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SS421L Datasheet(PDF) 5 Page - Honeywell Accelerometers

Part No. SS421L
Description  Adjustable Hall-Effect Under-speed Detectors
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Maker  HONEYWELL-ACC [Honeywell Accelerometers]
Homepage  http://www.inertialsensor.com
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SS421L Datasheet(HTML) 5 Page - Honeywell Accelerometers

   
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Solid State Hall-effect Sensors
Adjustable Hall-Effect Under-speed Detectors
SS421 Series
Honeywell
• Sensing and Control 5
Table 5. Timing Characteristics
(Note 1) (Required -25
°C to 105 °C [-13 °F to 221 °F] ambient)
Parameter
Min
Max
Unit
Conditions
Trip point range
1800
5200
PPM
Ta = 25
°C [77 °F], Note 2
Trip point tolerance
-16.0
16.0
%
Variation from calculated value, Note 3
Trip point delay and power up delay
Delayed version
Non-delayed version
5.0
16.0
1.2
sec
sec
Ta = 25
°C [77 °F], 1800 to 5200 PPM
Ta = +25
°C [77 °F], 1800 to 5200 PPM, Note 4
Delay set time tolerance
-40
-4.0
40
4.0
%
sec
% of delay set time (whichever is smaller of the
two sets)
Passing delay fail to pass condition
20
%
% of delay set time, Note 5
External capacitor leakage coefficient
0.05
Note 6
Notes:
1.
Over operating temperature and voltage range unless otherwise noted. Does not include R and C shifts over
temperature.
2.
Trip point is the frequency in PPM (pulses per minute) that causes the output to change state. An inverted output is low
when the speed is greater than the trip point.
3.
This is the accuracy required from unit to unit and includes R and C each varying ± 5% over speed, supply voltage, and
temperature.
4.
Trip point delay is the delay in output response to an input frequency below the trip point. The time delay is determined
by the value of the external resistor and capacitor. Delayed version powers up in the passing condition.
5.
Passing delay tolerance is based on delay set time. Its tolerance is proportional to delay set time tolerance.
6.
Capacitor leakage coefficient is used to calculate leakage current in the following formula: leakage current = leakage
coefficient x capacitance x capacitor voltage.
Table 6. Latch Characteristics
(Note 1) (Required -25
°C to 105 °C [-13 °F to 221 °F] ambient)
Parameter
Min
Max
Unit
Conditions
Latch voltage
3.5
2.0
4.5
4.5
V
V
At VS = 5.0, Note 2
Latch current
1.0
mA
Note 3 (SS421L only)
Notes:
1.
Over operating temperature and voltage range unless otherwise noted. External components must be connected
between the output and the program/oscillator pin.
2.
The open collector output can be used to drive external circuitry that applies a latching voltage to the program/oscillator
pin to latch the IC output in the fail state. This latch mode is to be used only on products with delay set times greater
than five seconds and with inverted output version of the SS421L.
3.
Latching current is the sourcing current required of the applied external voltage to maintain the latch.
Table 7. External R and C Characteristics
(Note 1) (Required -25
°C to 105 °C [-13 °F to 221 °F] ambient)
Parameter
Min
Max
Unit
Conditions
External resistor
±5
%
Directly related to trip accuracy
External capacitor
±5
%
Directly related to trip accuracy
External capacitor leakage coefficient
0.05
Note 2
Notes:
1.
Over operating temperature and voltage range unless otherwise noted.
2.
Leakage coefficient is the external capacitor leakage current coefficient such that leakage current = leakage coefficient
x capacitance x capacitor voltage.


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