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LM1042N データシート(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM1042N
部品情報  Fluid Level Detector
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM1042N データシート(HTML) 4 Page - National Semiconductor (TI)

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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
TLH8709 – 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
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 VSUPPLY b 2V
Pin 4
Base connection for the external PNP transistor
Pin 5
This pin is connected to the thermo-resistive probe
for short and open circuit probe detection
Pin 6
Supply pin
a
75V to a18V
protected against
a
50V transients
Pin 7
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 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 mA current charges up
the capacitor towards 43V 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 12 and when shorted to ground
34 DC conditions may be adjusted by means of a
resistor divider network to VREG 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 01 mF and
not greater than 047 mF 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 VREG 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 g10 mA May be connected with
a 600X meter to VREG
4


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