
CY3240 USB-I2C Bridge Guide, Doc. # 001-66660 Rev.*B 31
Hardware
Figure 4-8. I2C Slave Interface Schematic
4.2.6 Demo Board
The demo board lights the two LEDs upon receiving data from the host and transfers the data,
acquired from the photo diode to the host.
The PSoC device (CY8C21123) is used to control the two LEDs based on input from the host using
the Bridge Control Panel. The PSoC device updates the I2C register with the sensor information,
which can be read by any I2C master.
Table 4-3. CY8C21123 Pin Connectivity
Pin No. Port No Description
6 P0[4] LED1
7 P0[2] LED2
1 P0[5] Photo-diode
8 P1[0] Voltage supply
3 P1[1] Ground
2 P0[3] Interrupt
5 Vcc Serial clock
4 GND Serial data
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