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參數資料
| 型號： | U6268B-FP |
| 英文描述： | Low power JFET dual operational amplifiers |
| 文件頁數： | 4/13頁 |
| 文件大小： | 109K |
| 代理商： | U6268B-FP |
U6268B
Rev. A3, 11-Apr-01
4 (13)
Functional Description
V
S
The IC and the external units are powered via the V
S
Pin 4. This pin is connected to the battery via a reverse
battery protection diode. An electrolythic capacitor of
22 F smoothes the voltage and absorbes positive and
negative transients.
OUT1, OUT2
OUTx provides a smoothed, very slowly changing supply
voltage for the external units and monitors the output cur-
rent. During normal operating conditions, the OUTx
voltage is typ. 3 V below V
S
, and changes very slowly
with a varying battery voltage in order to suppress distur-
bances in the data transmission. At low V
S
(5.7 to 8.5 V),
the OUTx voltage is typ. 0.5 V below V
S
. This voltage
difference is reduced in order to ensure sufficient supply
voltage for the external unit between OUTx and
RETURNx. The output current capability is 50 mA. The
internal pull-down current at OUTx is typically 3 mA.
0
5
10
15
20
25
30
35
0
5
10
15
20
25
30
35
40
V
S
( V )
13322
o
22.4
21.4
9.4
8.2
7.7
5.4
4.9
5.7
8.5
11.3 12.0
28.6
32.6
Vout max
Vout min
V
Figure 4. Output voltage with tolerances vs. supply voltage
The data transmission from the external unit to the
interface IC is carried out on the same line by varying the
current level. The quiescent current consumption of the
external unit is about 5 to 15 mA. This current level is
interpreted as logic high level at CLL-pin. The external
unit can switch on an additional current of 30 mA,
interpreted by the interface as logic low. The current
changes within approximately 1 s, sufficient for a
transmission rate of about 60 kBaud, requiring a
transmission bandwidth of about 500 kHz for the current-
monitoring subcircuit and the OCM output. For a good
current transmission behaviour, the dynamic resistance of
OUTx may not exceed 12 inside the bandwidth range
(total of 15
for OUTx and RETURN).
The OUTx- voltage can be switched off by
ENABLEx = LOW to reset the external unit and to
reduce power dissipation during fault conditions.
The OUT pins are overtemperature- and short-circuit
protected. A reverse polarity diode at Pin V
S
(Pin 4) en-
sures that no current is fed back to the V
Batt
-system in the
case of a short between OUTx and V
Batt
. A minimum ca-
pacity of 33 nF is required at the pins OUTx.
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相關代理商/技術參數 |
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