Arexx BS-1200 Dokumentacja Pobierz pdf (Strona 9)

AREXX Engineering & JM3 Engineering

Version: 1.05 Nov. 9

, 2014 page: 9

3.2. HTU21D

Read Commands

Hex Code

Comment

Trigger Temperature Measurement

0xE3

Hold master

Trigger Humidity Measurement

0xE5

Hold master

Trigger Temperature Measurement

0xF3

No Hold master

Trigger Humidity Measurement

0xF5

No Hold master

Write user register

0xE6

Read user register

0xE7

Soft Reset

0xFE

User Register

Bit

# Bits

default

Measurement Resolution

Bit 7 Bit 0 RH Temp

0 0 12 bits 14 bits

0 1 8 bits 12 bits

1 0 10 bits 13 bits

1 1 11 bits 11 bits

7,0

‘00’

Status End of Battery

‘0’: VDD>2.25V

‘1’: VDD<2.25V

‘0’

Reserved – do not modify

3,4,5

‘0’

Enable on-chip heater

‘0’

Disable OTP reload

For more details of the chip functionality please refer to the datasheet.

4. Technical Data

VDD = 3.3 V +/- 5%

IDD ≤ 1.5 mA (peak)

≤ 0.2 µA (standby)

Temperature Range: -10 to 65 °C

Key features:

 High resolution module

- Altitude: 20cm

- Humidity: 0,04%

 Fast conversion

 Integrated digital pressure sensor (24 bit ΔΣ ADC)

 Operating range: 10 to 1200 mbar

 Excellent long term stability

 Instantaneous desaturation after long periods in saturation phase

 Factory calibrated

1 2 3 4 5 6 7 8 9 10

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