DC2420A-KIT - LINEAR TECHNOLOGY

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DEMO MANUAL DC2420

DC2026

TO PC

USB PORT

14 CONDUCTOR

RIBON CABLE

DIRECT CONNECTION

TO DAUGHTER BOARD

Description

DC2399 and DC2210

LTC2984

Digital Temperature Measurement System

The DC2420 is the starter kit for demonstrating the per-

formance and ease of use of the LT C

2984, which is a

complete temperature measurement system on a chip.

This kit includes the DC2399 (main demo circuit contain-

ing the LTC2984) and the DC2210 (a simple experiment

circuit allowing bread boarding). In addition to the starter

demonstration kit, sensor specific demonstration boards

highlighting the performance of RTDs, thermistors, or

thermocouples are also available.

• Universal Temperature Measurement Board – DC2211

• Thermocouple Board – DC2212

• Dedicated RTD Board – DC2213

• Dedicated Thermistor Board – DC2214

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

QuikEval and Linduino are trademarks of Linear Technology Corporation. All other trademarks

are the property of their respective owners.

The DC2399 is a member of the QuikEval™ family of dem-

onstration boards. It is designed to allow easy evaluation

of the LTC2984 and may be connected to any one of the

sensor daughter boards.

These daughter boards allow evaluation of the various

LTC2984 sensor types (see Figure 1).

For the serial digital interface, the DC2399 may be con-

nected to the DC2026 Linduino™ One.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2420

Figure 1. DC2399 Temperature Measurement Demonstration Board

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DEMO MANUAL DC2420

Quick start proceDure

Connect one of the five sensor daughter boards (DC2210,

DC2211, DC2212, DC2213 or DC2214) to the DC2399

demo board. Connect the DC2399 to a DC2026 using

the supplied 14-conductor ribbon cable. Connect the

DC2026 to the PC using a standard USB A/B cable. Run

the QuikEval software which the latest version can be

downloaded from the Linear website at www.linear.com/

software. The LTC2984 demo program will be loaded

automatically. Refer to software manual LTC2984DSM

for more detailed information.

The demo software helps program and run the LTC2984.

It can configure the LTC2984, check and save the con-

figuration, run the LTC2984, output the results into a file,

and even create Linduino One ready C code based on

the configuration. The demo software allows the user to

configure the LTC2984 manually or automatically from

data stored in the daughter board EEPROM. Please see

www.linear.com/LTC2984software for the demo software

manual. It includes a short tutorial for getting started. Figure

2 shows a screenshot of the demo software at start-up.

Figure 2. LTC2984 Demo Software

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DEMO MANUAL DC2420

HarDware setup

DC2210 EXPERIMENTER BOARD

(INCLUDED IN DC2420 KIT)

The DC2210 experimenter board (see Figure 3) brings all

20 channels plus the COM connection out to a proto area

and a 24-position terminal block. The user may connect

any of the supported sensors and sense resistors to any

of the LTC2984 inputs in this area. Figure 4 shows the

connection schematic of the DC2210 Experimenter board.

Figure 3. DC2210 Experimenter Board

TO DC2399

DEMONSTRATION

BOARD

SCREW TERMINAL

ANY SENSOR INPUT

CH1-CH20, COM

PROTO AREA

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DEMO MANUAL DC2420

HarDware setup

Figure 4. DC2210 Experimenter Board Schematic

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DEMO MANUAL DC2420

HarDware setup

DC2211 UNIVERSAL TEMPERATURE MEASUREMENT

BOARD

The universal temperature measurement board (see Figure

5) allows the user to connect any of the LTC2984 sup-

ported sensors to the DC2399 demo board.

Figure 5. DC2211 Universal Temperature Measurement Board

TO DC2399

DEMONSTRATION

BOARD

UNIVERSAL INPUT

4X THERMOCOUPLES

THERMISTOR

3-WIRE RTD

4-WIRE RTD

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DEMO MANUAL DC2420

HarDware setup

The universal temperature measurement board has a

built-in sense resistor for RTD applications as well as a

cold junction sensor diode for thermocouple applications

(see Figure 6 for the DC2211 schematic diagram). The

sense resistor is a 2kΩ ±0.1% 10ppm/°C sense resistor

on channels 1 and 2 which may be used with any of the

supported RTD sensor types. The precise value of this

sense resistor is stored in an on-board EEPROM. The

LTC2984 demo software can read this EEPROM and use

to configure the sense resistor value in the LTC2984’s

configuration memory.

The external interface on the universal temperature mea-

surement board is an 8-position screw-terminal block

with the flowing pinout.

Table 1. DC2211 Terminal Connector Pinout

Position A LTC2984 CH2 as well as the low side of the on-board 2k

sense resistor

Position B LTC2984 CH3

Position C LTC2984 CH4

Position D LTC2984 CH5

Position E Common/Ground Connection

Position F Common/Ground Connection

Position G Common/Ground Connection

Position H Common/Ground Connection

R5, 100Ω

R4, 100Ω

R3, 100Ω

R2, 100Ω

R1, 100Ω

Figure 6. DC2211 Universal Temperature Measurement Board Schematic

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DEMO MANUAL DC2420

HarDware setup

UNIVERSAL TEMPERATURE MEASUREMENT

DAUGHTER BOARD EXAMPLES

• Four thermocouples connected to positions A-D with

the negative connections tied to positions E-H using the

on-board diode as cold junction sensor (see Figure 7a

for the schematic and Figure 8a for the corresponding

software configuration).

• A 4-wire RTD connected to positions A-D using the

on-board sense resistor as the ratiometric reference

(see Figure 7b for the schematic and Figure 8b for the

corresponding software configuration).

Figure 7. Universal Temperature Measurement Board Examples

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DEMO MANUAL DC2420

HarDware setup

Figure 8a. DC2211 Four Thermocouple Software Configuration

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DEMO MANUAL DC2420

HarDware setup

Figure 8b. DC2211 4-Wire RTD Software Configuration

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DEMO MANUAL DC2420

HarDware setup

DC2212 THERMOCOUPLE DAUGHTER BOARD

The thermocouple board (see Figure 9) demonstrates the

flexibility, accuracy, and low noise features of the LTC2984

thermocouple modes.

If the user wishes to connect external sensors to the

thermocouple board, two universal-type thermocouple

jacks (J2 and J3) are provided (see schematic diagram

Figure 10 and corresponding software configuration

Figure 11). The user may connect any of the LTC2984

supported thermocouples (B, E, J, K, N, R, S, or T) as well

as custom thermocouples through these jacks.

To demonstrate the flexibility of the LTC2984, the thermo-

couple board includes cold junction diodes (Q1 and Q2)

embedded in each thermocouple socket. Alternatively, a

4-wire PT100 RTD (R5) can be used as the cold junction

sensor for either or both thermocouples.

To demonstrate the low system noise and offset of the

LTC2984, the thermocouple board provides a short to

ground on channel 5.

To demonstrate the accuracy of the LTC2984, the thermo-

couple board allows the user to connect a thermocouple

calibrator or an external voltage source to CH10 of the

LTC2984 through a pair of banana jacks (J4 and J5).

TO DC2399

DEMONSTRATION

BOARD

THERMOCOUPLE

CALIBRATOR

THERMOCOUPLE

Figure 9. DC2212 Thermocouple Daughter Board

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DEMO MANUAL DC2420

HarDware setup

Figure 10. DC2212 Thermocouple Board Schematic

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DEMO MANUAL DC2420

HarDware setup

Figure 11. DC2212 Software Configuration

NOTE: Protection resistors not shown in configuration schematic

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DEMO MANUAL DC2420

HarDware setup

DC2213 DEDICATED RTD BOARD

The DC2213 dedicated RTD board (see Figure 12) dem-

onstrates the flexibility, accuracy, and low noise features

of the LTC2984 RTD sensor modes. The DC2213 provides

several circuits demonstrating the features of the LTC2984.

The DC2213 (see schematic diagram Figure 13 and cor-

responding software configuration Figure 14) provides a

2kΩ ±0.1% 10ppm/°C sense resistor on channels 2 and

3 which may be used with any of the RTD sensor circuits

on this board. An additional Kelvin connection is also

provided to this sense resistor on channel 1. The precise

measured value of this sense resistor is stored in an on-

board EEPROM which the LTC2984 demo software can

read and use to configure the sense resistor value.

To demonstrate the low system noise of the LTC2984,

the dedicated RTD board provides a 0°C PT100 simulator

(100Ω ±0.01% 10ppm/°C) on channels 3 to 6 configured

as a 4-wire sensor. In addition to this the user may use this

circuit to demonstrate how the rotated mode eliminates

measurement error introduced by parasitic thermocouples.

To facilitate this measurement, the DC2213 provides an

external thermocouple interface which acts as a parasitic

thermocouple.

TO DC2399

DEMONSTRATION

BOARD

JUMPER

BYPASS/ENABLE

PARASITIC

THERMOCOUPLE

PARASITIC

THERMOCOUPLE

3-WIRE OR 4-WIRE

RTD

Figure 12. DC2213 Dedicated RTD Board

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DEMO MANUAL DC2420

HarDware setup

To see the effects of parasitic thermocouples on non-rotated

measurement modes, first measure the on-board 0°C

PT100 simulator in a non-rotated configuration and see

the measurement error as the thermocouple’s temperature

changes. To see the benefit of the rotated measurement

mode, switch from the no rotation/sharing to the rotation/

sharing configuration and see the errors introduced by the

parasitic thermocouple minimized.

In addition to the fixed value RTD simulator, there is also

a variable resistor RTD simulator. This circuit can be used

to demonstrate the range of the various LTC2984 RTD

sensor modes as well as demonstrate the fault detection

capabilities of the LTC2984.

If the user wishes to connect an external RTD to the sensor

board, a 4-position terminal block is provided. The user

may connect any of the LTC2984 supported RTDs as well

as custom RTDs to the DC2399 demo board through this

interface. The interface may be configured for 3 or 4 wire

sensors. To demonstrate the accuracy of the LTC2984,

the user may also connect an RTD calibrator or precision

resistors to this interface.

Figure 13. DC2213 Dedicated RTD Board Schematic

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DEMO MANUAL DC2420

HarDware setup

Figure 14. DC2213 Software Configuration

NOTE: Protection resistors not shown in configuration schematic

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DEMO MANUAL DC2420

HarDware setup

DC2214 DEDICATED THERMISTOR BOARD

The DC2214 dedicated thermistor board includes several

circuits (see Figure 15) to demonstrate the flexibility, ac-

curacy, and low noise features of the LTC2984 thermistor

sensor modes.

The DC2214 provides a 10kΩ ±0.1% 15ppm/°C sense

resistor on channels 1 and 2 which is shared with all of

the thermistor sensor circuits on this board (see schematic

diagram Figure 16 and corresponding software configura-

tion Figure 17). The measured value of this sense resistor

is stored in an on-board EEPROM which the LTC2984

demo software can read and use to configure the sense

resistor value.

To demonstrate the low system noise of the LTC2984 the

dedicated thermistor board provides a 25°C 10k thermis-

tor simulator (10kΩ ±0.1% 15ppm/°C) on channels 2-4

configured as a differential sensor. In addition to this the

user may use this circuit to demonstrate how the rotated

mode eliminates measurement error introduced by parasitic

thermocouples. To facilitate this demonstration the DC2214

provides an external thermocouple interface which acts

as a parasitic thermocouple.

To see the effects of parasitic thermocouples on non-

rotated measurement modes, first measure the on-board

25°C 10k thermistor simulator in a no-rotation/sharing

configuration and see the measurement error as the

thermocouple’s temperature changes. To see the benefit

of the rotated measurement mode, switch to the rotation/

sharing configuration and see the errors introduced by the

parasitic thermocouple disappear (the effects are more

significant with lower excitation current).

The DC2214 also includes a 499kΩ (0.1% 15ppm/°C)

thermistor simulator on channels 9 and 10. Ideally, this

resistor simulates –30.59°C for a 44008 (30k) thermistor

and –51.94°C for a 44006 (10k) thermistor. Note, the 10k

thermistor reports the temperature, but also indicates a

soft fault since the temperature is below the thermistor’s

specified minimum temperature.

In addition to the fixed value thermistor simulators, there

is a variable resistor thermistor simulator as well. This

circuit can be used to demonstrate the range of the various

LTC2984 thermistor sensor modes as well as demonstrate

the fault detection capabilities of the LTC2984.

If the user wishes to connect an external thermistor to the

daughter board, a 2-position terminal block is provided.

The user may connect any of the LTC2984 supported

thermistors as well as custom thermistors to the DC2399

demo board through this interface. To demonstrate the

accuracy of the LTC2984, the user may connect external

resistance standards to this interface.

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DEMO MANUAL DC2420

Figure 15. DC2214 Thermistor Daughter Board

TO DC2399

DEMONSTRATION

BOARD

JUMPER

BYPASS/ENABLE

PARASITIC

THERMOCOUPLE

PARASITIC

THERMOCOUPLE

THERMISTOR

HarDware setup

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DEMO MANUAL DC2420

HarDware setup

Figure 16. DC2214 Dedicated Thermistor Board Schematic

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HarDware setup

Figure 17. DC2214 Software Configuration

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DEMO MANUAL DC2420

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

DC2399 Required Circuit Components

1 21 C1-C21 CAP., NP0, 100pF 100V, 5%, 0603 MURATA, GRM1885C2A101JA01D

2 7 C22, C24, C25, C30,

C31, C33, C34

CAP., X7R, 10µF 10V, 10%, 0805 MURATA, GRM21BR71A106KE51L

3 7 C23, C26, C27, C28,

C29, C32, C35

CAP., X7R, 0.1µF 25V, 10%, 0603 MURATA, GRM188R71E104KA01D

4 4 E1, E2, E3, E4 TURRET, TESTPOINT 0.064" MILL-MAX, 2308-2-00-80-00-00-07-0

5 1 J1 CONN., 40P, CON-HIROSE-FX2-40P-1.27DS HIROSE, FX2-40P-1.27DS

6 1 J2 CONN., HEADER 14POS 2MM VERT GOLD MOLEX, 87831-1420

7 1 R1 RES., CHIP, 1Ω, 1/10W, 5% 0603 VISHAY, CRCW06031R00FJEA

8 1 R2 RES., CHIP, 100k, 1/10W, 1% 0603 VISHAY, CRCW0603100KFKEA

9 3 R3, R4, R5 RES., CHIP, 4.99k, 1/10W, 1% 0603 VISHAY, CRCW06034K99FKEA

10 1 U1 I.C., LTC2984CLX, LQFP48LX-7X7 LINEAR TECH., LTC2984CLX

11 1 U2 I.C., 24LC025-I/ST, TSSOP8 MICROCHIP, 24LC025-I/ST

12 2 MH1, MH2 STANDOFF, NYLON, 0.25", 1/4" KEYSTONE, 8831 (SNAP ON)

DC2210 Required Circuit Components

1 1 C1 CAP., X7R, 0.1µF 25V, 10%, 0603 MURATA, GRM188R71E104KA01D

2 1 J1 CONN., 40P, CON-HIROSE-FX2-40S-DAUGHTER HIROSE, FX2-40S-1.27DS(71)

3 2 J2, J3 CONN., TERM BLOCK 2.54MM 12POS PHOENIX, 1725753

4 0 R1, R2 RES., 0603 OPT

5 1 R3 RES., CHIP, 4.99k, 1/10W, 1% 0603 PANASONIC, ERJ-3EKF4991V

6 1 U1 I.C., EEPROM 2KBIT 400KHz 8TSSOP MICROCHIP, 24LC025-I/ST

74 MH1-MH4 STANDOFF, NYLON, 0.25", 1/4" KEYSTONE, 8831 (SNAP ON)

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DEMO MANUAL DC2420

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-

tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

scHematic Diagram

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DEMO MANUAL DC2420

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com

 LINEAR TECHNOLOGY CORPORATION 2015

LT 0515 • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LT C ) provides the enclosed product(s) under the following AS IS conditions:

This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT

OR EVALUATION PURPOSES ONLY and is not provided by LT C for commercial use. As such, the DEMO BOARD herein may not be complete

in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety

measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union

directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.

If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date

of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU

OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS

FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR

ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LT C from all claims

arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all

appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or

agency certified (FCC, UL, CE, etc.).

No License is granted under any patent right or other intellectual property whatsoever. LT C assumes no liability for applications assistance,

customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.

LT C currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.

Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and

observe good laboratory practice standards. Common sense is encouraged.

This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LT C applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035