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VT1536A Isolated Digital Input/Output SCP 7
Input and Output Characteristics
This section describes the electrical characteristics of the SCP's input and
output sections, as well as the operation of the input debounce timers.
Figure
4 shows a simplified schematic of one VT1536A channel.
Input Characteristics The input section drives an opto-isolator through a resistor threshold setting
network. Your system must provide at least 1 mA of current to drive the
opto-isolator. The threshold setting network controls this drive current for
various input voltages ranging from 5 to 48 Volts (see
Table 1 on page 5).
Your input voltage must be polarized positive to the Hnn terminal, and
negative to the Lnn terminal.
Output Characteristics The opto-isolated output provides a Solid-State relay and relay protection
voltage clamping diode. The solid state relay is non-polarized. The voltage
clamping diode limits voltage at the relay output to 80 V
PEAK
(begins to
conduct at about 60 V
PEAK
). The SS relay's on-resistance is 10 Ω,
off-resistance is at least 10
10
Ω. The relay's turn-on time is 3 milliseconds.
Figure 3 Recommended Connections and Voltage Limits