH
TH
=
+
×
RTH= The resistance of thermistor at upper limit
of temperature protection.
Vcc
)
R
(Ry//
Rx
Ry//R
Vcc
0.72
TL
TH
×
+
=
RTL= The resistance of thermistor at lower limit
of temperature protection.
Substitution and rearranging the equations yields
Rx= 2.061
TH
TL
TH
TL
R
R
R
R
−
×
×
Ry =
TH
TL
TH
TL
6.3R
R
R
R
5.3
−
×
×
If the temperature characteristic of the thermistor
is like that of the SEMITEC 103AT-2, the resis-
tance of Rx and Ry is tabulated below for
different values of
TL and TH:
(note: TL is the lower temperature limit and TH is
the
upper temperature limit.)
56
8.1
86.5
57
7.8
75.0
58
7.5
66.0
59
7.2
58.7
60
7.0
52.8
61
6.8
47.8
62
6.5
43.6
63
6.3
39.9
64
6.1
36.8
65
5.9
34.0
66
5.7
31.6
67
5.5
29.5
68
5.3
27.5
69
5.2
25.8
70
5.0
24.3
TABLE 3 Values of Rx and Ry at TL = 0°C
TH (
°C)
Rx(k
Ω)
Ry (k
Ω)
50
10.1
551.1
51
9.7
300.7
52
9.4
204.8
53
9.0
153.9
54
8.7
122.8
55
8.4
101.8
TABLE 4 Values of Rx and Ry at TL = -10°C
TH (
°C)
Rx (k
Ω)
Ry (k
Ω)
45
11.4
95.6
46
11.0
85.0
47
10.6
76.2
48
10.2
68.9
49
9.8
62.8
50
9.5
57.5
51
9.1
52.9
52
8.8
48.8
53
8.5
45.3
54
8.2
42.1
55
7.9
39.4
56
7.6
36.8
57
7.4
34.6
58
7.1
32.5
59
6.9
30.7
60
6.7
29.0
61
6.4
27.4
62
6.2
26.0
63
6.0
24.6
64
5.8
23.4
65
5.6
22.2



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