Data Sheet

21
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HTE501
Switching on/off the heater:
Command CMD Hex Code
MSB LSB
Heater ON
0x30
0x6D
Heater OFF 0x66
I²C
Datenstruktur
7654321 76543210 76543210
S
W
0
A
0
A
0
A
0
P
R / W
I2C ADDRESS
CMD MSB=0x30
16 BIT COMMAND
CMD LSB=0x6?
ASTRID_I2C_Befehle_version2 - Kopie / 0x3066_0x306D 20.09.2021 \ Haider A.
Figure 23: Constant current heater commands
At any kind of reset the heater gets deactivated automatically.
The heater current value is adjustable between 5 mA and 80 mA. The default value for the heater current
after power-up is 5 mA.
Important note: The heater current must not lead to a temperature that exceeds the sensor’s max. upper
temperature limit of 135 °C.
To change the heater current, see chapter 6.13.
6.13 Change Sensor Settings (0x72A7)
This command allows to change the sensor’s settings. They stay in place until any reset. Sensor settings
can only be changed in idle mode.
Command CMD Hex Code
Change Sensor Settings 0x72A7
I²C
Datenstruktur
7654321 76543210 76543210 76543210
S
W
0
A
0
A
0
A
0
A
0
WRITE
76543210 76543210 76543210
A
0
A
0
A
0
P
READ
7654321 76543210 76543210
S
R
1
A
0
A
0
N
1
P
!!
R / W
R / W
I2C ADDRESS
CMD MSB=0x72
NEXT1
MEM ADR
DATA[0]
1
DATA[n] CRC8
16 BIT COMMAND
CMD LSB=0xA7
1
DATA[0] DATA[n]
I2C ADDRESS
Write n x data byte
Read n x data byte
ASTRID_I2C_Befehle_version2 - Kopie / 0x7154_0x72A7 20.09.2021 \ Haider A.
Figure 24: Memory access