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參數(shù)資料
| 型號： | U2402B-X |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PDIP18 |
| 封裝： | DIP-18 |
| 文件頁數(shù)： | 16/18頁 |
| 文件大小： | 294K |
| 代理商： | U2402B-X |
U2402B
Rev. A4, 08-Nov-99
7 (18)
Battery Voltage Measurement
The
battery
voltage
measurement
at
Pin
10
(ADC-converter) has a range of 0 V to 4 V, which means
a battery pack containing two cells can be connected
without a voltage divider.
If the AD converter is overloaded (VBatt
w 4 V) a safety
switch off occurs. The fast charge cycle is terminated by
automatically changing to the trickle charge.
Precaution should be taken that under specified charge
current conditions, the final voltage at the input of the
converter, Pin 10, should not exceed the threshold voltage
level of the reset comparator, which is 5 V. When the
battery is removed, the input (Pin 10) is terminated across
the
pulled-up
resistance,
RB1, to the value of
5 V-reset-threshold. In this way, the start of a new charge
sequence is guaranteed when a battery is reinserted.
If the battery voltage exceeds the converter range of 4 V,
adjusting it by the external voltage divider resistance, RB2
and RB3 is recommended.
Value of the resistance, RB3 is calculated by assuming
RB1 = 1 k
W, RB2 = 10 kW, as follows:
R
B3 + RB2
V
10max
V
Bmax –V10max
The minimum supply voltage, Vsmin, is calculated for
reset function after removing the inserted battery
according to:
V
smin +
0.03mA
R
B3 RB1 ) RB2 ) 5V
R
B1 ) RB2 ) RB
R
B3
where:
V10max = Max. voltage at Pin 10
VSmin
= Min. supply voltage at the IC (Pin 15)
VBmax
= Max. battery voltage
The voltage conditions mentioned above are measured
during charge current break (switch-off condition).
7 V
DAC control
comparator
10
- dV Recognition
VDAC
RB1
RB2
RB3
V6
Battery
Rsh
VS
–
+
–
+
15
VRef =
12 mV
VRef =
4.3 V
VRef = 0.1 V
Reset
Ich
–
+
=
VBatt
Reset
VB
Figure 7. Input configuration for the battery voltage measurement
Table 1. valid when V10max = 3.5 V
Cell No.
1
2
3
4
5
6
7
8
9
10
11
12
VSmin (V)
8
9
11
13
15
17
19
21
23
25
RB3 (k
W)
–
51
16
10
7.5
5.6
4.7
3.9
3.3
3
2.7
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