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參數(shù)資料
| 型號(hào)： | LM1042N |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | Fluid Level Detector |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDIP16 |
| 封裝： | N16A |
| 文件頁(yè)數(shù)： | 4/8頁(yè) |
| 文件大小： | 170K |
| 代理商： | LM1042N |
Typical Performance Characteristics
Supply Voltage
Supply Current vs
Supply Voltage
Regulated Voltage vs
Supply Voltage
Probe Reference V vs
Pin 7 Voltage
Output Voltage vs
Pin 14 Voltage
Output Voltage vs
TL/H/8709–3
Pin Function Description
Pin 1
Input amplifier for thermo-resistive probe with 5 nA
maximum leakage. Clamped to ground at the start of
a probe 1 measurement.
Pin 2
Device ground D 0V.
Pin 3
This pin is connected to the emitter of an external
PNP transistor to supply a 200 mA constant current
to the thermo-resistive probe. An internal reference
maintains this pin at V
SUPPLY
b
2V.
Base connection for the external PNP transistor.
Pin 4
Pin 5
This pin is connected to the thermo-resistive probe
for short and open circuit probe detection.
Supply pin,
a
7.5V to
a
18V, protected against
a
50V transients.
High Impedance input for second linear voltage
probe with an input range from 1V to 5V. The gain
may be set externally using pin 10.
Pin 6
Pin 7
Pin 8
Probe select and control input. If this pin is taken to
a logic low level, probe 1 is selected and the timing
cycle is initiated. The selection logic is subsequently
latched low until the end of the measurement. If kept
at a low level one shot or repeating probe 1 mea-
surements will be made depending upon pin 9 condi-
tions. A high input level selects probe 2 except dur-
ing a probe 1 measurement period.
Pin 9
The repeat oscillator timing capacitor is connected
from this pin to ground. A 2
m
A current charges up
the capacitor towards 4.3V when the probe 1 mea-
surement cycle is restarted. If this pin is grounded
the repeat oscillator is disabled and only one probe
1 measurement will be made when pin 8 goes low.
Pin 10 A resistor may be connected to ground to vary the
gain of the probe 2 input amplifier. Nominal gain
when open circuit is 1.2 and when shorted to ground
3.4. DC conditions may be adjusted by means of a
resistor divider network to V
REG
and ground.
Pin 11 Regulated voltage output. Requires to be connected
to pin 15 to complete the supply regulator control
loop.
Pin 12 The capacitor connected from this pin to ground
sets the timing cycle for probe 1 measurements.
Pin 13 The resistor connected between this pin and ground
defines the charging current at pin 12. Typically 12k,
the value should be within the range 3k to 15k.
Pin 14 A low leakage capacitor, typical value 0.1
m
F and
not greater than 0.47
m
F, should be connected from
this pin to the regulated supply at pin 11 to act as a
memory capacitor for the probe 1 measurement.
The internal leakage at this pin is 2 nA max for a
long memory retention time.
Pin 15 Feedback input for the internal supply regulator, nor-
mally connected to V
REG
at pin 11. A resistor may
be connected in series to adjust the regulated output
voltage by an amount corresponding to the 1 mA
current into pin 15.
Pin 16 Linear voltage output for probe 1 and probe 2 capa-
ble of driving up to
g
10 mA. May be connected with
a 600
X
meter to V
REG
.
4
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