STWBC86 datasheet(13/40 Pages) STMICROELECTRONICS

13 / 40 page

Writing to a single register

Writing to a single register begins with a START condition followed by device address 0xC2 (7-bit device address

plus R/W bit cleared), two bytes of the register pointer and the data byte to be written in the destination register.

Each transmitted byte is acknowledged by the STWBC86 through an ACK pulse.

Figure 7. Writing to single register byte

Writing to multiple registers (page write)

The STWBC86 supports writing to multiple registers with auto-incremental addressing. When data is written into

a register, the register pointer is automatically incremented, therefore transferring data to a set of subsequent

registers (also know as page write) is a straightforward operation.

Figure 8. Writing multiple register bytes

Reading from a single register

Reading from a single register begins with a START condition followed by the device address byte 0xC2 (7-bit

device address plus R/W bit cleared) and two bytes of register pointer, then a re-START condition is generated

and the device address 0xC3 (7-bit device address plus R/W bit asserted) is sent, followed by data reading. ACK

pulse is generated by the STWBC86 at the end of each byte, but not for data bytes retrieved from the register. A

STOP condition is finally generated to terminate the operation.

Figure 9. Reading single register byte

STWBC86

I2C interface

DS14079 - Rev 1

page 13/40

STWBC86 Fiches technique(PDF) 13 Page - STMicroelectronics