HLS-440P Datasheet, PDF (8/23 Pages) ams AG – Automotive Hydrogen Leak Sensor

Figure 8:
Byte 0 Bit Order
Byte 0 H₂ Concentration
HLS-440P− ElectricalInterface
Bit
MSB
7
6
5
4
3
2
LSB
1
0
Byte 0
X
X
X
X
X
X
X
X
This byte shows the H₂ concentration in a resolution of 0.05.
x = Concentration in % Hydrogen
(EQ1) Byte value = (x % H₂)* 200/ (10 % H₂)
(EQ2)
x % = byte value *(10 % H₂)/200
Range: 0 - 200 (Hexadecimal 0 - C8)
No value: 255 (Hexadecimal FF)
Values: 0 - 10 % H₂
Resolution: 0.05 = (10 % H₂) / 200
Figure 9:
Byte 1 Status Bit Assignment
The No value is sent if there is no valid H₂ concentration
(accompanied by Not_ready bit in status byte (Byte 1))
Byte 1 Status
Bit
MSB
7
Byte 1 Bit 7
6
Bit 6
Neg_
drift3
5
Bit 5
Neg_
drift2
4
Bit 4
Neg_
drift1
3
Bit 3
EMC_
Corr
LSB
2
1
0
Bit 2 Err_
Category
Bit 1 Err_
Category
Not_ready
This byte shows the status of the module.
Bit 0: If the not_ready bit is set, the module is not up or not
working.
Value: 0 or 1
Bit 1 + 2: The error category
Value: 0 - 3
The figure below describes the error category definition
Page 8
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[v1-00] 2015-Apr-01