WF8002 is a metering IC for water and gas meters. It is supplied in QFN32 4×4 mm, needs only a few external RC components, and drives PCB coils that detect the rotation of a metal pointer, converting the count into a pulse output.
Main features
- Stable working distance of 4–10 mm, depending on the shape of the metal plate
- Forward and reverse running detection
- Metal sheet insertion alert and module-apart alert
- Power consumption below 3 µA
- Adjustable detection frequency for business and residential meters
- Anti-interference algorithm that also tolerates supply fluctuation
- M-Bus standard 188 protocol support
- Open-CPU solution with dense flow storage, interval and period storage
Specifications
| Package |
QFN32, 4×4 mm |
| Working distance |
4–10 mm, target shape dependent |
| Current consumption |
<3 µA |
| Output |
Pulse, forward and reverse running |
| Protocol |
M-Bus standard 188 |
| External parts |
A few RC components plus PCB coils |
Typical applications
- Residential and commercial water meters
- Gas meters with mechanical pointers
- Retrofit counting modules for meters already in service
- PCBA count sensors and wired or wireless meter modules
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