Linear Technology DC2543A Quick setup guide

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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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HarDware setup
Figure 4. DC2210 Experimenter Board Schematic
J1
J2
J3

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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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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
J2
J1
R6
Q1
R5, 100Ω
R4, 100Ω
R3, 100Ω
R2, 100Ω
R1, 100Ω
Figure 6. DC2211 Universal Temperature Measurement Board Schematic

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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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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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Figure 10. DC2212 Thermocouple Board Schematic

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Figure 11. DC2212 Software Configuration

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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 LTC2986 RTD sensor modes. The DC2213 provides
severalcircuitsdemonstrating thefeaturesof the LTC2986.
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 LTC2986 demo software can
read and use to configure the sense resistor value.
To demonstrate the low system noise of the LTC2986,
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
measurementerrorintroducedby parasitic thermocouples.
To facilitate this measurement, the DC2213 provides an
external thermocouple interface which acts as a parasitic
thermocouple.
Figure 12. DC2213 Dedicated RTD Board

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HarDware setup
To seetheeffectsofparasiticthermocouplesonnon-rotated
measurement modes, first measure the on-board 0°C
PT100 simulator in a non-rotated configuration and see
themeasurementerroras the thermocouple’stemperature
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 LTC2986 RTD
sensor modes as well as demonstrate the fault detection
capabilities of the LTC2986. Please note that the variable
resistor feature of the DC2213 requires channel 11 and
will not work with the DC2508.
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 LTC2986 supported RTDs as well
as custom RTDs to the DC2508 demo board through this
interface. The interface may be configured for 3 or 4 wire
sensors. To demonstrate the accuracy of the LTC2986,
the user may also connect an RTD calibrator or precision
resistors to this interface.
Figure 13. DC2213 Dedicated RTD Board Schematic
J2
J3
JP1
R6
THIS FEATURE WILL NOT
WORK WITH THE
DC2508 BECAUSE
CHANNEL 11 IS NOT
PRESENT ON THE DC2508

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Figure 14. DC2213 Software Configuration

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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 LTC2986 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 thermistorsensorcircuitson thisboard(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 LTC2986
demo software can read and use to configure the sense
resistor value.
To demonstrate the low system noise of the LTC2986 the
dedicated thermistor board provides a 25°C10k 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
modeeliminatesmeasurementerrorintroducedby parasitic
thermocouples.To facilitate this demonstrationtheDC2214
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
LTC2986 thermistor sensor modes as well as demonstrate
the fault detection capabilities of the LTC2986.
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 LTC2986 supported
thermistors as well as custom thermistors to the DC2508
demo board through this interface. To demonstrate the
accuracy of the LTC2986, the user may connect external
resistance standards to this interface.

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Figure 15. DC2214 Thermistor Daughter Board
HarDware setup

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Figure 16. DC2214 Dedicated Thermistor Board Schematic

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Figure 17. DC2214 Software Configuration

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parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
DC2531 Required Circuit Components
1 21 C1 TO C11 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., LTC2986CLX, LQFP48LX-7X7 LINEAR TECH., LTC2986CLX
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, 0.1uF 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
7 4 MH1-MH4 STANDOFF, NYLON, 0.25", 1/4" KEYSTONE, 8831 (SNAP ON)