Linear Technology LT3669-2 Manual page 6

DEMO MANUAL DC2227A
aDDitional information
Connector J5
J5 is currently unused and may be helpful for the customer's
own applications that make use of the SPI interface of the
Atmel microcontroller.
Table 4. Connector J5 SPI Pinout
Pin Function
1 MISO
2 MOSI
3 SPCK
4 RESETn
5 VDD3
6 GND
Jumper J6
J6 configures the sense device used by the LTC2997 to
measure temperature. It could be either the LTC2997's
internal diode, the on-board diode-connected NPN Q1 or
a remote NPN (connected as a diode) using a twisted pair:
Table 5. Jumper J6 Pinout (Temperature Sense Device)
Pin Description
1 LTC2997's V
CC
2 LTC2997's D+
3 Q1's Base/Collector
4 LTC2997's D–
Connector J7
Standard 20-pin JTAG programming/debugging interface.
This interface fits many JTAG/ICE connectors.
Table 6. JTAG Connector Pinout
Pin Function
1, 2 VDD3
3 VDD3
5 TDI
7 TMS
9, 11 TCK
13 TDO
15 RESETn
17, 19 N.C.
6, 8, 10, 12, 14, 16, 18, 20 GND
6
Comment
Master In Slave Out
Master Out Slave In
SPI Clock
Reset
Power
Ground
Comment
Close 1-2 to Use the LTC2997's Int. NPN
To Base/Collector of Remote NPN
Close 2-3 to Use the On-board NPN Q1
To Emitter of Remote NPN
Comment
Via 100k
Jumper J8
J8 selects the source for the VDD3 power.
Table 7. VDD3 Source Select Pinout
Pin Description Comment
1 DC1733A-B's LDO Close 1-2 to Use DC1733A-B as PHY
2 Local VDD3 rail Default: Connected to Pin 3
3 Local LT3669-2's LDO Close 2-3 to Use Local LT3669-2 as PHY
Jumper J9
J9 selects the source for the microcontroller's reset pin.
Table 8. Reset Source Select Pinout
Pin Description Comment
1 DC1733A-B RSTn Close 1-2 to use DC1733A-B as PHY
2 Local RESETn Default: Connected to Pin 3
3 Local LT3669-2 RSTn Close 2-3 to Use Local LT3669-2 as PHY
Indicators
The following indicators are available:
Table 9. Indicators
Name Comment
LED1 ON (Green) if Device Is Powered up
LED2 ON (Red) if µC Started Successfully
LED3 ON (Red) if Device Is in IO-Link Mode
LP1 28V/100mA Light Bulb Between Q2 and GND
TVS Protection
The CQ1, Q2 and L+ pins are protected by 39V TVS diodes.
Do not connect to any voltage higher than 36V.
Data Storage
Data Storage is not currently supported by DC2227A. Do
not use pushbutton "DS upload" in Control Tool Software.
IO-Link Firmware
The firmware contained in the Atmel microcontroller
is intellectual property owned by TEConcept GmbH in
Germany. Any attempt to copy, transfer, or reverse en-
gineer the firmware is forbidden. The source code or an
object library for the IO-Link stack can be licensed from
TEConcept.
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