MAX1968 Evaluation MAX1968 evaluation kit) fully assembled tested

The Datasheet Archive - 100 Million Datasheets from 7500 Manufacturers.

MAX1968 Evaluation MAX1968 evaluation kit) fully assembled tested

Datasheet Thumbnail

Top Searches for this datasheet

19-2502; 6/02
MAX1968 Evaluation
MAX1968 evaluation kit) fully assembled tested board that implements switch-mode driver Peltier thermoelectric cooler (TEC) module. operates from single 3.0V 5.5V supply provides bipolar (max) output module. potentiometer, DAC, external source generates temperature set-point voltage. Thermal feedback from module compared set-point voltage generate current-control signal. MAX1968 accurately regulates current based this signal. When using DAC, connects parallel port computer running Windows® 2000. Software, included with kit, provides quick easy method control DAC. Note: Windows 2000 requires installation driver. Refer Win2000.pdf Win2000.txt located diskette. Output Current Operates from Single Supply (3.0V 5.5V) High-Efficiency Switch-Mode Design 500kHz 1MHz Switching Frequency Programmable Heating/Cooling Limit Current-Monitor Output SPITM-Compatible Serial Interface Easy-to-Use Menu-Driven Software Includes Windows 95/98/2000-Compatible Software Demo Board Surface-Mount Construction Fully Assembled Tested
Features
Evaluates: MAX1968
Ordering Information
PART MAX1968EVKIT TEMP RANGE 70°C PIN-PACKAGE TSSOP-EP*
Exposed pad. Windows registered trademark Microsoft Corp. trademark Motorola, Inc.
Component List
DESIGNATION DESCRIPTION 1µF, ceramic capacitors (1206) Murata GRM319R71C105K Taiyo Yuden EMK316BJ105KF C3216X7R1E105K 1µF, ceramic capacitors (0805) Murata GRM21BR71A105K Taiyo Yuden LMK212BJ105MG C2012X5R1A105K 10µF, 6.3V ceramic capacitors (1206) Murata GRM31CR60J106K Taiyo Yuden JMK316BJ106ML C3216X5R0J106M 0.01µF, ceramic capacitor (0603) Murata GRM188R71H103K Taiyo Yuden UMK107B103KZ C1608X7R1H103K DESIGNATION DESCRIPTION installed 0.1µF, ceramic capacitors (0603) Murata GRM188R71C104K Taiyo Yuden EMK107BJ104KA C1608X7R1C104K 0.022µF, ceramic capacitor (1206) 180µF, 6.3V, SP-capacitor Panasonic EEFUE0J181XR DB-25 male right-angle connector 3-pin headers installed 3.3µH, 3.5A inductors Sumida CDRH6D38-3R3NC bipolar transistors, SOT23 Central Semiconductor CMPT3904 Diodes Inc. MMBT3904 Fairchild MMBT3904 General Semiconductor MMBT3904
C10, C12, C13, C14,
C2-C6
JU1, JU2,
Maxim Integrated Products
pricing, delivery, ordering information, please contact Maxim/Dallas Direct! 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
MAX1968 Evaluation Evaluates: MAX1968
Component List (continued)
DESIGNATION DESCRIPTION 0.05 ±1%, 0.5W sense resistor (2010) Vishay Dale WSL2010 0.050 1.0% LRC-LR2010-01-R050-F 49.9k resistor (0603) 100k resistors (0603) installed 510k resistor (1206) resistors (0603) 100k resistor (0603) 10k, temp coefficient 25ppm/°C ±0.1% resistor (0805) DESIGNATION R15, R16, R17, R18, R19, None DESCRIPTION resistors (0603) 4.7k resistors (0603) potentiometer 240k resistor (1206) Switch, momentary, normally open MAX1968EUI, 28-pin TSSOP-EP, driver module MAX4475ASA, 8-pin MAX4477ASA, 8-pin dual MAX5144EUB, 10-pin µMAX, Shunts
R6-R9 R11,
Component Suppliers
SUPPLIER Central Semiconductor Diodes Incorporated Fairchild General Semiconductor International Resistive (IRC) Murata Panasonic Sumida Taiyo Yuden Vishay Dale PHONE 631-435-1110 805-446-4800 888-522-5372 760-804-9258 361-992-7900 770-436-1300 714-373-7366 847-545-6700 800-348-2496 847-803-6100 402-564-3131 631-435-1824 805-381-3899 760-804-9259 361-992-3377 770-436-3030 714-737-7323 847-545-6720 847-925-0899 847-390-4405 402-563-6296 WEBSITE www.centralsemi.com www.diodes.com www.fairchildsemi.com www.gensemi.com www.irctt.com www.murata.com www.panasonic.com www.sumida.com www.t-yuden.com www.component.tdk.com www.vishay.com
Note: Please indicate using MAX1968 when contacting these manufacturers.
MAX1968 Evaluation
Quick Start
Required Equipment
Before beginning, following equipment required: power supply capable supplying voltage between 5.5V Peltier module with thermistor (10k +25°C) digital voltmeter (DVM) Procedure MAX1968 fully assembled tested surface-mount board. Follow steps below verify board operation. turn power supply until connections completed: Place shunt across pins frequency 500kHz. Place shunt across pins select potentiometer. Place shunt across pins disable MAX1968 output. Obtain module specifications absolute maximum voltage, absolute maximum cooling current, absolute maximum heating current. these lower) limits MAX1968 MAXV, MAXIP (heating current), MAXIN (cooling current) inputs. Tables select resistors refer MAX1968 data sheet. Connect module OS1, OS2, THERM, GND. Typical connections most modules are: Module TEC- Module TEC+ Module thermistor THERM Second module thermistor Module case ground shield
Evaluates: MAX1968
Table Maximum Voltage
VMAXV 0.65 VTEC(MAX) 2.6V 49.9
Table Maximum Positive Current
ITECP(MAX) Short Open 49.9
Table Maximum Negative Current
ITECN(MAX) Short Open 49.9
voltage approximately 0.75V. This represents +25°C module. Enable MAX1968 moving shunt position. After enabling MAX1968, verify that THERM voltage converges toward set-point voltage (set 0.75V step after approximately 30s. connected backwards, THERM voltage moves away from 0.75V toward either 1.5V. this occurs, shut down MAX1968 reverse TEC+ TEC- connections Once operation verified, other temperatures with R22, DAC, external voltage applied SET-POINT-IN; approximately +10°C 0.5V approximately +40°C. slope approximately -14mV/°C.
Detailed Description
Voltage Current-Limit Settings
MAX1968 provides control maximum differential voltage maximum positive negative current. voltage MAXV MAX1968 sets maximum differential voltage. following equations voltage: Voltage MAXV:
VMAXV
sure check module specifications before making connections. Also, recommended that thermistor connected through shielded wire lowest noise. Connect SET-POINT-IN GND. Connect 3.3VDC 5VDC power supply with sufficient power rating GND. Turn power supply. Adjust until reads 0.75V. This adjusts point approximately +25°C.
Move positive lead THERM verify
VMAXV Maximum Voltage: TEC(MAX) components installed MAX1968
MAX1968 Evaluation Evaluates: MAX1968
VMAXV maximum voltage Table refer MAX1968 data sheet more information. voltages MAXIP MAXIN pins maximum positive (heating) negative (cooling) current through TEC. following equations currents: VMAXIP Voltage MAXIP: VMAXIN(V)
Jumper
Jumper sets switching frequency MAX1968. Positions frequency 1MHz. Positions frequency 500kHz.
Jumper
MAX1968 placed shutdown mode using jumper JU2. Table jumper settings.
Jumper
Jumper connects current-control input (CTLI) MAX1968 thermal loop circuit. thermal loop circuit compares thermistor feedback from module set-point voltage generate CTLI signal. drive CTLI directly, trace shorting apply voltage between CTLI pad; 1.5V CTLI sets current approximately voltage CTLI produces +3A, respectively. current changes proportionally with voltage applied CTLI. Note: current does reach maximum positive negative current limits lower values. Voltage Current-Limit Settings section refer MAX1968 data sheet more information.
Voltage MAXIN: Resistor values through should between 100k: Maximum Positive Current:
VMAXIP ITECP(MAX)(A) RSENSE
where RSENSE (R1) 50m: Maximum Negative Current: VMAXIN TECN(MAX) RSENSE
components installed MAX1968 limit maximum positive current maximum negative current -1.5A. Tables refer MAX1968 data sheet more information.
Jumper
Jumper JU4, positions connects thermal loop circuit. Connect parallel port computer software control DAC. Positions connect potentiometer thermal loop circuit. external voltage control thermal loop, remove shunt from apply voltage SET-POINT-IN pad. voltage 0.75V corresponds approximately +25°C; approximately +10°C 0.5V approximately +40°C. slope approximately -14mV/°C.
Table Jumper Selection
JUMPER JUMPER POSITION Trace Closed* Open FUNCTION MAX1968 switching frequency 1MHz. MAX1968 switching frequency 500kHz. SHDN high. MAX1968 enabled. SHDN low. MAX1968 disabled. Drive CTLI directly with voltage. Disconnects thermal-loop circuit. Thermal control loop closed. generate temperature setpoint. generates temperature setpoint. generates temperature setpoint. Voltage applied SET-POINT-IN generates temperature setpoint.
Switch
Switch resets 0.75V.
ITEC Current-Monitor Output
ITEC output provides voltage proportional actual current. VITEC when current zero. actual current 1.5V VTEC ITEC ITEC monitor cooling heating current through module. Positive values ITEC indicate heating typically connected modules. maximum capacitance that ITEC drive 100pF.
*Default position
MAX1968 Evaluation
Using Computer
Required Equipment
addition equipment listed under Quick Start section, following equipment necessary: computer running Windows 2000. Note: Windows 2000 requires installation driver; refer Win2000.pdf Win2000.txt located diskette. parallel printer port (this 25-pin socket back computer). standard 25-pin, straight-through, male-to-female cable (printer extension cable) connect computer's parallel port MAX1968 kit. MAX1968.EXE software program from floppy hard drive. Windows program manager program. desired, INSTALL.EXE program used copy files create icons them Windows 95/98/2000 start menu. uninstall program included with software. Click UNINSTALL icon remove software from hard drive. Connect 3.3VDC 5VDC power supply with sufficient power rating GND. Turn power supply. Start MAX1968 program opening icon start menu. program startup, software forces 0.75V, which corresponds approximately +25°C. Connect THERM verify voltage approximately 0.75V. This represents +25°C module. Enable MAX1968 moving shunt position. After enabling MAX1968, verify that THERM voltage converges toward voltage (0.75V) after approximately 30s. connected backwards, THERM voltage moves away from 0.75V toward either 1.5V. this occurs, shut down MAX1968 reverse TEC+ TEC- connections. Once operation verified, other temperatures with DAC. User Interface section.
Evaluates: MAX1968
Procedure Place shunt across pins frequency 500kHz. Place shunt across pins select DAC. Place shunt across pins disable MAX1968 output. Obtain module specifications absolute maximum voltage, absolute maximum cooling current, absolute maximum heating current. these lower) limits MAX1968 MAXV, MAXIP (heating current), MAXIN (cooling current) inputs. Tables select resistors refer MAX1968 data sheet. Connect module OS1, OS2, THERM, GND. Typical connections most modules are: Module TEC- Module TEC+ Module thermistor THERM Second module thermistor Module case ground shield sure check module specifications before making connections. Also, recommended that thermistor connected through shielded wire lowest noise. Connect cable from computer's parallel port MAX1968 kit. straight-through 25pin female-to-male cable. avoid damaging your computer, 25-pin SCSI port other connector that physically similar 25-pin parallel printer port.
User Interface
user interface easy operate. either mouse navigate. program DAC, enter ratio desired output voltage (VDAC) reference voltage (REF). equation below: Ratio where 1.5V. ratio must decimal number between Press Enter click Update button send data DAC. ratio 0.67 sets output which corresponds approximately +10°C. ratio 0.33 sets output 0.5V, approximately +40°C. slope approximately -14mV/°C.
MAX1968 Evaluation Evaluates: MAX1968
General-Purpose Utility
There methods communicating with MAX5144 DAC: through user-interface panel through general-purpose utility. This utility (Figure configures parameters such clock polarity (CPOL), clock phase (CPHA), chip-select (CS) polarity. fields where numbers required apply pins parallel port connector. utility handles data only byte (8-bit) format. Data longer than byte must handled multiple bytes. example, 16-bit word should broken into 8-bit bytes. write data slave device, enter data into field labeled Data Bytes Written. Each data byte should hexadecimal, prefixed separated with comma. Press Send button write data slave. read data from slave device, field labeled Data Bytes Written must contain hexadecimal values. Include same number bytes read from slave. Note: MAX5144 write-only device cannot read.
1.5V
SETPOINT-IN 1.5V CTLI
1.5V
TEC+
TEC-
THERM MAX1968
THERMISTOR THERMAL LINK
Figure Thermal Loop Functional Diagram MAX1968
MAX1968 Evaluation Evaluates: MAX1968
Figure Main Window MAX1968
Figure Utility Showing Settings Communicate with MAX1968
MAX1968 Evaluation Evaluates: MAX1968
180µF 6.3V MAXIP MAXV
49.9k
100k OPEN 100k
CTL1
SHORT TRACE)
CTL1
CTL1
MAXIN PVDD2 COMP MAX1968 PVDD1 PGND1 PGND1
100k
PGND2 PGND2 PVDD2 FREQ
OPEN 0.01µF OPEN
3.3µH
3.3µH
ITEC (TEC+) 10µF
ITEC
PVDD1 SHDN
0.05
(TEC-)
Figure MAX1968 Schematic
MAX1968 Evaluation Evaluates: MAX1968
J1-3 J1-11 J1-2 J1-4 J1-9 J1-18 J1-19 J1-20 J1-21 J1-22 J1-23 J1-24 J1-25 X_CS 4.7k 4.7k X_SCLK 4.7k X_DIN SCLK SCLK MAX5144 SET-POINT-IN SET-POINT-IN X_DIN X_SCLK X_CS J1-10 DB-25 CONNECTOR J1-1 J1-5 J1-6 J1-7 J1-8 J1-12 J1-13 J1-14 J1-15 J1-16 J1-17 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. 0.1µF 100k SET-POINT-IN 0.1µF U3-B 0.1µF
MAX4477
CTL1
U3-B-OUT SHORT TRACE) 510k
OPEN
0.1µF
MAX4475
0.1%
MAX4477
10µF 0.022µF
240k
THERM
U3-A
0.1µF
U3-B-OUT
Figure MAX1968 Schematic-Thermal Loop
MAX1968 Evaluation Evaluates: MAX1968
Figure MAX1968 Component Placement Guide- Component Side
Figure MAX1968 Component Placement Guide- Solder Side
Figure MAX1968 Board Layout (2oz Copper)- Component Side
Figure MAX1968 Board Layout (2oz Copper)- Ground Plane
MAX1968 Evaluation Evaluates: MAX1968
Figure MAX1968 Board Layout (2oz Copper)- Power Plane
Figure MAX1968 Board Layout (2oz Copper)- Solder Side
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 2002 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

MAX1968 Evaluation MAX1968 evaluation kit) fully assembled tested

Top Searches for this datasheet

Other recent searches