LP3944ISQEV

User's Guide SNVA096B – October 2004 – Revised April 2013 AN-1344 LP3944 Evaluation Kit 1 LP3944 Overview The LP3944 is an integrated device capable of independently driving eight LEDs. This device also contains an internal oscillator that provides all the necessary timing required for driving LED. Two prescaler registers along with two PWM registers provide a versatile duty cycle control. The LP3944 contains the ability to dim/blink LEDs in SMBUS/I2C applications. For more information, please refer to the LP3944 datasheet. 2 Evaluation Kit Overview LP3944 Evaluation Kit contains the evaluation board and PC software and supports complete functional evaluation of the LP3944. All functions of the chip can be programmed via the use of the I2C interface port. The PC software provided emulates the I2C bus communication protocol. Hand shaking logic to interface to PC’s parallel port and all necessary level shifting is provided. 3 Getting Started The following instructions show how to use the LP3944 evaluation kit in default conditions. Please use the ESD protection (ground cable) to prevent any unwanted damaging ESD events. Install the evaluation software on a PC by copying the “LP3944.exe” from the CD to the LP3944 folder in your computer. There are two ways to launch the software. One way is without the evaluation board. Another way is with the evaluation board connected to the cable. Launching the software without the evaluation board: 1. Start the software by double-clicking on its icon. A message will appear stating that the LP3944 board is not detected, and will ask if the user wants to switch to virtual LED mode. Click “Yes.” 2. The default conditions of the virtual LEDs are different than that of the LP3944. Please be aware that the virtual LEDs simulate the functionality of the LP3944, but they do not perform exactly to the specification. To truly evaluate the LP3944, please request for a LP3944 evaluation board. All trademarks are the property of their respective owners. SNVA096B – October 2004 – Revised April 2013 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated AN-1344 LP3944 Evaluation Kit 1 Getting Started www.ti.com Figure 1. LP3944 software in virtual LED mode with all LEDs turned on (this is no the default state) Launching the software with the evaluation board connected to the LPT cable: 1. Connect a power supply (typically 5V) to “VDD” and “GND” pins. Power supply’s negative terminal should be connected to “GND” and positive to “VDD”. This will provide power to the LP3944 and the LEDs. Jumper JP1 should be in the “VDD” position. For added flexibility, a separate power supply can be connected to “VEXT” to supply power to LEDs, with jumper JP1 in the “VEXT” position. 2. The evaluation board is now ready for operation. Turn on the power supply. 3. Connect the LPT cable to the evaluation board and the LPT port of your PC. 4. Start the software by double-clicking on its icon. 5. The evaluation kit is now ready to use and the LP3944 can be programmed and controlled through the PC software. 2 AN-1344 LP3944 Evaluation Kit SNVA096B – October 2004 – Revised April 2013 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated The Control Panel www.ti.com Figure 2. LP3944 software launched with evaluation board connected to LPT cable (in default state). 4 The Control Panel Individual LED settings—allows the user to program LED0 to LED7 by turning it on or off or dimming/blinking at a specified rate. DIM0 corresponds to the values programmed in PWM0 and PSC0 registers. DIM1 corresponds to the values programmed in PWM1 and PSC1 registers. The default state is off for all LEDs. DIM0—The sliding bars control the PSC0 and PWM0 registers. The PSC0 register is used to program the period of DIM0 (6.25 ms to 1.6s). The PWM0 register is used to program the duty cycle of DIM0 (0% to 100%). The default values are 6.25 ms and 50% duty cycle. DIM1—The sliding bars control the PSC1 and PWM1 registers. The PSC1 register is used to program the period of DIM1 (6.25 ms to 1.6s). The PWM1 register is used to program the duty cycle of DIM1 (0% to 100%). The default values are 6.25 ms and 50% duty cycle. Registers—This display shows the current status of the ten registers (in hex) in the LP3944. Registers 00 and 01 are read-only registers that can be updated by clicking on the buttons. The other registers can be updated by clicking on “Read All.” COMM—Message indicating proper/improper I2C communication. Upon successful communication, “Ack OK” with green background will be displayed. Otherwise, “NoAck” with red background will be displayed. Errors include absence of power supply to the evaluation board, absence of LPT cable connection, and wrong LPT port address. LPT Base—Three options for LPT port setting. Default value is 378. Demos to screen—By selecting this option, the individual LED settings panel will become active to reflect the states of LEDs in demos. Demo1—Music demo. Soundcard needed to activate the button to play. The LEDs are controlled by the amplitude of the music. Demo2—Music demo. Soundcard is needed to activate the buttons to play. The LEDs will light up in circle as music progresses. Demo3—Non-music demo to illustrate dimming effect of LEDs. Flash—The RGB LED will all turn on to create a flashlight effect. SNVA096B – October 2004 – Revised April 2013 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated AN-1344 LP3944 Evaluation Kit 3 Bill Of Material for LP3944 www.ti.com Auto Write On/Off—When auto write feature is on (the box is checked), any change will take place immediately. If auto write is off (the box is not checked), changes will take place only after pressing “Write All.” Any LED that is programmed while auto write is off will only take place if “Write All” button is pressed before auto write is on; otherwise, these LEDs will go back to their previous states. Reset—Resets the LP3944 in its default state and erases all previously programmed value on the control panel to reflect the LP3944 default state. Write All—All programmed values on the control panel will be executed when this button is pressed. Read All—All ten registers will be read from the chip to refresh the control panel when this button is pressed. Quit—Quits the program. 5 Bill Of Material for LP3944 Designator 4 Description Footprint Comment C1, C3, C4, C5, C6, C7 0.1 μF, ceramic 0805 TDK C2, C8 2.2 μF 0805 TDK R0, R1, R4, R6, R7 82Ω 0603 R2 121Ω 0603 R3 140Ω 0603 RSCL, RSDA 2.2k 0603 RA0, RA1, RA2 100k 0603 K1 DB25T D1, D2 SCHOTTKY Rectifier JP1 HEADER 2X2 LED0 - LED15 U2 805 2x On Semi MBRM120 green, red, blue or white 0805 2x Vishay or Osram Level Shifter 0.15" SOIC16 On Semi MC14504B U3 Level Shifter 0.15" SOIC16 On Semi MC14504B U4 3 state quad buffers 0.15" SOIC14 Fairchild MM74HC125M U1 LED driver RTW0024 TI LP3944 AN-1344 LP3944 Evaluation Kit SNVA096B – October 2004 – Revised April 2013 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated LP3944 Evaluation Board Schematic www.ti.com 6 LP3944 Evaluation Board Schematic RST L1 6 L0 6 C8 RA1 100k RA2 100k VDD R0 5 3 R1 3 RA0 100k 1 VDD 1 RGB LED 2.2 PF NC 13 14 12 11 10 9 8 7 L7 R7 L6 R6 6 LED5 LED6 S3 VEXT NC 15 A2 VLED JP1 2 4 NC LED7 S1 1 3 GND A1 S0 D0 16 A0 LED4 24 C5 NC LP3944 U1 5 23 VDD L2-4 RGB LED SHARP 6270A 21 LED3 0.1 PF NC 4 C1 2.2 PF 22 0.1 PF C6 0.1 PF C2 SDA 5 U3 MC14504B LEVEL SHIFTER 2 AOUT AIN 3 4 BOUT BIN 5 6 COUT 7 CIN 10 DOUT DIN 9 12 11 EOUT EIN 15 14 FOUT FIN VDD 16 V VCC 1 DD 8 GND MODE 13 NC 4 20 SCL 2 19 4 RSDA 2.2k 2 GND 9 NC Y3 8 LED2 A3 3 6 Y2 7 VDD 17 C3 10 A2 NC Y4 11 5 LED1 A4 12 18 3 Y1 4 C2 RST VDD 0.1 PF VDD C4 13 A1 2 DB25 C3 2 LED0 1 14 2 15 3 16 4 17 5 18 6 19 7 20 8 21 9 22 10 23 11 24 12 25 13 Data In S4 RSCL 2.2k 1 K1 C7 0.1 PF VDD U4 MM74HC125 BUFFERS 14 1 C1 VCC U2 MC14504B LEVEL SHIFTER Data out C0 3 AIN AOUT 2 Data 5 BIN BOUT 4 Clock Clk out C1 7 CIN COUT 6 9 10 DIN DOUT 12 C4 11 EIN EOUT 14 15 FIN FOUT 0.1 PF 1 V 16 V DD 13 CC 8 MODE GND D1 L5 R5 VLED R2 R3 R4 SNVA096B – October 2004 – Revised April 2013 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated AN-1344 LP3944 Evaluation Kit 5 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. 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