USB3803 datasheet(43/99 Pages) MICROCHIP

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DS00001691B-page 43

USB3803

6.2

Interconnecting the USB3803 to an I2C Master

6.3

I2C Message Format

6.3.1

SEQUENTIAL ACCESS WRITES

The I2C interface will support sequential writing of the register address space of the USB3803. This mode is useful for

configuring contiguous blocks of registers. Please see section on SOC interface for address definitions. Figure 6-2

shows the format of the sequential write operation. Where color is visible in the figure, blue indicates signaling from the

I2C master, and gray indicates signaling from the USB3803 slave:

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

sequential write operation. Every data access after that is a data write to a data register where the register address incre-

ments after each access and ACK from the slave must occur. Sequential write access is terminated by a Stop condition.

FIGURE 6-1:

I2C CONNECTIONS

Note:

The largest pullup values which meet the customer application should be selected in order to minimize

power consumption. Pullup values must also have low enough resistance to support the desired i2C oper-

ating speed with the expected total capacitance in the application. Typical applications are expected to use

pullup values between 220Ω and 2.7kΩ for operation at 1MHz on SCL and SDA. Larger pullup resistors

may be acceptable for operation at 400KHz or 100KHz.

FIGURE 6-2:

I2C SEQUENTIAL ACCESS WRITE FORMAT

I2C

MASTER

CONTROLLER

USB3803

SCL

SDA

SOC

SCL

SDA

VDD

INT

7-Bit Slave Address

nnnnnnnn

Data value for

XXXXXX

...

nnnnnnnn

Data value for

XXXXXX + y

xxxxxxxx

Address

(bits 7-0)

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