6. SPECIFICATION OF INPUTS AND OUTPUTS
Be sure to use an appropriate cable for the USB connection. For the USB data lines, a twisted pair connec-
tion must be used. In a noisy environment the data line pair should be shielded separately. In this case,
connect the cable shielding to USB shield.
If the USB interface is used to connect a removable device, provide a connector compliant with the USB
standard. This ensures that the pins of the USB interface are connected in the correct order (first shield,
then ground (GND), then V
bus
, then the data lines), thus preventing the interface from getting damaged.
For power supply below 7.5 V, see section 6.1.2.1.
For further information, see [
5, 6].
6.7.3 Maximum ratings
Symbol Parameter Note Min Max Unit
L
max
Maximum cable length 1, 2 5 m
V
usb
Maximum voltage on V
bus
, D+ and D- -0.5 5.5 V
I
max
Maximum current on V
bus
1000 mA
I
off
Overcurrent protection on V
bus
1600 1800 mA
V
in-CMM
Input common mode range DC or AC-peak with line fre-
quency (max 60Hz)
3 -0.05 0.5 V
V
in-CMM
Input common mode range DC or AC-peak with line fre-
quency (max 60Hz)
4 0.8 2.5 V
Note 1 The maximum cable length depends on the type of cable used, the number of con-
nectors between the devices, the environment where the cable is installed, as well as
the used USB transmission speed mode. As a rule of thumb, each connector pair de-
creases the maximum cable length by 0.5 meters if a USB conform connector is used.
If an arbitrary connector is used, the length penalty will be higher.
Note 2 A USB high speed (HS) connection is more sensitive than an USB full speed (FS) or
low speed (LS) connection. Hence, the maximum possible cable length also depends
on the kind of peripheral connected to the USB interface.
Note 3 For High Speed USB.
Note 4 For Low Speed USB and Full Speed USB.
© TTControl GmbH 2024. All rights reserved.
Proprietary Information
22
Document Number:
D-156-G-02-003
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