Linear Technology LTC2874, Демонстрационное руководство

Страница: 6 / 20

6
dc2228af
DEMO MANUAL DC2228A
operating information
TVS Protection
The C/Q and L+ pins are protected by 36V TVS diodes. Do
not connect to any voltage higher than 30V.
Thermal Protection
If the DC2228A board temperature reaches 80°C, the Con-
trol Tool software reports a “TEMP-FAULT” and disables
operation. The thermal sensor Q19 is located underneath
flyback transformer T1.
L+ Diode Isolation
If L+ isolation is desired, remove 0Ω resistors R158 to
R165 which normally shunt Schottky diodes D28 to D35.
Demonstration Board Options
The DC2228A reference design demonstrates LTC2874
operating in an 8-port IO-Link master system. Its two
LTC2874 IC’s operate under the control of the IO-Link v1.1
protocol stack coded in microcontroller firmware. Control
Tool software provides access to a limited set of LTC2874
features but is oriented toward operating IO-Link devices
that connect to the DC2228A ports.
The default internal register settings for the on-board
LTC2874 IC’s are listed in Table 6.
Another demonstration board, DC1880A , provides access
to all LTC2874 features and more direct access to its SPI
register.
Table 6. DC2228A Default Settings for LTC2874 R/W Registers
Register
Address
Register
Name
Default
Value
Register
Address
Register
Name
Default
Value
0x1 IRQMASK 0x96 0x9 MODE2 0x04
0x2 EVENT1 0x00 0xA NSF 0xFF
0x3 EVENT2 0x00 0xB ILLM 0xFF
0x4 EVENT3 0x00 0xC TMRCTRL 0xD2
0x5 EVENT4 0x00 0xD CTRL1 0x00
0x8 MODE1 0x80 0xE CTRL2 0x00
Companion IO-Link Device DC2227A
While the DC2228A and Control Tool software will operate
any IO-Link sensor, the example screen shots given in this
manual use the DC2227A IO-Link Device with Multiple
Sensors . The DC2227A is a complete IO-Link Device
incorporating the LT3669-2 along with a temperature sen-
sor, light sensor, pushbutton, and an incandescent lamp.
IO-Link Firmware
The firmware contained in the NXP microcontroller is intel-
lectual property owned by TEConcept Gmbh in Germany.
Any attempt to copy, transfer, or reverse engineer the
firmware is forbidden. The source code or an object library
for the IO-Link stack can be licensed from TEConcept.