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Evaluation Board User Guide UG-138 Evaluating the ADT7320/ADT7420 Temperature Sensors PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. A | Page 1 of 16
FEATURES
Supports the ADT7320 and ADT7420 temperature sensors Powered from USB port—no additional power supply required PC software for control of temperature sensors Supported operating systems: Windows 2000 and higher Additional external evaluation board for remote temperature measurements (ADT7x20EBZ) Additional external flex boards for faster thermal response EVALUATION KIT CONTENTS Fully fitted printed circuit board (PCB) with USB interface Additional external PCB Evaluation software CD USB cable Documentation Wiring guide OPTIONAL EQUIPMENT ADT7320FBZ flex board ADT7420FBZ flex board GENERAL DESCRIPTION This user guide describes the E VA L-ADT7x20EBZ, ADT7320FBZ, and ADT7420FBZ evaluation board hardware and software and includes detailed schematics and PCB layout artwork. The ADT7x20 ( E VA L-ADT7x20EBZ) evaluation board is a compact, easy-to-use platform for evaluating all features of the ADT7320 and ADT7420 temperature sensors. The ADT7x20FBZ flex boards are optional extras to the evaluation kit, which can be used as an extension to the ADT7x20 evaluation board or as standalone devices for interfacing with a microcontroller or FPGA. The evaluation kit allows the user to evaluate the performance of the ADT7320 and ADT7420 temperature sensors using a PC. The kit consists of two boards; a main board connected to the PC through the USB port and an external board. The external board and flex board are attached to the main board using wires that can withstand high temperatures, and can be used for remote temperature measurements in oil baths or ovens where the temperature exceeds the specifications of the USB cable. The evaluation software allows the user to select the main board or the external board, as well as the desired temperature sensor device. When using the ADT7x20 evaluation board, in addition to this user guide, the user should also consult the ADT7320 and ADT7420 data sheets (available at the Analog Devices, Inc., website, www.analog.com). 09023-001 Figure 1. ADT7x20 Evaluation Board—Main Board
UG-138 Evaluation Board User Guide Rev. A | Page 2 of 16 TABLE OF CONTENTS
REVISION HISTORY
8/13—Rev. 0 to Rev. A Added Optional ADT7320FBZ and ADT7420FBZ 12/12—Revision 0: Initial Version
- Configuration Register
- Temperature Monitor
- ADT7x20 Registers The evaluation software also has Easy Setup and Close options. Configuration Register This tab allows you full control over the configuration register of the selected device, as shown in Figure 7. At startup, the evaluation software initializes the configuration register to the default value of 0x90 (hexadecimal). For more details on how to set the configuration register, consult the device data sheet. 09023-005
Figure 7. Configuration Register Tab
- Temperature Threshold
- Temperature Value
- Set Temperature Limits
- Log Data
- Temperature Values T emperature Threshold If the temperature goes above or below the high and low limits defined in the Set Temperature Limits section or above the critical threshold, the Temperature High Limit Threshold, Temperature Low Limit Threshold, and Temperature Critical Threshold indicators appear green. T emperature Value This displays the actual ADC temperature in twos complement and degrees Celsius respectively. Set T emperature Limits This section allows you to update the high, low, critical, and hysteresis limits. These ADC values are loaded into the device. Because the conversion format is twos complement, any value over 4095 is a negative number. To change the value, you can use the arrow keys or type a number in the box to update the limits. The graph labeled Temperature Conversion Measurement displays the variation in time of the high and low temperature limits as well as the current temperature in twos complement format. At startup, the evaluation software initializes the tempera- ture limits registers (T HIGH, TLOW, TCRIT, and THYST) to the default values shown in Figure 6. 09023-006
Figure 8. Temperature Monitor
Table 1 is a wiring guide for the ADT7320FBZ and Table 2 is a wiring guide for the ADT7420FBZ. Table 1. ADT7320FBZ Wiring Guide Table 2. ADT7420FBZ Wiring Guide
Figure 11. ADT7x20 Evaluation Board Schematic—Main Board Temperature Sensor Circuit
Figure 12. ADT7x20 Evaluation Board Schematic—Main Board USB Controller Circuit
Figure 13. ADT7x20 Evaluation Board Schematic—External Board Circuit
Evaluation Board User Guide UG-138 Rev. A | Page 15 of 16
ORDERING INFORMATION
Table 3.Component Listing—Main Board Qty. Reference Designator Description Value Supplier/Ordering No.
2 C1, C2 50 V NPO SMD ceramic capacitor 22 pF Farnell 722005
1 C3 10 V SMD tantalum capacitor 47 μF Farnell 1432591
1 C4 10 V SMD tantalum capacitor 2.2 μF Farnell 498646
14 C5, C6, C7, C8, C9, C10, C12, C13,
C14, C15, C16, C18, C19, C20 16 V X7R multilayer ceramic capacitor 0.1 μF Farnell 1216538
3 C11, C21, C22 10 V SMD tantalum capacitor 10 μF Farnell 197130
1 C17 10 V dc Y5V ceramic capacitor 1 μF Farnell 3188840
1 D1 Green LED VLMP31G2J1 Farnell 1328320
2 D2, D3 Red LED VLMS31J1K2 Farnell 1328350
1 J1 USB mini-B connector 54819-0579 Digi-Key WM17116CT-ND
1 J2 10-pin terminal block N/A Farnell 9632179
2 Q1, Q2 Low power bipolar transistor BC807 Farnell 1081222
1 R1 SMD resistor 0 Ω Farnell 772227
1 R2 SMD resistor 10 kΩ Farnell 9330399
2 R3, R6 SMD resistor 100 kΩ Farnell 911471
2 R4, R5 SMD resistor 2.2 kΩ Farnell 196319
3 R7, R11, R13 SMD resistor 270 Ω Farnell 9331964
6 R8, R9, R10, R12, R14, R15 SMD resistor 10 kΩ Farnell 911355
1 U1 Temperature sensor IC ADT7320UPCZ Analog Devices ADT7320UPCZ
1 U2 Temperature sensor IC ADT7420UPCZ Analog Devices ADT7420UPCZ
1 U3 64 kB I2C serial EEPROM 24LC64 Digi-Key 24LC64-I/SN-ND
1 U4 Precision low dropout voltage regulator ADP3303AR-3.3 Analog Devices ADP3303ARZ-3.3
1 U5 Dual SPDT switch ADG787BRMZ Analog Devices ADG787BRMZ
1 U6 USB microcontroller CY7C6813-56LFC Embassy CY7C68013-56LFC
1 Y1 SMD crystal 24 MHz Farnell 9509658
Table 4. Component Listing—External Board
2 C2, C4 10 V SMD tantalum capacitor 10 μF Farnell 197130
2 D1, D2 Green LED VLMP31G2J1 Farnell 1328320
4 R1, R2, R4, R5 SMD resistor 10 kΩ Farnell 9330399
2 R3, R6 SMD resistor 270 Ω Farnell 9331964
Table 3. Component Listing—ADT7320FBZ Flexi Board
2 R1, R2 SMD resistor 10 kΩ Farnell 9330399
Table 4. Component Listing—ADT7420FBZ Flexi Board
1 U1 Temperature sensor IC ADT7420UPCZ Analog Devices ADT7420UPCZ
UG-138 Evaluation Board User Guide Rev. A | Page 16 of 16 RELATED LINKS Resource Description ADT7320 Product Page, ±0.25°C Accurate, 16-Bit Digital SPI Temperature Sensor ADT7420 Product Page, ±0.25°C Accurate, 16-Bit Digital I2C Temperature Sensor I 2C refers to a communications protocol originally developed by Philips Semiconductors (now NXP Semiconductors). ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality. Legal Terms and Conditions By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices, Inc. (“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal, temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONL Y. Customer understands and agrees that the Evaluation Board is provided for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted is expressly made subject to the following additional limitations: Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and (ii) permit any Third Party to access the Evaluation Board. As used herein, the term “Third Party” includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is NOT sold to Customer; all rights not expressly granted herein, including ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all be considered the confidential and proprietary information of ADI. Customer may not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of use of the Evaluation Board or termination of this Agreement, Customer agrees to promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited to soldering or any other activity that affects the material content of the Evaluation Board. Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS” AND ADI MAKES NO WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESUL TING FROM CUSTOMER’S POSSESSION OR USE OF THE EVALUATION BOARD, INCLUDING BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE AMOUNT OF ONE HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable United States federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of Massachusetts (excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby submits to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed. ©2013 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respec tive owners. UG09023-0-8/13(A)