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1070_0_Product_Manual - October 28, 2010 8:52 AM
Functional Block Diagram
The 250 ohm resistance is internal to the PhidgetInterfaceKit 8/8/8,
and limits the current that can flow through the output. This is
intended to protect the device from being damaged if there is a short
to ground or if an LED is used. The output is intended to drive TTL or
CMOS inputs; it is not designed to provide power to an external circuit.
Ground Protection
Ground terminals on the InterfaceKit share a common ground with USB ground. Because they are not internally
isolated, these terminals will expose the USB ground potential of the PC to which they are connected. Be sure you
are completely familiar with any circuit you intend to connect to the InterfaceKit before it is connected. If a reverse
voltage or dangerously high voltage is applied to the input or output terminals, damage to the Phidget or the PC
may result.
Q1
250
+5V
Detail of Digital Output
TRUE
FALSE
+5V
OUTPUT
GROUND
Isolating a Digital Output w
ith a Optocoupler
Driving LED causes output transistor to sink current
Maximum current through transistor will depend in part on the transf
er characteristics of the optocoupler
Be conservative, and refer to the datasheet of the optocoupler
K 1
D1
Controlling a relay with a NPN Transistor.
K 1
OUTPUT
GROUND
Phidget
Digital
Output
D1
Controlling a relay with a N-Channel MOSFET
Be sure to use a Logic-Level Mosfet - so the +5V
Digital Output is able to turn it on.
Isolating a the Digital Output w
ith a MOSFET-Based SSR
Driving LED causes output transistors to turn on
Can often be used to control AC or DC
Driving an LED with the Digital Output
USER
APPLICATION
USER
APPLICATION
USER
APPLICATION
USER
APPLICATION
USER
APPLICATION
Phidget Digital
Output x1
VS1
VS1
VS3
Q1
VS1
Load
U1
OptoCoupler
Load
D1
The Load can also be switched with the SSR on the high side.
Using a 3052 SSR Board with a Digital Output
Driving Output causes output of 3052 to Turn on
Can be used to control AC or DC
USER
APPLICATION
VS1
Load
The Load can also be switched with the 3052 on the high side.
3052
RED
BLACK
Using a 3051 Dual Relay Board with one or tw
o Digital Outputs
Driving Outputs causes 3051 Relay s to Turn on
Can be used to control AC or DC
USER
APPLICATION
Analog Input is for powering Relay s Only
0C
0NO
0NC
1C
1NO
1NC
CTL 0
CTL 1
ANL GI N
3051
OUTPUT
GROUND
Phidget
Digital
Output
OUTPUT
GROUND
Phidget
Digital
Output
OUTPUT
GROUND
Phidget
Digital
Output
OUTPUT
GROUND
Phidget
Digital
Output
OUTPUT
GROUND
Phidget
Digital
Output
OUTPUT
Phidget
Digital
Output
OUTPUT
ANALOG
INPUT
Using the 4-Port USB Hub
Powering the PhidgetSBC
An external 6 - 15V supply must used to power the PhidgetSBC and any attached USB devices.
Connecting additional USB devices to the PhidgetSBC is as easy as plugging them into the on-board 4-port hub.
Each USB port on the hub has a maximum current supply of 500mA. Ensure the power supply selected has a high
enough current output to supply the required current to all external USB devices as well as the PhidgetSBC and any
sensors or devices connected to it. The worst case requirement is 3 Watts input power per USB device. A 24 Watt
12VDC / 2 Amp power supply is provided with the 1070 - more than sufficient.
The USB Hub is a full-speed hub with a transfer rate of 12Mbits/second. We chose to go with a full speed
implementation since it is fast enough to handle traffic from Phidgets; an added benefit is lower power consumption.
Chaining the USB Hubs
The 1070 follows USB specifications and can be daisy chained to the maximum hub depth of 4.
