Ercogener GenPro 25e, Руководство пользователя

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Descriptions and non-contractual illustrations in this document are given as an indication only.
ERCOGENER reserves the right to make any modification.
Dct_427_02
3.5.4 M ulti ONE-WIRE bus (Option S0485B)
This option Multi ONE-WIRE ( S0485B )
allows the reading of all 1-wire devices with the possibility to have
several devices on the same bus
.
Table 21 : Multi One Wire bus description
Signal
Connector 14 pins
Pins number
I/O Kind of I/O Description
Multi One-Wire
GND 2
3
I/O Logic Bus Multi ONE-WIRE
Corresponds to wires
Blue
for Bus Multi ONE-WIRE
Black for GND
see ANNEX 1 - 4-pins Micro-FIT cable (Power supply) et ANNEX - 2-
wire Micro FIT cable connector (Input/Output)
Table 22 : Multi One Wire bus -
Electrical c
haracteristics
Characteristics Symbols Conditions Min. Typ. Max. Unit
Input Voltage
– Low
V
IL
-0.3 0.9 V
DC
Input Voltage
– High
V
IH
1.9 3.3 V
DC
Input Leakage Current I
LEAK
-10 10 µA
DC
Input capacitance C
IN
10 pF
Output Low-level Voltage V
OL
@ charge 4mA 0.4 V
DC
Output High-level Voltage V
OH
@ charge 4mA 2.8 3.3 V
DC
Active Pullup On Time
4, 5
t
APUOT
2.3 2.5 2.7
μs
Pulldown Slew Rate
6
) P
DSRC
1 4.2
V/μs
Pullup Slew Rate
6
) P
USRC
0.8 4
V/μs
Power-On Reset Trip Point V
POR
2.2 V
Write-One/Read Low Time t
W1L
7.6 8 8.4
μs
Read Sample Time t
MSR
13.3 14 15
μs
1-Wire Time Slot t
SLOT
65.8 69.3 72.8
μs
Fall Time High-to-Low
6, 7
t
F1
0.54 3.0
μs
Write-Zero Low Time t
W0L
60 64 68
μs
Write-Zero Recovery Time t
REC0
5.0 5.3 5.6
μs
Reset Low Time t
RSTL
570 600 630
μs
Presence-Detect Sample Time t
MSP
66.5 70 73.5
μs
Sampling for Short and Interrupt t
SI
7.6 8 8.4
μs
Reset High Time t
RSTH
554.8 584 613.2
μs
4
Active or resistive pullup choice is configurable.
5
Except for t
F1
, all 1-Wire timing specifications and t
APUOT
are derived from the same timing circuit.
Therefore, if one of these parameters is found to be off the typical value, it is safe to assume that all these
parameters deviate from their typical value in the same direction and by the same degree
.
6
These values apply at full load, i.e., 1nF at standard speed and 0.3nF at overdrive speed. For reduced load, the
pulldown slew rate is slightly faster.
7
Fall time high-to-low (t
F1
) is derived from P
DSRC
, referenced from 2.97 V
DC
to 0.33 V
DC
.
Figure 12 :
Internal electrical scheme of the
Multi One Wire bus
The integrator has the responsibility to protect the input from electrical perturbations and to
respect the functioning parameters values
.