SML2120 SML2120EV

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SML2120 Evaluation Quik-Start User's Guide
SML2120EV
SML2120EVAL fully functional printed circuit board designed demonstrate features SML2120 Nonvolatile, Programmable Adaptive Laser Power Controller. SML2120EV designed operate from single +3.3V-+5V supply with dual supplies -5.2V +3.3V includes slide switch making selection. visible Laser with integral Monitor Diode included EVAL Board user SML2120 observe Several key, user-configurable functions are: Programmable BIAS current ranges/offsets Programmable Byte Look-Up Tables (LUT) User-Programmable sources LUTs Multiple supply voltage schemes (+3.3V-+5.0V 5.2V +3.3V) User-Programmable Alarm sources/events User-Programmable Byte Non-Volatile EEPROM corresponding changes. external temperature measurement devices included compensate Laser's light output over temperature. SML2120EVAL manages Laser's average output power, temperature aging compensation interfacing suitable high-speed Laser Driver. These functions easily programmable 2-wire interface.
Additional features included EVAL board: connect Power Signal pins User-Programmable Interface connector digitally control Laser intensity, Look-Up Tables, etc. Visible Laser Connectors Interface Laser Driver Status Indicator (LED) ALERT# Large ground plane minimizes voltage errors
SML2120EV User's Guide Table Contents
Operating Instructions (Pgs. Performance Measurements (Pgs. 3-6) SML2120EV Schematic (Pg.7) Layout Drawings (Pg. Bill Materials (vendor sources) (Pg. Comments Precautions (Pg. Dongle pin-out photo (Pg.
Evaluation Contents
Fully Functional SML2120 Evaluation Board. SML2120 Evaluation User's Guide. Dongle Programmer Interface Card. Dongle Interface Cable meter). CD-ROM containing: SML2120EV Gerber Files, Software, file, Application Notes/Briefs. Visit `www.summitmicro.com' current information.
VAPC Internal Reference 0.75V ENA# URST
urrent enerator Quick Start
Voltage onverter
BIASM
Bridge Circuit
Previo onversion
VBRIDG MIST
10-BIT
Scale Offset
parison
ltage Converter
High/Low Alarm Logic ALERT Serial Interface
dress ookup able
High/Low
Range
8-BIT Range
eneral Purp
Distribution
Range
Figure SML2120 Evaluation Board
©SUMMIT MICROELECTRONICS, Inc., 2004 www.summitmicro.com
Range
Figure SML2120 Simplified Block Diagram
Phone 408-436-9890 408-436-9897
Drive, Jose, 95131-2312 1/22/04
Voltage onverter EMPM urrent Generator urrent Generator ILU1
Previo onversion
SML2120EV Quik-Start User's Guide
Look Directly Into Laser!
Laser EVAL Board capable emitting adequate light power cause damage. protective eyewear when viewing Laser. Note: SML2120 device registers preconfigured with Default Configuration Settings shown SML2120 data sheet. Settings specific SML2120EV evaluation included Intel format file located programmed into SML2120 samples shipped with SML2120EV kit. Optional: Click `HEX' folder icon load `SML2120EV.Default Hex' file from CD-ROM drive. Optional: Click `Write Config' button. This configures SML2120 registers accurately monitor Laser bias current along with performing other supervisory functions. Hardware Note: Dongle interface generates impedance source power program SML2120. Ensure jumpers their correct position displayed Figure Connect 3.3V power source EVAL board follows: Connect terminal 3.3V supply `GND' connect opposite side where Dongle connector located. Connect terminal 3.3V supply either `VDD' connect pins. Ensure slide switch (SW1) slid `VCC/GND' position. Switch 3.3V power source Laser (U2) indicates that EVAL Board functional passing programmed BIAS current. Explore SML2120 features changing many configurable parameters. Confirm programmed settings agree with actual measurements. Observe functionality SML2120 varying settings confirming Laser intensity changes according programmed settings.
Operating Instructions
Test Equipment Required Personal Computer with Windows later O/S) parallel port. Power Supply, 3.3V, 500mA. Oscilloscope, Digital sampling, 4-channel High Accuracy (e.g., HP34401A equivalent) Test Steps Software setup Close open Windows application programs. Insert "SML2120EV Software" into CD-ROM drive. Follow installation instructions, rebooting computer when prompted. After computer reboots, perform full power shutdown install Dongle. Dongle installation caution when programming EVAL Board. Dongle supplies power board therefore turn Laser Caution: apply power sources SML2120 evaluation board while Dongle connected board. Remove existing cabling from computer's parallel port (LPT1). Connect Dongle parallel port. Insert Dongle cable onto SML2120 Evaluation board connector (pin board corresponds white wire with orange stripe, also SMX3200 Dongle Info Page SMX3200 Data Sheet ROM, site document package). Reapply power computer. After computer restarts, open `SML2120 Programmer' application program click `Standard Settings' button then `Read Config' button. dialog shown Figure will appear screen.
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SML2120EV Quik-Start User's Guide
Figure SML2120 Default Programmer Window with `Standard Settings' button depressed.
Performance Measurements
performance SML2120 best demonstrated applying varying temperature Laser while either measuring observing change intensity. SML2120 loop will sense change Laser current temperature change Monitor Diode adjust BIAS current accordingly keep Laser light output constant.
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SML2120EV Quik-Start User's Guide
Figure SML2120 Evaluation Board Schematic includes Laser thermistor.
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SML2120EV Quik-Start User's Guide
Figure SML2120 Evaluation Board Silkscreen (Not scale)
Figure SML2120EV Copper (Not scale)
Figure SML2120EV Bottom Copper (Not scale)
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SML2120EV Quik-Start User's Guide
Table SML2120 Evaluation Board Parts List Item DescriptionResistors 10K, 1/10W, 0805, 1/10W, 0805, 1/10W, 0805, 100K, 1/10W, 0805, 4.7K, 1/10W, 0805, 200, 1/10W, 0805, jumper, 1/10W, 0805, 20K, 1/10W, 0805, 155K, 1/10W, 0805, 10K, Thermistor, 0805, Capacitors 0.1uF, 50V, ceramic, X7R, 1206, 0.01uF, 50V, ceramic, X7R, 1206, 10pF, 50V, ceramic, X7R, 1206, Semiconductors LED, Red, 0805, Diode, Small Signal, 1N4148, Amp, Quad, LM324AM Laser, Red, Visible w/Monitor Diode SML2120 Hardware Inductor, Ferrite Bead, 0805 SMA, Female, Connector Connector, Test Point Connector, 18-pin, dual-row, 0.1" spacing (2-pin) Connector, 10-pin, dual-row, 0.1" spacing Jumper, 2-pin, 0.1" spacing Switch, Slide, DPDT, SML2120EV Printed circuit board Digi-Key, 160-1176-1-ND Digi-Key, 67-1500-ND Summit Micro Electronics (ALERT#)
Vendor Part Number
Ref. Des. R1-R3, R7R9, R11-R13, R16,
Digi-Key, 235-1029-ND
Digi-Key, 240-1007-1-ND Digi-Key, J502-ND Milmax, 0300-1-15-01-47-27-10-0 Allied, 670-0203 Allied, 670-0203 Digi-Key, 929955-06-ND Apem, MS-22 Summit Microelectronics
(IMODIN+, IMODIN-) TP1-TP17 (Various) J6-J8 (Various) (I2C) (Various) (VCC/GND, VEE/GND)
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SML2120EV Quik-Start User's Guide
Comments Precautions
SML2120 precision integrated circuit requiring certain attention spent with regards component selection printed circuit board layout ensure best possible performance. Since SML2120 handles only frequency component Laser's total current, layout critical would with high frequency Laser driver circuitry. However, care must taken introduce frequency modulation into Laser such good grounding practices order well connection between SML2120, Laser, Monitor Diode MODSET ILU1/2 outputs. This same care should taken when closing loop, namely ensuring low-level Monitor Diode current subsequent termination voltage kept away from high-speed, high current paths grounds. Another concern that power dissipation that occur when SML2120 managing Laser demanding 100mA Bias current. certain plenty copper lands ground pins assist removal heat from die. Finally, when driving Laser whether visible infrared take precautions necessary prevent damage. Check with Laser manufacturer recommendations suitable protection devices.
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SML2120EV Quik-Start User's Guide
View SMX3200 cable connector
Name Ground Ground Reserved Volts Reserved Volts Reserved Wire Color Code white orange orange white green green blue white blue brown white brown
SMX3200 wire color code Parallel Port Dongle
SMX3200 Cable Connector Figure SMX3200 Dongle Dongle Interface Cable
NOTICE
SUMMIT Microelectronics, Inc. reserves right make changes products contained this publication order improve design, performance reliability. SUMMIT Microelectronics, Inc. assumes responsibility circuits described herein, conveys license under patent other right, makes representation that circuits free patent infringement. Charts schedules contained herein reflect representative operating parameters, vary depending upon user's specific application. While information this publication been carefully checked, SUMMIT Microelectronics, Inc. shall liable damages arising result error omission. SUMMIT Microelectronics, Inc. does recommend products life support aviation applications where failure malfunction product reasonably expected cause failure either system significantly affect their safety effectiveness. Products authorized such applications unless SUMMIT Microelectronics, Inc. receives written assurances, satisfaction, that: risk injury damage been minimized; user assumes such risks; potential liability SUMMIT Microelectronics, Inc. adequately protected under circumstances.
Revision This document supersedes previous versions. Copyright 2004 SUMMIT Microelectronics, Inc.
trademark Philips Corporation. ©SUMMIT MICROELECTRONICS, Inc., 2004 www.summitmicro.com Drive, Jose, 95131-2312 1/22/04 Phone 408-436-9890 408-436-9897

SML2120 SML2120EV

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