Copyright

©2010, KT Micro, Inc.

4

KT0806L

4 I2C Compatible 2-Wire Serial Interface

4.1 General Descriptions

The serial interface consists of a serial controller and registers. An internal address decoder transfers the

content of the data into appropriate registers. Please note that the I2C address is 0x 0110110 the same as

in KT0806. Neither software nor hardware change is needed if KT0806L is used to replace KT0806.

Both the write and read operations are supported according to the following protocol:

Write Operations:

BYTE WRITE:

The write operation is accomplished via a 3-byte sequence:

Serial address with write command

Register address

Register data

A write operation requires an 8-bit register address following the device address word and acknowledgment.

Upon receipt of this address, the KT0806L will again respond with a “0” and then clock in the 8-bit register

data. Following receipt of the 8-bit register data, the KT0806L will output a “0” and the addressing device,

such as a microcontroller, must terminate the write sequence with a stop condition (see Figure 3).

Read Operations:

RANDOM READ:

The read operation is accomplished via a 4-byte sequence:

Serial address with write command

Register address

Serial address with read command

Register data

Once the device address and register address are clocked in and acknowledged by the KT0806L, the

microcontroller must generate another start condition. The microcontroller now initiates a current address

read by sending a device address with the read/write select bit high. The KT0806L acknowledges the

device address and serially clocks out the register data. The microcontroller does not respond with a “0” but

does generate a following stop condition (see Figure 3).

RANDOM REGISTER WRITE PROCEDURE

S 0 1 1 0 1 1 0 W A

A

A P

7 bit address

register address

data

Acknowledge

Acknowledge

STOP condition

START condition

WRITE command

Acknowledge

RANDOM REGISTER READ PROCEDURE

S 0 1 1 0 1 1 0 W A

A S 0111110 R A

A P

7 bit address

register address

7 bit address

data

Acknowledge

Acknowledge

Acknowledge

START condition

WRITE command

READ condition

NO Acknowledge

STOP condition

Figure 3: Serial Interface Protocol