TIACN -- TIA Control Register (address 0x10)
The parameters in the TIA control register allow the configuration of the transimpedance gain (RTIA) and the load resistance
(RLoad).
Bit
Name
Function
[7:5]
RESERVED
RESERVED
TIA feedback resistance selection
000 External resistance (default)
001 2.75kΩ
010 3.5kΩ
011 7kΩ
[4:2]
TIA_GAIN
100 14kΩ
101 35kΩ
110 120kΩ
111 350kΩ
RLoad selection
00 10Ω
[1:0]
RLOAD
01 33Ω
10 50Ω
11 100Ω (default)
REFCN -- Reference Control Register (address 0x11)
The parameters in the Reference control register allow the configuration of the Internal zero, Bias and Reference source. When
the Reference source is external, the reference is provided by a reference voltage connected to the VREF pin. In this condition the
Internal Zero and the Bias voltage are defined as a percentage of VREF voltage instead of the supply voltage.
Bit
Name
Function
Reference voltage source selection
7
REF_SOURCE
0 Internal (default)
1 external
Internal zero selection (Percentage of the source reference)
00 20%
01 50% (default)
10 67%
[6:5]
4
INT_Z
11 Internal zero circuitry bypassed (only in O2 ground referred measurement)
Selection of the Bias polarity
0 Negative (VWE – VRE)<0V (default)
1 Positive (VWE –VRE)>0V
BIAS_SIGN
BIAS selection (Percentage of the source reference)
0000 0% (default)
0001 1%
0010 2%
0011 4%
0100 6%
0101 8%
[3:0]
BIAS
0110 10%
0111 12%
1000 14%
1001 16%
1010 18%
1011 20%
1100 22%
1101 24%
15
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