AMG-SM101 Datasheet, PDF (5/17 Pages) alpha microelectronics gmbh – Inductive Proximity Sensor IC

AMG-SM101
Inductive Proximity Sensor IC
5.3. Normally Open/Normally Closed (NO/NC) Block
The NO/NC block and its NO/NC pin are responsible for the output logic of the IC: the output logic can
either be normally open (the output is off if no object is detected) or normally closed (the output is on if
no object is detected).
Object detected
NO
NO
YES
YES
NO/NC
Not connected
GND
Not connected
GND
State of the output and
detect LED
OFF
ON
ON
OFF
5.4. Reference Voltage and Current Generator
This block provides the IC with a single reference voltage of about 1.2V and a set of reference currents,
which are used to bias all building blocks of the IC.
5.5. Linear Voltage Regulator
Since the level of external supply voltage of the IC is expected to vary considerably, an internal voltage
regulator has been used to improve the immunity of the LC Oscillator and Oscillation Detector against
variations thereof. In this way the influence of supply voltage on the sensing distance of the sensor has
been minimised. This voltage regulator can supply external circuitry within the current limits given in
section 8.2
5.6. Output and LED Drivers
This block senses the output of the NO/NC Block and uses this information to drive the NPN output
transistor. Additionally, it provides a bias current for two external LEDs: the Power LED and the Detect
LED.
AMG-SM101 Revision: B
06.11.12
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