Cypress Semiconductor CY8C24894 Uživatelský manuál stáhnout pdf (Strana 28)

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

Hardware

4.2.2 USB Mini B Connector

USB Mini B connector communicates between the PC and the bridge. It is used to power up the

bridge and supply a voltage range of 3.3 V or 5 V to the demo board. These plugs are always

oriented downstream towards the USB device. It has SN65220, a single transient voltage

suppressor, to provide electrical noise transient protection to the USB port.

Figure 4-5. USB Mini Port Schematic

4.2.3 ISSP Programming Header

The in-system serial programming header is used to:

■ Burn the hex code onto the chip

■ Connect the MiniProg to program the chip

The ISSP connector consists of the following:

Table 4-1. ISSP Header Connection Details

Pin No Connection Description

1 +V Device To supply voltage to the bridge

2 GND Ground pin of the bridge

3 INT Interrupt pin

4 SCL Serial clock line

5 SDA Serial data line

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 63 64

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Cypress Semiconductor CY8C24894 Uživatelský manuál Strana 28