NCP4206 datasheet(17/32 Pages) ONSEMI

Part #	NCP4206

Description	Digital Programmable Multi-Phase Synchronous Buck Converter

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NCP4206

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17

R/W

1

SCL

SDA

1

0

A1

A0

D7

D6

D5

D4

D3

D2

D1

D0

NO ACK. BY

MASTER

REPEATED START

BY MASTER

FRAME 1

SERIAL BUS ADDRESS

BYTE

FRAME 2

1

ACK. BY

NCP4206

9

0

9

DATA BYTE

FROM NCP4206

R/W

1

SCL

SDA

10

0

A1

A0

D7

D6

D5

D4

D3

D2

D1

D0

ACK. BY

NCP4206

START BY

MASTER

FRAME 1

SERIAL BUS ADDRESS

BYTE

FRAME 2

COMMANDCODE

1

ACK. BY

NCP4206

9

STOP BY

MASTER

Figure 12. Read Byte

1. It is not possible to read or write a data byte from a

data register without first writing to the address

pointer register, even if the address pointer register

is already at the correct value.

2. In addition to supporting the send byte, the

NCP4206 also supports the read byte, write byte,

read word and write word protocols. (See System

Management Bus Specifications Rev. 2.0 and the

SMBus Specification Rev 1.1 Part I and Part II for

more information.)

The SMBus specification defines several protocols for

different types of read and write operations. The ones used

in the NCP4206 are discussed in this section. The following

abbreviations are used in the diagrams:

S − START

P − STOP

R − READ

W − WRITE

A − ACKNOWLEDGE

A − NO ACKNOWLEDGE

The NCP4206 uses the following SMBus write protocols.

Send Byte

In this operation, the master device sends a single

command byte to a slave device as follows:

1. The master device asserts a start condition on

SDA.

2. The master sends the 7−bit slave address followed

by the write bit (low).

3. The addressed slave device asserts ACK on SDA.

4. The master sends a command code.

5. The slave asserts ACK on SDA.

6. The master asserts a stop condition on SDA and

the transaction ends.

For the NCP4206, the send byte protocol is used to clear

Faults. This operation is shown in Figure 13.

Figure 13. Send Byte Command

SLAVE

ADDRESS

COMMAND

CODE

A

W

SP

24

6

5

3

1

If the master is required to read data from the register

immediately after setting up the address, it can assert a repeat

start condition immediately after the final ACK and carry

out a single byte read without asserting an intermediate stop

condition.

Write Byte

In this operation, the master device sends a command byte

and one data byte to the slave device as follows: The master

device asserts a start condition on SDA.

1. The master sends the 7−bit slave address followed

by the write bit (low).

2. The addressed slave device asserts ACK on SDA.

3. The master sends a command code.

4. The slave asserts ACK on SDA.

5. The master sends a data byte.

6.

The slave asserts ACK on SDA.

7. The master asserts a stop condition on SDA and

the transaction ends.

The byte write operation is shown Figure 14.

Figure 14. Single Byte Write to a Register

SLAVE

ADDRESS

COMMAND

CODE

DATA

A

W

SA

24

6

5

3

17

P

8

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