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 data byte to be written in the destination register. Each

transmitted byte is acknowledged by the STWLC68 through an ACK pulse (Figure 10)

Writing to multiple registers (page write)

The STWLC68 supports writing to multiple registers with auto-incremental addressing. When data is written into

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

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

Reading from a single register

Reading from a single register begins with a START condition followed by 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. As shown in

Figure 12, an ACK pulse is generated by the STWLC68 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.

STWLC68

I2C interface

DS13131 - Rev 3

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