FAN54014 datasheet(31/37 Pages) FAIRCHILD

Part #	FAN54014

Description	USB-Compliant Single-Cell Li-Ion Switching Charger with USB-OTG Boost Regulator

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

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FAN5401X Family • Rev. 1.0.2

31

Read and Write Transactions

The figures below outline the sequences for data read and

write. Bus control is signified by the shading of the packet,

defined as

Master Drives Bus

and

Slave Drives Bus

.

All

addresses

and

data

are

MSB

first.

Table 21. Bit Definitions for Figure 49, Figure 50

Symbol

Definition

S

START, see Figure 46.

A

ACK. The slave drives SDA to 0 to acknowledge

the preceding packet.

A

NACK. The slave sends a 1 to NACK the

preceding packet.

R

Repeated START, see Figure 48

P

STOP, see Figure 47

S

Slave Address

A

Reg Addr

A

P

0

7 bits

8 bits

Data

000

Figure 49. Write Transaction

S

Slave Address

A

Reg Addr

A

0

7 bits

8 bits

R

Slave Address

7 bits

1

A

Data

A

8 bits

00

0

1

P

Figure 50. Read Transaction

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