M-BUS-EK Datasheet, PDF (6/20 Pages) Silicon Laboratories – AC to DC power adapter

Wireless M-Bus-EK
7. Hardware Setup
Please install the USBXpress drivers before connecting the Wireless M-Bus demo board to the PC (see “6. Install
USBXpress Driver”).
The Wireless M-Bus Demo Board has three headers on the left side of the board to configure the C8051F342 and
C8051F930 power sources.
To configure both MCUs to operate from USB power, configure the headers as shown in Figure 5.
 Configure shorting blocks to short pins 2 and 3 on J10.
 Remove shorting block on J11.
 Configure shorting blocks to short pins 1 and 2 of J12.
J1
J10
SW3
J11
J12
J2
U4
F342
J4
J6
J5
SW2
Monitor Meter
SW1
J3
Wireless M-Bus Demo Board
U2
J8
J13
J7
F930
J9
U1
ANT1
U5
CP2400
U3
CP2400
SILICON LABS
www.silabs.com
DIS2
DIS1
Figure 5. USB Power Configuration
The headers in the middle of the board provide options for measuring the current of the C8051F930 MCU, Si4431
EZRadioPRO, and CP2400 LCD Controller.
To configure the Monitor circuit to include the MCU and radio current, install the headers as shown inFigure 5.
 Short pins 1 and 2 on J5 with a shorting block.
 Remove shorting block on J6 to enable 1  resistor.
 Short pins 2 and 3 on J7 to enable MCU current measurement.
 Short pins 2 and 3 on J8 to enable radio current measurement.
 Short pins 1 and 2 on J9 to disable LCD current measurement.
 Short pins 2 and 3 on J13 to power the CP2400 from the meter supply.
After configuring the headers, connect one end of the USB cable to the Wireless M-Bus demo Board and the other
end to the PC. The first time the Wireless M-Bus demo board is connected to the computer, the Found New
Hardware wizard will indicate “Found New Hardware - USBXpress Device”. If the Found New Hardware wizard
fails to correctly identify the USBXpress device, ensure that the USBXpress drivers are installed correctly as
explained in “6. Install USBXpress Driver”.
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Rev. 0.1