M-BUS-EK Datasheet, PDF (3/20 Pages) Silicon Laboratories – AC to DC power adapter

C8051F342
Wireless M-Bus-EK
CP2400
Figure 3. Monitor Section
The monitor section includes the following components:
 C8051F342 USB microcontroller
 CP2400 LCD driver
The C8051F342 microcontroller is used to monitor the meter current consumption, display the current consumption
on the eight-digit alphanumeric display, and communicate over USB with the PC applications on the PC host. The
discrete current amplifier and integrator are used with the internal comparator and timer to calculate the average
current consumption.
A second CP2400 is used to drive the monitor display. The monitor display is an alphanumeric display with eight
14-segment characters. The monitor display is normally used to display average current consumption. Pressing
the Mode button will alternately display the elapsed time or output pulse frequency.
Three pin headers are provided for different power options. The Wireless M-Bus demo board may be powered from
a USB, a wall adapter, or a 3.6 V long-life Lithium battery. The meter section can be powered from the battery while
the monitor section is powered from USB or wall power.
Rev. 0.1
3