epc120
7. Parameter Setting Registers 2/18
Parameter
Name
Register No.
Bit No.
Function
ROM
RAM
FUSEBIT
2
18
0
This bit will automatically be set when register 18 is programmed.
0
Values
0
1
Register 18 is not programmed
Register 18 is programmed
SENSN
2
18
3..1
Lower threshold setting of the receiver input (sensitivity). A lower value increases the sens -
itivity. A too sensitive setting leads to false readings because of shot noise of the receiver
photo diode and the internal amplifier (typ. input noise level is 7nA RMS without photo di -
ode). Also induced EMI can lead to false readings if the sensitivity is set too low. The EMI
sensitivity is heavily depending on the system architecture and the electromechanical
design. The better the shielding of the chip and the photo diode and the better the PCB
layout, the better the EMI immunity.
The tolerance of the threshold is approx. ±25%.
3
0
0
0
0
1
1
1
1
2
0
0
1
1
0
0
1
1
1
0
1
0
1
0
1
0
1
Values
24nA
36nA
48nA
60nA
72nA
84nA
96nA
108nA
Default Setting
Recommended Setting
X
X
SENSH
2
18
6..4
Upper threshold setting of the receiver input (light reserve level). The tolerance of the
threshold is approx. ±25%.
6
0
0
0
0
1
1
1
1
5
0
0
1
1
0
0
1
1
4
0
1
0
1
0
1
0
1
Values
60nA
Default Setting
Recommended Setting
X
Set this value 50% above
the value set at SENSN,
i.e., if SENSN is set to
72nA
84nA
48nA, set SENSH to 72nA
96nA
108nA
120nA
132nA
144nA
SLOW
IVCOFF
SENSLC
n/a
2
2
2
2
2
18
18
18
18
18
7
8
no function, must be set to “1”
no function, must be set to “0”
must be set to “1”
9
12..10
15..13
no function, must be set to “0”
Settling time delay from inactive to active mode.
TSET
15
0
14
0
13
0
Values
Default Setting
Comments
0
1
X
If TSCAN >=60μs
If TSCAN <60μs
0
0
1
Table 5: epc120 Registers 2 and 18
© 2011 ESPROS Photonics Corporation
Characteristics subject to change without notice
14
Datasheet epc12x - V2.1
www.espros.ch
EPC [ ESPROS PHOTONICS CORP ]
