Tel:+86-755-82973805

Fax: +86-755-82973550

Email:sales@hoperf.com

http://www.hoperf.com

13

TH08 datasheet

0x40.

A6

A5

A4

A3

A2

A1

A0

R/W

1

0

0

0

0

0

0

0

command table10. Commands other than TH0se documented below are undefined and should not be sent to the

device.

Command Description

Command Code

Measure Relative Humidity, Hold Master Mode

0xE5

Measure Relative Humidity, No Hold Master Mode

0xF5

Measure Temperature, Hold Master Mode

0xE3

Measure Temperature, No Hold Master Mode

0xF3

Read Temperature Value from Previous RH Measurement

0xE0

Reset

0xFE

Write RH/T User Register 1

0xE6

Read RH/T User Register 1

0xE7

5.1. Issuing a Measurement Command

The measurement commands instruct the TH08 to perform one of two possible measurements; Relative Humidity or

Temperature. The procedure to issue any one of these commands is identical. While the measurement is in

progress, the option of either clock stretching (Hold Master Mode) or Not Acknowledging read requests (No Hold

Master Mode) is available to indicate to the master that the measurement is in progress; the chosen command

code determines which mode is used.

Optionally, a checksum byte can be returned from the slave for use in checking for transmission errors. The

checksum byte will follow the least significant measurement byte if it is acknowledged by the master. The

checksum byte is not returned if the master “not acknowledges” the least significant measurement byte. The

The checksum byte is optional after initiating an RH or temperature measurement with commands 0xE5, 0xF5,

0xE3, and 0xF3. For all other commands, the checksum byte is not supported.