Linear Technology LT3669-2 Manual page 5

aDDitional information
Connectors and Jumpers
The board has the following connectors:
Table 1. Connectors and Jumpers Overview
Name Type Form
J1 Jumper Pin-2
J2 Connector M12
J3 Jumper Pin-2
J4 Header 8 × 2_2mm Eval Board DC1733
J5 Connector Pin-6
J6 Jumper Pin-4
J7 JTAG Header10 × 2
J8 Jumper Pin-3
J9 Jumper Pin-3
Jumper J1
Jumper J1 sets the Erase/PB12 pin of the microcontroller
to VDD3 (3.3V). By default the J1 header is not populated.
For details about the Erase/PB12 pin see the ATSAM31S2AA
microcontroller data sheet.
Connector J2
Connector J2 is a 5-pin M12 male connector. Plug a
standard industrial sensor cable to this connector to sup-
ply and communicate to the DC2227A using an IO-Link
master. Table 2 shows the internal pin assignments to the
LT3669-2 IO-Link PHY:
Table 2. Connector J2 Pinout
M12 Pin LT3669-2's Pin
1 L+
2 Q2
3 GND
4 CQ1
5 Not Connected
Comment
Atmel µC Flash Erase
IO-Link Signals (L+, L–, CQ1, Q2)
LT3669-2 EN/UVLO Pin
SPI Interface
Sensor Selection
JTAG Programming
VDD3 Select
Reset Select
Comment
DC2227A Input Supply (24V)
LT3669-2 Second Driver
DC2227A Ground Node
LT3669-2 Transceiver (IO-Link)
DEMO MANUAL DC2227A
Jumper J3
Jumper J3 enables/disables the on board LT3669-2 (which
also generates the internal 3.3V supply rail). Close this
jumper (default position) to use the onboard LT3669-2
as the IO-Link PHY (it will start up for L+ voltages above
14.8V). Leave this jumper open if the external DC1733A-B
board is used (via the J4 connector) as the IO-Link PHY
instead.
Connector J4
J4 is for connecting an external DC1733A-B demo circuit
bypassing the on-board LT3669-2. This connection allows
access to more signals from LT3669-2. Connect jumper
J3 from DC1733A-B pin-to-pin to jumper J4 on this board.
Table 3 identifies each pin.
Table 3. Connector J4 Pinout
Pin Function Comment
1 TXD2 DC1733A-B Driver Input (Q2)
2 TXEN2 DC1733A-B Driver Input (Q2)
3 TXD1 DC1733A-B Driver Input (CQ1)
4 TXEN1 DC1733A-B Driver Input (CQ1)
5 RXD1 DC1733A-B Receiver Output (CQ1)
6 GND DC1733A-B Ground
7 WAKEn DC1733A-B Wake-Up Output
8 GND DC1733A-B Ground
9 SC2n DC1733A-B Driver Short Circuit Output (Q2)
10 SC1n DC1733A-B Driver Short Circuit Output (CQ1)
11 GND DC1733A-B Ground
12 RST_n DC1733A-B POR Reset Output
13 V DC1733A-B LDO's Output (3.3V)
DD(EXT)
14 GND DC1733A-B Ground
15 TP33 DC1733A-B Buck Output (5V)
16 SYNC DC1733A-B Buck Oscillator Synchronization Input
dc2227af
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