MAXIM DS2149DK, DS21349DK Technical data

K

查询DS21349DK供应商

www.maxim-ic.com

GENERAL DESCRIPTION

The DS2149DK/DS21349DK is a fully integrated
design kit for the DS2149 and the DS21349 T1/J1
line interface units (LIUs). It contains the necessary
circuitry to evaluate the device in all operation
modes, including running the device in hardware and
software mode.

DESIGN KIT CONTENTS

DS2149DK/DS21349DK Board
DS2149 28-Pin PLCC
DS21349 28-Pin PLCC

DS2149DK/DS21349D

T1/J1 Line Interface Unit

Design Kit

FEATURES

§ PLCC 28-Pin Socket for Multiple Part Evaluation

§ Bantam and RJ48 Connectors, Transformers,

and Termination Passives for LIU

§ Two Separate and Controllable Transmit Paths

for TTIP and TRING for Evaluating Multiple
Transformers

§ Equipment-Side Connector for External Data

Source/Sink or External Remote Loopback

§ On-Board T1 Crystal Oscillator

§ On-Board 8051 Microprocessor for Software

Mode Access

§ Connector Accesses to CS, SCLK, SDI, and

SDO for Firmware Development

§ Controllable 5V and 3.3V for VCC and IO Pins to

Support the DS2149 and DS21349 LIUs

ORDERING INFORMATION

PART DESCRIPTION

DS2149DK/
DS21349DK

T1/J1 Line Interface Unit Design Kit

1 of 14

REV: 032403

DS2149DK/DS21349DK T1/J1 Line Interface Unit Design Kit

COMPONENT LIST

DESIGNATION QTY DESCRIPTION SUPPLIER PART

C1 1

C3, C6, C9, C12,

C15–C17, C19

C4, C7, C10, C21 4

C5, C8, C11, C22,

C23

C13, C14 2
C18, C20 2 22pF capacitors (SMT80123) Digi-Key —

DS1–DS3, DS5 4 Red LED Digi-Key LN1251C

DS7 1 150-mil SO, DS87C520-ECL Dallas Semiconductor DS87C520-ECL

J1 1 Connector, RJ48, 8-pin Digi-Key 15-43-8588

J2, J3 2 Bantam connectors Digi-Key RTT34B02

J4–J11 8 COTO9802 Coto Technology COTO9802

J12 1

JP1 1 Pushbutton switch Digi-Key EVQPAE04M

JP2–JP6 5 100-mil SIP jumper 2 position Digi-Key —

JP7–JP10 4 100-mil SIP jumper 3 position Digi-Key —

PWR_CONNBAN2 1 Banana connector, 2-pin, red Mouser Electronics 164-6219

PWR_CONNBAN1 1 Banana connector, 2-pin, black Mouser Electronics 164-6218

R1–R3, R12, R14 5

R4, R5 2

R6, R7, R10, R11 4

R8, R9 2

R13, R15, R16 3

R17–R21 5

RN1, RN2 2

S1 1 9-pin DB9P connector Digi-Key 747459-1

SW1 1 10-position switch Digi-Key 435668-9

SW2 1 6-pin DPDT switch Digi-Key SSA22

T1 1 1:3 T1 transformer Pulse Engineering PE-64933

T2 1 1:2 T1 transformer Pulse Engineering PE-65771

T3 1 1:1 T1 transformer Pulse Engineering PE-64936

U1 1 PLCCSMT28T0T socket Pioneer Electronics PLCCSMT28T0T

U2, U5, U7 3

U3, U4, U6 3

U8 1 Darlington array Texas Instruments ULQ2003ADR

U9 1 150-mil SO, DS232AR Dallas Semiconductor DS232AR

U10 1 3.3V regulator Maxim MAX8887EZK33

X1 1 EC1-S-11.0592M XTAL low pro Digi-Key EC1-S-11.0592M

Y1 1 1.544MHz crystal oscillator Digi-Key NTH039A3-1.5440

0.001mF capacitor (SMT80123)

8

10mF capacitors (SMT80123)

0.1mF capacitors (SMT80123)

5

0.01mF capacitors (SMT80123)

10mF capacitors (SMT127240)

100-mil, 16-pin vertical
connector

300W resistors (SMT80123)

4.7W resistors (SMT80123)

0W resistors (SMT80123)

50.0W resistors (SMT80123)

10.0kW resistors SMT80123)

30W resistors (SMT80123)

1kW 10-pin resistor network

150-mil SO, 74HC04, hex
inverter
150-mil SO, 74HC03, open
collector NAND gate

Digi-Key —

Digi-Key —

Digi-Key —

Digi-Key —

Digi-Key —

Digi-Key —

Digi-Key —
Digi-Key —
Digi-Key —
Digi-Key —
Digi-Key —
Digi-Key —
Digi-Key —

Digi-Key TC74HC04AFN

Digi-Key SN74LS38D

2 of 14

DS2149DK/DS21349DK T1/J1 Line Interface Unit Design Kit

VDD

GND

BOARD FLOORPLAN

Figure 1 shows the board layout for the DS2149DK. The DS2149 PLCC socket is in the center of the board. The

line-side bantam connectors for the Tx and Rx differential pairs and transformers are at the bottom of the board,
while the system connector and configuration jumpers are at the top. The LEDs for INT, INLOOP, and RCL/QPD
are in the center of the board, right above the DS2149 socket. The power-supply connectors and power indicator
LED are in the upper left corner of the board, while the DB9 serial connector is the upper left. A T1 oscillator sits to
the left of the DS2149 socket below a switch for changing the voltage to the DS2149 socket from 5V to 3.3V.
Please refer to the general locations on the board when this document references specific items on the DS2149DK.

Figure 1. Board Floorplan

POWER JACKS

PWR

LED

SYSTEM CONNECTOR

LEDs

NLOOP

RCL

INT

SERIAL

PORT

Dallas

Semiconductor

DS2149DK/

DS21349DK

OSCILLATOR

T1

TRANSFORMERS

Tx

Tx

LINE CONNECTORS

DS2149

Rx

CONFIGURATION

JUMPERS

CONFIGURATION

SWITCHES

3 of 14

DS2149DK/DS21349DK T1/J1 Line Interface Unit Design Kit

LINE-SIDE CONNECTIONS

The DS2149DK/DS21349DK implements the Tx and Rx line interface networks recommended in the DS2149 and
DS21349 data sheets and as shown in Figure 2
equipment, connect the equipment to the RJ48 connector or to the two bantam connectors, J2 and J3. Please
notice the relays disconnecting TTIP and TRING on T1 and T2. These relays disconnect the series resistors R4
and R5, which is recommended for some long-haul configurations. Pin 16 on the system connector serves as the
control line for the relays. When pin 16 is high, T2 is enabled with TTIP and TRING. When it is held low, T1 is
enabled with TTIP and TRING.

Figure 2. Line-Side Circuitry

TRANSMIT

. To connect the DS2149DK/DS21349DK to T1 or J1 test

C2
1mF

TTIP

TRING

RECEIVE

R4

4.7W
(1%)

R5

4.7W
(1%)

Dallas

Semiconductor

DS2149/DS21349

RTIP

R9
50W
(1%)

RRING

R8
50W
(1%)

4 of 14

DS2149DK/DS21349DK T1/J1 Line Interface Unit Design Kit

SYSTEM CONNECTOR

A 16-pin system connector at the top of the board gives access to the following signals: RPOS, TPOS, RNEG,
TNEG, RCLK_CON, TCLK, MCLK, V

DD, GND, CS, SCLK, SDI, and RELAY_CONTROL. By using jumpers to

connect TCLK to RCLK_CON, TPOS to RPOS, and TNEG to RNEG, the system connector can also be used to
implement an external remote loopback. Additionally, the system connector can read and write to the device
without going through the on-board microcontroller. With this feature, you can quickly use this design kit as a
working prototype and begin writing firmware for your system. Figure 3

shows a representation of the system

connector.

Figure 3. System Connector

RPOS

TPOS
RNEG

TNEG

VDD

CS

SCLK
SDI

SDO

GND RCLK

GND TCLK

GND MCLK

RELAY_CONTROL

POWER-SUPPLY CONNECTORS

Connect a 5.0V power supply across the red (VDD) and black (GND) banana jacks. The red PWR LED indicates
power is applied to the board. Select the appropriate voltage that needs to be applied to VDD from the power
switch below the PWR LED, depending if you are using a DS2149 (5V) or DS21349 (3.3V).

MICROCONTROLER AND SERIAL CONNECTOR

The DS2149DK/DS21349DK contains an on-board 8051 microcontroller with factory-installed firmware loaded into
the microcontroller’s EPROM. This firmware translates memory access requests from the RS-232 serial port into
register access to the DS2149 or DS21349 in software mode. DemoView, a software application created by Dallas
Semiconductor, allows easy read-write access for this device.

INSTALLING AND RUNNING THE SOFTWARE

DemoView is a general-purpose program that supports several Dallas Semiconductor design kits. To install the
DemoView software, run SETUP.EXE from the DemoView.ZIP file. (Download DemoView.ZIP from our website,

www.maxim-ic.com/telecom

DS2149DK/DS21349DK board powered up and connected to the PC. In the opening screen, click the REGVIEW
button. Select the correct serial port in the Port Selection dialog box, then click OK. To configure DEMOVIEW to
support the DS2149DK/DS21349DK, open the File pulldown menu and select Definition File. In the Choose
Definition File dialog box, select DS2149DK.DEF and click Open.

After selecting the definition file, the main part of the REGVIEW window displays the DS2149’s memory map. To
select a register, click on it in the register map. When a register is selected, the full name of the register and its bit
map are displayed at the bottom of the REGVIEW window. Bits that are logic 0 are displayed in white, while bits
that are logic 1 are displayed in green.

The DemoView software supports the following actions:

§ Toggle a bit. Select the register in the register map and then click the bit in the bit map.

§ Write a register. Select the register, click the Write button, and enter the value to be written.

§ Write all registers. Click the Write All button and enter the value to be written.

§ Read a register. Select the register in the register map and click the Read button.

§ Read all registers. Click the Read All button.

.) After installation, run the DEMOVIEW.EXE program with the

5 of 14