Rabbit BL4S200, Руководство по эксплуатации продукта

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BL4S200 User’s Manual 28
Table 3 lists the banks of configurable I/O and summarizes the jumper settings.
Table 3. Banks of BL4S200 Digital Inputs
Digital Inputs
Configuration
Header
Pins Jumpered Pulled Up/Pulled Down
DIO0–DIO7 JP9 1–2 Inputs pulled up to +K x
DIO8–DIO15 JP8 3–4 Inputs pulled up to +5 V
DIO16–DIO23 JP1 5–6 Inputs pulled down to GND
DIO24–DIO31 JP2 7–8 Inputs pulled up to + 3.3 V
The actual switching threshold is approximately
1.40 V. Anything below this value is a logic 0,
and anything above 1.90 V is a logic 1. The con-
figurable I/O are each fully protected over a
range of 0 V to +36 V, and can handle short
spikes from -5 V to +40 V.
NOTE: If the inputs are pulled up to +K x , the
voltage range over which the digital inputs
are protected changes to 5 V - K
x to +36 V.
Figure 8. BL4S200 Digital Input
Protected Range
CAUTION: Do not allow the voltage on a configurable I/O pin to K x to
avoid damaging the input.
+40 V
+36 V
+3.3 V
–5 V
Normal Switching
Levels
Spikes
Digital Input V
oltage
Spikes
Spikes
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