epc120
Parameter
Name
Register No.
Bit No.
Function
RAM
ROM
FUSEBIT
3
19
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
n/a
3
3
19
19
8..1
no function, must be set to “0”
C2X
9
Current amplitude on the 2-wire bus
9
0
1
Values
8mA
Default Setting
Recommended Setting
X
X
16mA
CDET
3
19
11..10
Detection level for the comparator on the 2-wire bus. The level represents the optimum sig -
nal amplitude on the bus.
11
10
Values
Default Setting
Recommended
Setting
0
0
1
1
0
1
0
1
50mV
n/a
X
100mV
200mV
X
TPER
3
17
15..13
must be set to “010”
15
14
13
0
1
0
Table 6: epc120 Registers 3 and 19
All other registers are factory set and must not be used or altered.
8. Sample Parameter Setting
If we are going to use a system with a maximum cable length of 3 meters, and the maximum speed on the 2-wire bus, it is recommended to
set the registers as follows:
Bit #
ROM RAM 15
14
1
13
1
12
0
11
0
10
1
9
1
0
1
0
8
0
0
0
0
7
0
0
1
0
6
0
0
0
0
5
0
0
0
0
4
1
0
1
0
3
0
0
0
0
2
0
0
1
0
1
1
0
1
0
0
X
X
X
X
0
1
2
3
4
5
6
7
8
9
16
17
18
19
20
21
22
23
24
25
1
0
0
0
1
0
0
0
0
0
1
0
0
0
0
0
0
1
0
don't use
don't use
don't use
Address
don't use
10 26
11 27
12 28
13 29
14 30
15 31
Chip ID
Figure 13: Sample parameter setting for high speed operation
© 2011 ESPROS Photonics Corporation
Characteristics subject to change without notice
15
Datasheet epc12x - V2.1
www.espros.ch
EPC [ ESPROS PHOTONICS CORP ]
