Cypress Semiconductor CY8C24894 Manuale Utente Scaricare il pdf (Pagina 30)

30 CY3240 USB-I2C Bridge Guide, Doc. # 001-66660 Rev.*B

Hardware

Figure 4-7. GPIO Pin Schematic

4.2.5 I2C Slave Interface Connector

The I2C slave interface connector is used to communicate data between the target device and the

bridge board. It consists of two devices, MAX3378 and SN721.

MAX3378

■ Is used to convert voltage level between the target device (Vcc) and the host level voltage (V

)

■ Has bidirectional level translation, accepts V

+1.2 V (Min) to +5.5 V (Max); V

out

(High) is 0.6

times V

(if source current is 0.02 mA) and V

out

(Low) is 0.4 V

SN721

■ An array of SCR/diode bipolar structure for ESD and over-voltage protection

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Cypress Semiconductor CY8C24894 Manuale Utente Pagina 30