ISP1122D datasheet(21/48 Pages) PHILIPS

21 / 48 page

Philips Semiconductors

ISP1122

USB stand-alone hub

Product speciﬁcation

Rev. 03 — 29 March 2000

21 of 48

9397 750 07002

10.2 Hardware connections

Via the I2C-bus interface the ISP1122 can be connected to an external EEPROM

(PCF8582 or equivalent). The hardware connections are shown in Figure 5.

The SCL and SDA pins are multiplexed with pins OPTION and INDV respectively.

The slave address which ISP1122 uses to access the EEPROM is 1010000B. Page

mode addressing is not supported, so pins A0, A1 and A2 of the EEPROM must be

connected to GND (logic 0).

10.3 Data transfer

When the ISP1122 is reset, the I2C-bus interface tries to read 6 bytes of conﬁguration

data from an external EEPROM. If no response is detected, the levels on inputs SDA

and SCL are interpreted as INDV and OPTION to select the operating mode (see

Table 4).

The data in the EEPROM memory are organized as shown in Table 22.

[1]

Vendor ID code in the Device descriptor, see Table 10.

[2]

Product ID code in the Device descriptor, see Table 10.

Fig 5.

EEPROM connection diagram.

idth

MGR780

INDV/SDA

OPTION/SCL

SDA

SCL

VDD

ISP1122

USB HUB

PCF8582

EEPROM

equivalent

I2C-bus

Table 22: EEPROM organization

Address

(Hex)

Default value

(Hex)

Contents

idVendor [1] (lower byte)

idVendor [1] (upper byte)

idProduct [2] (lower byte)

idProduct [2] (upper byte)

conﬁguration bits C7 to C0; see Table 23

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