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Registers & Operation Theorem
3.5 Isolated Digital Input Circuits
The isolated digital output is an open collector transistor output. The input
can accept voltage upto 24V. The input resisters on PCI-7230/7233 and
cPCI-7230 are 1.2K
Ω
. The connection between outside signal and PCI-
7230, cPCI-7230 and PCI-7233 is shown below.
1 . 2 K O h m
I s o l a t e d I n p u t
E I C O M
1 . 2 K O h m
I s o l a t e d
I n p u t
E I C O M
Figure 3.1 Input circuits of PCI-7230, cPCI-7230 and PCI-7233
1 . 2 K O h m
D I _ n H
D I _ n L
Figure 3.2 Differential Input circuits of cPCI-7233
3.6 Isolated Digital Output Circuits
The connection of isolated digital output is shown as following diagram.
The PCI-7230 need external 10~30V DC power from the VDD pin to
provide the power source of the digital output circuit. The cPCI-7230 and
PCI-7234 is equipped with internal DC-DC converter.
On PCI-7230, an external voltage source, minimum 10V, maximum 35
VDC, is necessary to power the internal isolated circuits. It is connected
with pin-19 of CN2, When the isolated digital output goes to high, the sink
current will be from VDD.
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