User's Manual
Table Of Contents
- About the Modules
- What’s on the Module?
- About the Development Board
- Basic description
- Switches and buttons
- I2C and SPI header connectors
- Serial port connectors
- VGA connector / External LCD clock
- Development board SO-DIMM connector, P15
- Application-specific expansion headers - P16 and P17
- LCD application board header, P18
- USB Device application header, P32
- Digital I/O, P19
- Power over Ethernet (PoE) connectors
- Through-hole prototyping (wrap-field) area, P3 and P4
- Development board LEDs
- Current Measurement Option (CMO)
- Power jack, P12
- Test points
- Factory default interface configuration for development board
- LCD and USB Configuration
- Module Specifications
- Mechanical dimensions
- Environmental information
- Network interface
- Power requirements
- Real-time clock
- I2C signals
- USB interface
- Module reset
- Module / SO-DIMM signal characteristics
- Electrical characteristics
- DC electrical characteristics
- USB internal PHY DC electrical inputs and outputs
- Antenna information
- Antenna specifications - 2 dBi Dipole
- Antenna specifications - 5 dBi Dipole
- Antenna specifications - 2 dBi PCB mount
- FCC RF radiation exposure statement
- Safety statements
- Dimensions and PCB Layouts
- Certifications
ABOUT THE DEVELOPMENT BOARD
Current Measurement Option (CMO)
56 ConnectCore 9c/Wi-9C Hardware Reference, Rev. B 01/2007
3
How the CMO
works
This drawing shows how the Current Measurement Option works.
To measure the load current used on different power supplies, measure DC voltage
across the sense (CMO) resistor. The value of the resistor is 0.025
R ± 1%. Calculate
the current using this equation:
I = E/R
where
I = current in Amps
E = measured voltage in Volts
R = 0.025 Ohms
Current
measurement
option, CMO
R69
R78
Power
connector
+9VDC -
+30VDC
Current
Measurement
Option
Current
Measurement
Option
R69
0.025R
R78
0.025
R
+5VDC
+3,3VDC
+5V
power
controller
+3.3V
power
controller