USB2534 datasheet(33/52 Pages) MICROCHIP

33 / 52 page

USB 2.0 Hi-Speed 4-Port Hub Controller

Datasheet

 2014 Microchip Technology Inc.

DS00001713A-page 33

In this operation, following the 7-bit slave address, the 8-bit register address is written indicating the

start address for the subsequent sequential read operation. In the read sequence, every data access

is a data read from a data register where the register address increments after each access. The write

sequence can end with optional Stop (P). If so, the read sequence must begin with a Start (S).

Otherwise, the read sequence must start with a Repeated Start (Sr).

Figure 7.2 shows the format of the read operation. Where color is visible in the figure, blue and gold

indicate signaling from the I2C master, and gray indicates signaling from the slave.

7.1.2

Pull-Up Resistors for I2C

The circuit board designer is required to place external pull-up resistors (10 k

Ω recommended) on the

SDA & SCL signals (per SMBus 1.0 Specification) to Vcc in order to assure proper operation.

7.2

SMBus Slave Interface

The USB2534 includes an integrated SMBus slave interface, which can be used to access internal

device run time registers or program the internal OTP memory. SMBus detection is accomplished by

detection of pull-up resistors (10 K

Ω recommended) on both the SMBDATA and SMBCLK signals. To

disable the SMBus, a pull-down resistor of 10 K

Ω must be applied to SMBDATA. The SMBus interface

can be used to configure the device as detailed in Section 6.1, "Configuration Method Selection," on

page 27.

Note: All device configuration must be performed via the Pro-Touch Programming Tool. For additional

information on the Pro-Touch programming tool, contact your local Microchip sales

representative.

Figure 7.2 I2C Sequential Access Read Format

7-Bit Slave Address

n n n n n n n n

ACK

for xxxxxxxx

n n n n n n n n

ACK

for xxxxxxxx + 1

...

n n n n n n n n

NACK

If previous write setting up

Stop (P), otherwise it will be

Repeated Start (Sr)

for xxxxxxxx + y

7-Bit Slave Address

xxxxxxxx

Address

(bits 7-0)

Optional. If present, Next

access must have Start(S),

otherwise Repeat Start (Sr)

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