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Communication Interface

I²C Communication

Application Note

• PUBLIC

AN000710

• v1-00 • 2020-Jul-21

12

│ 8

2.3.3

Write

Figure 7 :

Write Data

In case of a write action (RW bit is 0) the master sends data packages (new content of sensor

registers). The slave sends an Acknowledge after each data package. The communication ends when

the master set the Stop Condition.

2.3.4

Read

Figure 8 :

Read Data

In case of a read action (RW bit is 1) the master receive data packages (actual content of sensor

registers). The master sends an Acknowledge after each data package. The communication ends

when the master sends an inverted acknowledge and set the Stop Condition.

Adress-bit

Master->Slave

Master<-Slave

RW

1 0 0 0 0 0 0

0

0 0 0 1 1 1 0 1

0

0

0

A

X X X X X X X X

0

Description

0

slave address

S

A

word address (n)

A

Data(n)

P

Data Write

New content for

register 0x1D

Set pointer on

register 0x1D

Slave adress of sensor

(default = 0x40)

6 5 4 3 2 1 0

7 6 5 4 3 2 1 0

7 6 5 4 3 2 1 0

S

A

RW

P

Start Condition

Read or Write bit

Acknowledge

Stop Condition

Adress-bit

Master->Slave

Master<-Slave

RW

1 0 0 0 0 0 0

0

0 0 0 1 1 1 0 1

1

0

0 X X X X X X X X

1

Description

0

slave address

S

A

word address (n)

A

Data(n)

Ā P

Content of register

0x1D

Set pointer on

register 0x1D

Slave adress of

sensor [0x40]

6 5 4 3 2 1 0

7 6 5 4 3 2 1 0

7 6 5 4 3 2 1 0

Data Read

S

A

RW

P

Start Condition

Read or Write bit

Acknowledge

Stop Condition