6

dc2227af

DEMO MANUAL DC2227A

Connector J5

J5iscurrentlyunusedandmaybehelpfulforthecustomer’s

own applications that make use of the SPI interface of the

Atmel microcontroller.

Table 4. Connector J5 SPI Pinout

Pin

Function

Comment

1

MISO

Master In Slave Out

2

MOSI

Master Out Slave In

3

SPCK

SPI Clock

4

RESETn

Reset

5

VDD3

Power

6

GND

Ground

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

Comment

1

Close 1-2 to Use the LTC2997’s Int. NPN

2

LTC2997’s D+

To Base/Collector of Remote NPN

3

Q1’s Base/Collector

Close 2-3 to Use the On-board NPN Q1

4

LTC2997’s D–

To Emitter of Remote NPN

Connector J7

Standard20-pinJTAGprogramming/debugginginterface.

This interface fits many JTAG/ICE connectors.

Table 6. JTAG Connector Pinout

Pin

Function

Comment

1, 2

VDD3

3

VDD3

Via 100k

5

TDI

7

TMS

9, 11

TCK

13

TDO

15

RESETn

17, 19

N.C.

6, 8, 10, 12, 14, 16, 18, 20

GND

aDDitional information

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.