TH02

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powered down when the master controller is communicating with the other slave devices.

The format of the address byte is shown in Table 16.

A6

A5

A4

A3

A2

A1

A0

R/W

1

0

0

0

0

0

0

1/0

To write to a register on the TH02, the master should issue a start command (S) followed by the slave address,

0x40. The slave address is followed by a 0 to indicate that the operation is a write. Upon recognizing its slave

address, the TH02 issues an acknowledge (A) by pulling the SDA line low for the high duration of the ninth SCL

cycle. The next byte the master places on the bus is the register address pointer, selecting the register on the

TH02 to which the data should be transferred. After the TH02 acknowledges this byte, the master places a data

byte on the bus. This byte will be written to the register selected by the address pointer. The TH02 will

acknowledge the data byte, after which the master issues a Stop command (P). See Table 17.

Master  Slave 

 

 

Sequence to Write to a Register

S

Slave Address

W

A

Address Pointer

A

Register Data

A

P

Sequence to Start a Relative Humidity Conversion

S

0x40

0

A

0x03

A

0x01

A

P

Sequence to Start a Temperature Conversion

S

0x40

0

A

0x03

A

0x11

A

P