Linear Technology DC2543A Kurzanleitung zur Einrichtung

dc2531f

DEMO MANUAL DC2531

Description

DC2508 and DC2210

LTC2986

Digital Temperature Measurement System

The DC2531 is the starter kit for demonstrating the per-

formance and ease of use of the LT C

2986, which is a

complete temperature measurement system on a chip.

This kit includes the DC2508 (main demo circuit contain-

ing the LTC2986) 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 DC2508 is a member of the QuikEval™ family of dem-

onstration boards. It is designed to allow easy evaluation

of the LTC2986 and may be connected to any one of the

sensor daughter boards.

These daughter boards allow evaluation of the various

LTC2986 sensor types (see Figure 1).

For the serial digital interface, the DC2508 may be con-

nected to the DC2026 Linduino™ One.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2531

Figure 1. DC2508 Temperature Measurement Demonstration Board

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DEMO MANUAL DC2531

Quick start proceDure

Connect one of the five sensor daughter boards (DC2210,

DC2211, DC2212, DC2213 or DC2214) to the DC2508

demo board. Connect the DC2508 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 LTC2986 demo program will be loaded

automatically. Refer to software manual LTC2986DSM

for more detailed information.

The demo software helps program and run the LTC2986.

It can configure the LTC2986, check and save the con-

figuration, run the LTC2986, 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 LTC2986 manually or automatically from

data stored in the daughter board EEPROM. Please see

www.linear.com/LTC2986software for the demo software

manual.Itincludesashorttutorialforgettingstarted.Figure

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

Figure 2. LTC2986 Demo Software

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DEMO MANUAL DC2531

HarDware setup

DC2210 EXPERIMENTER BOARD

(INCLUDED IN DC2531 KIT)

The DC2210 experimenter board (see Figure 3) brings

all LTC2986 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 LTC2986 inputs in this area. Figure 4 shows

the connection schematic of the DC2210 Experimenter

board. Please note that only CH1 to CH10 are valid on

the DC2210 when used in conjunction with the DC2508.

Figure 3. DC2210 Experimenter Board

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DEMO MANUAL DC2531

HarDware setup

Figure 4. DC2210 Experimenter Board Schematic

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DEMO MANUAL DC2531

HarDware setup

DC2211 UNIVERSAL TEMPERATURE MEASUREMENT

BOARD

Theuniversaltemperaturemeasurementboard(seeFigure

5) allows the user to connect any of the LTC2986 sup-

ported sensors to the DC2508 demo board.

Figure 5. DC2211 Universal Temperature Measurement Board

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DEMO MANUAL DC2531

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

LTC2986 demo software can read this EEPROM and use

to configure the sense resistor value in the LTC2986’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 LTC2986 CH2 as well as the low side of the on-board 2k

sense resistor

Position B LTC2986 CH3

Position C LTC2986 CH4

Position D LTC2986 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 DC2531

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).

• A4-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 DC2531

HarDware setup

Figure 8a. DC2211 Four Thermocouple Software Configuration

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DEMO MANUAL DC2531

HarDware setup

Figure 8b. DC2211 4-Wire RTD Software Configuration

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DEMO MANUAL DC2531

HarDware setup

DC2212 THERMOCOUPLE DAUGHTER BOARD

The thermocouple board (see Figure 9) demonstrates the

flexibility, accuracy, and low noise features of the LTC2986

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 LTC2986

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 LTC2986, 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

LTC2986, the thermocouple board provides a short to

ground on channel 5.

To demonstrate the accuracy of the LTC2986, the thermo-

couple board allows the user to connect a thermocouple

calibrator or an external voltage source to CH10 of the

LTC2986 through a pair of banana jacks (J4 and J5).

Figure 9. DC2212 Thermocouple Daughter Board

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