Ercogener GenLoc 354e, User Manual, Page: 29 / 69

EG_GenLoc354e_1040Q_UG_002_UK Page 29 / 69
Descriptions and non-contractual illustrations in this document are given as an indication only.
ERCOGENER reserves the right to make any modifications.
Dct_427_02
3.5 One Wire Bus
3.5.1 One Wire Bus
By default, the One Wire Bus is managed by the processor and only manages « serial number » readers in
read-only mode 64 bits.
Table 13: One Wire Bus description
Signal
14-pin connector
Pins N°
I/O Kind of I/O Description
Bus One Wire
GND 1 I/O
Analog One Wire Bus
8
Corresponds to wires
White/green
for One Wire Bus
Black for GND
see ANNEX 2 - 14-pins Micro-FIT cable (Inputs/Outputs)
Table 14 : One Wire Bus – Electrical characteristics
Characteristics Symbols Conditions Min. Typ. Max. Unit
Input Voltage – Low V
IL
-0.3 0.8 V
DC
Input Voltage – High V
IH
2 3.5 V
DC
Hysteresis Voltage V
Hys
0.4 0.7 V
DC
Input Leakage Current I
LEAK
-4 38 µA
DC
Input capacitance C
IN
14 pF
Output Low-level Voltage V
OL
0.4 V
DC
Output High-level Voltage V
OH
2.8 V
DC
Output Current I
o
±16 mA
DC
Figure 8 : Internal electrical scheme of the One Wire bus
Assembly working with identification keys DS1990 iButton® from the manufacturer MAXIM.
The integrator has the responsibility to protect the input from electrical perturbations and to
respect the functioning parameters values.