HPS-100 Datasheet, PDF (8/24 Pages) ams AG – Automotive Hydrogen Sensor

Figure 8:
Byte 0 Bit Order
Byte 0, H₂ Concentration
HPS-100− 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 0.5.
x = Concentration in % Hydrogen
(EQ1) Byte Value = (x % H₂)* 200/ (100 % H₂)
(EQ2) x % = Byte Value *(100% H₂)/200
Figure 9:
Byte 1 Status Bit Assignment
Range: 0 - 200 (Hexadecimal 0 - C7)
No Value: 255 (Hexadecimal FF)
Values: 0 - 100% H₂
Resolution: 0.5 =(100 % H₂) / 200
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
6
Byte 1 Error 5 Error 4
5
Error 3
4
Error 2
LSB
3
2
1
0
EMC_Corr
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
No Value: 1
Bit 1+2: The error category
Value: 0 - 3
Page 8
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ams Datasheet
[v1-00] 2015-Apr-06