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CY3240-I2USB I2C-USB Bridge Guide, Doc. # 001-66660 Rev.**
Kit Operation
3.2
Connect Bridge to Device
Figure 3-2. Bridge to Device Connection
Perform the following steps to connect the device to I2C-USB bridge, as shown in
Figure 3-2
:
1. Connect GND of the device to GND of the bridge.
2. Connect the SDA and SCL lines to the bridge.
Bridge has 2.2 k pull-up resistors connected to +5 V. The INT pin is a pull-down bidirectional pin
that can be used as an additional signal between the bridge and I
2
C slave device for functions
such as sleep mode control.
3. Power the device from the Vdd pin on the bridge, if it does not have its own power supply. Note
that the Vdd connection between the bridge and target board is required, even if the board is self-
powered. Optionally, the bridge can provide 3.3 V or 5 V, or work with an externally powered
board using 2.4 V to 5.6 V.
4. When the connection between the bridge and USB is successful, the LED (green) lights up, as
shown in
Figure 3-3
.
Figure 3-3. Connecting Bridge to USB.
5. Open the Bridge Control Panel from the PC to work with the bridge.
3.2.1
Program I2C-USB Bridge
The CY3240 I2C-USB Bridge can be programmed using a MiniProg at the programming header of
the bridge. To use MiniProg, use the ISSP Programming Header (J2) on the board as highlighted in
Figure 3-4
.
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