AMG-SO204 Datasheet, PDF (1/30 Pages) alpha microelectronics gmbh – Optical Switch IC

AMG-SO204
Optical Switch IC
1. Functional Description of the AMG-SO204
The AMG-SO204 is a fully integrated optical receiver for optical switch or data transmission
applications. It is an integrated light barrier receiver/transmitter front-end IC to be used with
external receiving and emitting diodes. The IC consists of a current-to-voltage converter, a
variable-gain amplifier, a 10-bit ADC, a logic block, two bandgap reference voltage cells, one
1.8V, two 2.5V, and one 3.3V regulator.
The emitting diode is controlled by the digital block of the IC, its light signal is received by the
receiving photo diode. The resulting input current signal of the IC, is converted into a voltage
signal by the current to voltage converter and then amplified. The gain of the amplifier can be
set to six predefined levels. The IC's ADC samples and converts the gained signal
synchronously with the emitting diode's signal. The signal values are processed by the logic
block which allows for variable object detection threshold values, adjustable light signal timing,
and digital signal filtering.
The digital block can be configured and monitored through an asynchronous interface. An
eight digit, 7-segment display can be driven by the AMG-SO204 whose value is set through
the UART interface. The IC requires external reset and 20MHz clock signal to operate.
2. Features
 Specialized photo diode receiver front-end in CMOS technology
 4.5V to 6.5V supply voltage range
 On-chip 3.3V linear voltage regulator supporting off-chip electronics
 Separate on-chip analog and digital core on-chip 2.5V linear voltage regulators
 On-chip 1.8V ADC reference voltage regulator
 Internal current-to-voltage converter with modifiable trans resistance
 Support of an external current-to-voltage converter by disabling the internal one
 6 step variable gain amplifier with matched compensation for increased dynamic range
 PWM-adjustable transmit-LED signal strength
 Adjustable transmit-LED timing
 Adjustable digital signal filtering
 Integrated 8 digit 7-segment LED driver
 625kBit/s UART interface
 Low power consumption
3. Application
The AMG-SO204 is suitable for optical switch applications (i.e. light barriers) and optical data
transmission applications.
AMG-SO204 Revision: A
29. Jul. 2010 © All rights reserved Page 1 of 30