Linear Technology DC1880A Guida rapida alla configurazione

dc1880af

DEMO MANUAL DC1880A

Description

LTC2874

Quad IO-Link Master

Hot Swap Controller and PHY

Demonstration circuit 1880A showcases the LTC

2874, a

quad Hot Swap™ controller and PHY suitable for IO-Link

master and other applications. DC1880A operates from

an external supply VDD and utilizes the DC590 USB serial

controller board to communicate with the LTC2874 using

SPI protocol.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot

Swap, QuikEval and Linduino are 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

Design files for this circuit board are available at

http://www.linear.com/demo/DC1880A

Specifications are at TA= 25°C, VDD = 24V, and VL= 3.3V.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VDD Input Supply Range 24VMODE = 0

24VMODE = 1 8

20 30

30 V

ΔVACL L+ Analog Current Limit Voltage ΔVACL = VSENSE+– VSENSE–

VL+ = 0V, FLDBK_MODE = 1

VL+ = VDD – 1V

Start-Up, 2XPTC Enabled, VL+ > 18V

9.2

16.7

100

24.2

ΔVGATE External N-Channel Gate Drive

(VGATE – VL+)IGATE = –1µA

VDD = 17V to 30V

VDD = 8V

4.5

VRQH,

VRQL

CQ Residual Voltage Output High, ICQ = –100mA

Output Low, ICQ = 100mA 1.2

1.1 1.6

1.5 V

IQPKH,

IQPKL

Wake-Up Request (WURQ) Current ±500 ±700 mA

IQH, IQL CQ Current Limit ±110 ±160 ±230 mA

fDTR Maximum Data Transfer Rate fDTR = 4nF

SLEW = 0

SLEW = 1

38.4

230.4

kb/s

tWU WURQ Pulse Duration 75 80 85 µs

SCK Frequency 50% Duty Cycle 20 MHz

dc1880af

DEMO MANUAL DC1880A

Quick start proceDure

Figure 1. Proper Setup

dc1880af

DEMO MANUAL DC1880A

Quick start proceDure

DC1880A is a 6-layer demonstration board. An LDO is

included to optionally derive the VLlogic supply from

the VDD input supply. An LED lights up when the IRQ pin

signals interrupt requests.

1. Install, or update as needed, Linear Technology's

QuikEval™ evaluation software on the PC. See Using

the LTC2874 Software section for more information.

2. Connect the DC590 board to the PC with a standard

USB A/B cable.

3. Connect the DC1880A board to the DC590 board using

the14-conductorribboncablesuppliedwiththeDC590

board.

4. ChoosethesourcefortheVLlogicsupply—theDC590,

the LDO on the DC1880A, or either if both are set to

the same voltage:

a. SettheDC1880ALDOjumpers(JP11andJP12)and

DC590 VCCIO jumper (JP6) to one of the combina-

tions listed in Table 1. Default jumper positions set

both boards to 5V.

b. When using a Linduino™ One instead of a DC590

board, set the DC1880A LDO to 5V(JP11 = 5.0V)

or disable it (JP12 = OPEN).

5. Before connecting the input power supply to the

DC1880A board, verify the voltage is below 40V

(normally between 8V and 30V) and that the supply

is turned off.

6. Connect the power supply between VDD and GND on

the DC1880A board as shown in Figure 1.

7. Connect line interface cables (up to 20m long) to either

the screw-terminal blocks (J1-J4) or the IO-Link con-

nectors (J5-J8).

8. Turn on the 24V power supply and verify that the IRQ

LED on the DC1880A board is lit. (The LTC2874 is

signalling that one or more of its supplies had been

low.)

9. Launch the GUI software. Refer to the Using the

LTC2874 Software section for more information on

how to control the LTC2874 using the GUI.

10.Clear the IRQ condition by clearing any Supply Event

bits that are set. On the Events tab, simply click on any

lamps that are lit.

11.Refer to the Additional Information section and the

data sheet for operating details.

dc1880af

DEMO MANUAL DC1880A

aDDitional information

VL Logic Supply

Table 1 lists several ways to supply power to the VL pin.

Methods 1a/b/c are recommended for most purposes.

Table 1. Recommended Options for Powering the VL Supply

METHOD

DC590

JP6

DC1880A

JP12

DC1880A

JP11

SOURCE FOR

VL POWER

5V*

3.3V

OPEN (2.7V)

ON*

5V*

3.3V

OPEN (2.9V)

LDO or DC590

2 EXT ON* X** LDO

3 EXT OPEN X** DC1880A VL TURRET

4 5V* or 3.3V OPEN X** DC590

* (Default)

** Including OPEN (2.9V)

L+ Power Supply Outputs

Enable the L+ power supply outputs by setting their

respective EN_L+ register bits high.

CQ Line Driver Outputs

Enable the CQ line drivers either by input pin (using the

TXEN turrets and/or jumpers JP1/3/7/9) or via the SPI

interface(bysettingDRVENregisterbitshigh).SeeTable2.

Table 2. CQ Driver Mode Configuration

JP1/3/7/9

SETTING

TXEN

TURRET

DRVEN

BIT

CQ DRIVER

MODE

GND

EXT

L/H

OFF

OFF/ON

Control the output CQ states using the TXD turrets and/

or jumpers JP2/4/8/10. See Table 3.

Table 3. CQ Driver Output Level Configuration

JP2/4/8/10

SETTING

TXD

TURRET

DRVEN

BIT

CQ DRIVER

MODE*

LEVEL

GND

GND/VL

EXT

DB9

L/H

H/L**

OFF

H/L

* From Table 2

** RS232 transceiver U2 inverts

Alternatively, operate the CQ drivers solely via the SPI

interface by tying TXD low and controlling the DRVEN

switching at or below COM2 data rates (38.4kb/s).

TVS Protection

The CQ and L+ pins are protected by 36V TVS diodes for

cable-driving applications.

Serial Port

A DB9 connector enables CQ data to be sent (for one or

more ports) and received (for one port) using PC software

such as a serial terminal program. Jumper JP5 enables

the required RS-232 transceiver.

Select the desired combination of drivers by setting one

or more of JP2/4/8/10 to the DB9 position. Select one CQ

receiver using JP6.

L+ Isolation

If L+ isolation is not needed, Schottky diodes D1-D4 may

be replaced with 0Ω resistors.

Interrupts

The LTC2874 includes an open-drain interrupt line for

signaling the host controller when it needs service. This

signal is accessible on the DC1880A board at the IRQ test

point. An LED is also included for convenience.

dc1880af

DEMO MANUAL DC1880A

aDDitional information

Jumpers

JP1/3/7/9: Port 4/3/2/1 CQ Driver Enables. See Table 2.

Default position VL.

JP2/4/8/10: Port 4/3/2/1 Data Input to CQ Driver. See

Table 3. Default position GND.

JP6: RXDn COM Port Select. Determines which receiver

output (RXD1/2/3/4, if any) is connected to the serial port.

Default position RXD1.

JP5: COM PORT Enable. Connects RS232 transceiver U2

to VL logic supply. Default position ON.

JP11: VL Select. Programs LDO voltage to 2.9V(OPEN),

3.3V, 5V, or 5.5V. Default position 5V.

JP12: LDO On. Enables LDO which derives VL logic sup-

ply from VDD supply voltage input. Default position ON.

JP13: GND Shield. Shorts shields of J5-8 to GND. Default

position OPEN.

dc1880af

DEMO MANUAL DC1880A

using the Dc1880a software

Introduction

Linear Technology’s QuikEval software provides a quick

and easy way to evaluate most aspects of LTC2874 opera-

tion. It operates a SPI interface that reads or writes from

the 14 onboard registers via a DC590 serial controller.

Install QuikEval BEFORE connecting the DC1880A to the

USB port of the PC. Download and run the installation

program from http://www.linear.com/software and follow

the onscreen instructions. The LTC2874 GUI will launch

automatically when the PC begins communicating with

the DC1880A via the serial controller. Thereafter, start

the GUI by running QuikEval from:

C:\Program Files\LTC\QuikEval\quikeval.exe

If the QuikEval software was installed previously, update

it to the latest version using Tools > Update Program.

The LTC2874 GUI is composed of a main window having

three tabs, and a Register Map window. The Ports tab

(Figure2)containscontrolsandmonitorsthatareuniqueto

eachindividual port.The Timersand Globalstab (Figure3)

contains controls and monitors that are common to all

ports. The Events tab (Figure 4) provides access to event

monitoringregisters. The Register Map window(Figure 5)

provides access to all register bits via an alternate format.

TheLTC2874GUIbeginscommunicatingwiththeDC1880A

automatically. Once running, it continuously polls the

LTC2874 registers to monitor status.

Connect/Disconnect Button

TheDisconnectbuttondisablestheSPIinterface and most

of the GUI. The Connect button restarts SPI polling and

activates the complete GUI.

Reset Button

This button issues a SPI Reset command, returning all

registers to default values.

Events Tab

This tab contains lamps that map to Event Register bits.

A lamp that is on indicates that the corresponding bit in

the LTC2874 Event Register has been set. Clicking on a

lamp will clear the Event bit if the condition no longer

persists. Event Register behavior is sticky, meaning each

lamp stays on until cleared.

The check boxes control which events will cause IRQ to

signal.

Thiswindowpresentsallregisterbitsinanalternateformat.

Change register values directly by clicking on individual

bits, using arrow widgets, or by entering numeric values.

Changed bits appear yellow until either committed to the

LTC2874 by pressing the Write and Update button, or

clearedbypressingtheDiscardUnwrittenChangesbutton.

TheSaveCurrentValuesbuttonsavestheLTC2874register

values to a text file. The Load Saved Values button loads

theregister values from onesuchfileintotheRegisterMap

window. (Write and Update will then configure LTC2874

accordingly.)

Running QuikEval GUI Using Linduino One

The QuikEval GUI software for DC1880A may be operated

using a Linduino One (DC2026) with the DC590 emulator

sketchinplaceoftheDC590.WhenusingthisUSB-isolated

Arduino-compatibledemonstrationboard,settheDC1880A

LDO to 5V (JP11=5.0V) or disable it (JP12=OPEN).

dc1880af

DEMO MANUAL DC1880A

using the Dc1880a software

Figure 2. Main Window, Ports Tab

dc1880af

DEMO MANUAL DC1880A

using the Dc1880a software

Figure 3. Main Window, Timers and Globals Tab

dc1880af

DEMO MANUAL DC1880A

using the Dc1880a software

Figure 4. Main Window, Events Tab

Figure 5. Register Map Window

dc1880af

DEMO MANUAL DC1880A

troubleshooting guiDe

1. Problem: LTC2874 program doesn't download and

install automatically.

Solution: Get the latest QuikEval software either by

updating QuikEval from its pull-down menu (Tools >

Update Program), or by installing the latest version

directly from: www.linear.com/software.

2. Problem: DC590 controller board not detected.

(Error 1)

Solution: Connect to PC using USB A/B cable.

3. Problem: LTC2874 not detected. (Error 2)

Solution: Ensure that the DC590 ribbon cable is con-

nected and that VL power is applied. See Table 1.

4. Problem: Unsuccessful communication with the

LTC2874. (Error 5)

Solution: Check DC590 ribbon and USB connections.

Usually, this error indicates that one was disconnected

while the program was running.

5. Problem: Invalid value read from the LTC2874.

(Error 6)

Solution: Ensure VL supply power is applied correctly.

ReferringtoTable1,checkLDOjumperontheDC1880A

and JP6 on the DC590.

6. Problem: GUI is gray-colored and inactive.

Solution: Press Connect button.

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