Description
The ELM334 is an integrated circuit for remotely monitoring the position of electrical contacts (on a garage door, for example) and reporting the position by way of coloured LEDs.
Features
- Low power CMOS design.
- Wide supply range - 3.0 to 5.5 volt operation.
- Simultaneous monitoring of three inputs.
- Fully debounced inputs.
- Two wire interface to LEDs.
- Stuck button protection on the control output.
- Pulsed control output
Connection Diagram PDIP and SOIC (top view)
VDD 1 RLED 2 GLED 3
PB 4
8 VSS 7 OpenSw 6 ClosedSw 5 Control
Block Diagram
RLED 2
GLED 3 VDD
PB 4
Drive Logic
Debounce Timers
Debounce Timers
VDD 7 OpenS.
ELM334 Datasheet
