STMPE16M31 datasheet(12/85 Pages) STMICROELECTRONICS

12 / 85 page

I2C interface module

STMPE16M31, STMPE24M31

12/85

Doc ID 16174 Rev 4

Acknowledge bit (ACK)

The acknowledge bit is used to indicate a successful byte transfer. The bus transmitter

releases the SDA after sending eight bits of data. During the ninth bit, the receiver pulls the

SDA low to acknowledge the receipt of the eight bits of data. The receiver may leave the

SDA in high state if it would to not acknowledge the receipt of the data.

Data input

The device samples the data input on SDA on the rising edge of the SCL. The SDA signal

must be stable during the rising edge of SCL and the SDA signal must change only when

SCL is driven low.

Memory addressing

For the bus master to communicate to the slave device, the bus master must initiate a Start

condition and be followed by the slave device address. Accompanying the slave device

address, there is a Read/W bit (R/W). The bit is set to 1 for Read and 0 for Write operation.

If a match occurs on the slave device address, the corresponding device gives an

acknowledgement on the SDA during the 9th bit time. If there is no match, it deselects itself

from the bus by not responding to the transaction. The register memory map of the device is

8-bit address width. Therefore, the maximum number of register is 256 registers of 8-bit

width.

Table 6 illustrates the device operating modes that are supported.

Table 6.

Device operation modes

Mode

Bytes

Initial sequence

Read

≥1

START, Device Address, R/W

=0, Base register Address to be read

ReSTART, Device Address, R/W

=1, Data Read, STOP

If no STOP is issued, the Data Read can be continuously

preformed. The address is automatically incremented on

subsequent data read.

Write

≥1

START, Device Address, R/W

=0, Register Address to be written, Data Write, STOP

If no STOP is issued, the Data Write can be continuously

performed. The address is automatically incremented on

subsequent write.

Obsolete

Product(s)

- Obsolete

Product(s)

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