DC2399 LINEAR_DIMENSIONS | Alldatasheet
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14 CONDUCTOR
Description
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 cir cuit 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, L T , L TC, L TM, 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
for more detailed information. The demo software helps program and run the LTC2984. 2 shows a screenshot of the demo software at start-up. Figure 2. LTC2984 Demo Software
connection schematic of the DC2210 Experimenter board. Figure 3. DC2210 Experimenter Board
Figure 4. DC2210 Experimenter Board Schematic
ported sensors to the DC2399 demo board. Figure 5. DC2211 universal Temperature Measurement Board
Table 1. DC2211 Terminal Connector pinout Figure 6. DC2211 universal Temperature Measurement Board Schematic
- 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
Figure 8a. DC2211 Four Thermocouple Software Configuration
Figure 8b. DC2211 4-Wire rTD Software Configuration
Figure 10. DC2212 Thermocouple Board Schematic
Figure 11. DC2212 Software Configuration
several circuits demonstrating the features of the LTC2984. read and use to configure the sense resistor value. measurement error introduced by parasitic thermocouples. Figure 12. DC2213 Dedicated rTD Board
parasitic thermocouple minimized. capabilities of the LTC2984. resistors to this interface. Figure 13. DC2213 Dedicated rTD Board Schematic
Figure 14. DC2213 Software Configuration
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 (10 kΩ ±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.
Figure 15. DC2214 Thermistor Daughter Board
Figure 16. DC2214 Dedicated Thermistor Board Schematic
Figure 17. DC2214 Software Configuration
iTEM QTY rEFErEnCE parT DESCripTion ManuFaCTurEr/pa rT nuMBEr DC2399 required Circuit Components 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 MURA TA, GRM21BR71A106KE51L 3 7 C23, C26, C27, C28, C29, C32, C35 CAP., X7R, 0.1µF 25V, 10%, 0603 MURA TA, 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 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 U 1 I.C., EEPROM 2KBIT 400KHz 8TSSOP MICROCHIP, 24LC025-I/ST 4 MH1-MH4 STANDOFF, NYLON, 0.25", 1/4" KEYSTONE, 8831 (SNAP ON)
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
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 Ev aLuaTion purpoSES onL Y 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 P ARTY 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 DEM o 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 Copyright © 2004, Linear Technology Corporation