Power Supply Outputs
The DS1103 provides three +5 V power supply output lines (VCC1 …
VCC3) internally connected to the host PC’s 5 V supply voltage.
Objective
Electrical Characteristics
Each VCC line is protected against short circuits or overload by a
multifuse on the DS1103.
Objective
If a power supply line is overloaded or short-circuited to ground, the
corresponding multifuse heats up due to the overcurrent and abruptly
raises its resistance. To reset the multifuse to its initial low resistance,
turn off the power of the expansion box for a few minutes to allow
the multifuse to cool down.
WA R NI NG
Multifuses protect against occasional faults such as
short circuits or overloads. They do not protect
against repeated or continuous fault conditions, or
conditions in which more than 13 V is present across
a tripped multifuse. The multifuses are not suitable
for failure simulation.
The total load on the connector pins providing access to
VCC (power supply) must not exceed:
n 1.5 A (max. 0.5 A on each VCC line) without using a
CP1103 or a CLP1103
n 1.5 A using a CP1103
n 0.75 A using a CLP1103
Multifuse characteristics
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Signal Connection to External Devices
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DS1103 Hardware Installation and Configuration November 2014
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