1
dc2227af
DEMO MANUAL DC2227A
Description
LT3669-2
IO-Link Device with Multiple Sensors
Demonstration circuit 2227A is a complete IO-Link
®
de-
vice built using the
v1.1 physical interface (PHY). The IO-Link stack protocol
runs on an Atmel ATmega microcontroller which connects
to LT3669-2’s logic IO-signals to communicate with an
IO-Link master via the CQ1 transceiver.
An LTC2997 temperature sensor, an opto-coupler (light
barrier) and a pushbutton demonstrate IO-Link device
functionality and master-slave interoperability.
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. IO-Link is a registered trademark of PROFIBUS User Organization
(PNO). All other trademarks are the property of their respective owners.
performance summary
BoarD photo
A 28V/100mA light bulb connected to LT3669-2’s second
driver (Q2) demonstrates its high current driving capabili-
ties. All low voltage circuitry is supplied by the LT3669-2’s
integrated buck and LDO for high efficiency.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2227A
Specifications are at T
A
= 25°C, V
L
+ = 24V
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
L+
Input Supply
18
36
V
V
BUCK
LT3669-2's Buck Output Voltage
3.8
4
4.2
V
V
LDO
LT3669-2's LDO Output Voltage
3.135
3.3
3.465
V
