EPC120 EPC [Espros Photonics corp], EPC120 Datasheet - Page 14

• Manufacturer Part Number: EPC120
• Description: Fully integrated Light-Barrier Chips with 2-Wire Bus Interface
• Manufacturer: EPC [Espros Photonics corp]

© 2011 ESPROS Photonics Corporation
Characteristics subject to change without notice
7. Parameter Setting Registers 2/18
Parameter
Name
FUSEBIT
SENSN
SENSH
SLOW
IVCOFF
SENSLC
n/a
TSET
ROM
Register No.
2
2
2
2
2
2
2
2
RAM
18
18
18
18
18
18
18
18
0
0
1
3
0
0
0
0
1
1
1
1
6
0
0
0
0
1
1
1
1
15
0
0
Bit No.
12..10
15..13
3..1
6..4
0
7
8
9
Values
Register 18 is not programmed
Register 18 is programmed
5
0
0
1
1
0
0
1
1
2
0
0
1
1
0
0
1
1
14
0
0
4
0
1
0
1
0
1
0
1
1
0
1
0
1
0
1
0
1
13
0
1
Function
This bit will automatically be set when register 18 is programmed.
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%.
Upper threshold setting of the receiver input (light reserve level). The tolerance of the
threshold is approx. ±25%.
no function, must be set to “1”
no function, must be set to “0”
must be set to “1”
no function, must be set to “0”
Settling time delay from inactive to active mode.
Values
Values
108nA
108nA
120nA
132nA
144nA
60nA
72nA
84nA
96nA
24nA
36nA
48nA
60nA
72nA
84nA
96nA
Table 5: epc120 Registers 2 and 18
Values
0
1
Default Setting
Default Setting
Default Setting
X
X
X
14
Recommended Setting
Set this value 50% above
the value set at SENSN,
i.e., if SENSN is set to
48nA, set SENSH to 72nA
Recommended Setting
Comments
If T
If T
SCAN
SCAN
>=60μs
<60μs
X
Datasheet epc12x - V2.1
www.espros.ch
epc120