Using the LM3565 Evaluation Module User's Guide Literature Number: SNVU195A FEBRUARY 2013 – Revised MAY 2013
User's Guide SNVU195A – FEBRUARY 2013 – Revised MAY 2013 LM3565EVM User's Guide 1 Introduction The Texas Instrument LM3565EVM evaluation module (EVM) helps designers evaluate the operation and performance of the LM3565 4MHz High-Current LED driver. The device offers configurability via I2Ccompatible interface. It can be enabled in Flash or Torch mode via the I2C interface or externally using the Strobe and Torch pins. The module utilizes two LEDs (D1 & D2) mounted on the EVM.
Setup www.ti.com Figure 2. VIO Jumper Settings J5 - LEDs - is the jumper used to connect the on-board flash LEDs to the LED output of the driver. STROBE - This pin provides an external method for initiating a flash or torch event. The STROBE pin is connected to ground via a 300 KΩ resistor internal to the LM3565. To externally drive this pin, either connect a control signal directly to the STROBE pin of the connector or place a jumper between connector pins STROBE and PWM0.
Board Layout www.ti.com Figure 5. TX Jumper Settings SDA / SCL - These connections allow the user to externally control the I2C lines. For independent control of the I2C lines, do not connect the VIO jumper to either the 3.3V or the VIN pin. VOUT / VLED - These provide access to the regulated output of the driver and the output of the LED current source. The user can measure VOUT with reference to GND, VLED with reference to GND and current source headroom directly between VOUT and VLED. 2.
Board Layout www.ti.com Figure 6. Top Assembly Layer Figure 7.
Board Layout www.ti.com Figure 8. Top Layer Routing Figure 9.
Board Layout www.ti.com Figure 10. Middle Layer 2 Routing Figure 11.
Schematic 4 www.ti.com Schematic GND J3 J15 J16 PWM0 1 2 VIN J1 1 2 1 2 J2 3 J4 3.3V PWM2 SCL 1 2 3 5 7 4 6 8 10 9 PWM1 GND SDA GND 30310-6002HB SW L1 J8 PWM0 TORCH B1 VIN SW1 B2 A2 A1 D3 A3 PWM C1 0.
Schematic www.ti.com Table 2. Bill of Materials Item Designator 1 AA1 2 Description Manufacturer Part Number Quantity Printed Circuit Board TBD by TI 551600803-001 REV A 1 C1 CAP, CERM, 0.1 µF, 16V, X7R 10%, 0402 Murata GRM155R71C104KA88D 1 3 C2 CAP, CERM, 10 µF, 6.3V, X5R 20%, 0603 Murata Electronics GRM188R60J106ME47D 1 4 C3 CAP, CERM, 100 µF, 6.
USB Interface Board and I2C-Compatible Interface Program www.ti.com Table 2. Bill of Materials (continued) Item Designator 27 J15 Header, TH, 100mil, 2x1, Gold plated, 230 mil above insulator Samtec, Inc. TSW-102-07-G-S 1 28 J16 CONN HEADER 10POS DL STR GOLD 3M 30310-6002HB 1 29 L1 Inductor, Metal Alloy, 1.0 µH, 3A, 0.059Ω, SMT TOKO 252012C 1 30 R1 RES, 1.0 kΩ, 5%, 0.1W, 0603 Vishay-Dale CRCW06031K00JNEA 1 31 R2 RES, 1.0 kΩ, 5%, 0.
USB Interface Board and I2C-Compatible Interface Program www.ti.com Figure 13.
USB Interface Board and I2C-Compatible Interface Program www.ti.com The above image shows the default settings. “Strobe Enable” (bit7 in register 0x06) is set, so only STROBE operations are allowed in the default settings. The “Simple I2C Interface” fields may be used to write or read any LM3565 register. Figure 14. Simple I2C interface Fields 5.1 Current Set Register (0x02) Use the dropdown menus to select the desirable flash current and torch current.
USB Interface Board and I2C-Compatible Interface Program www.ti.com Figure 15.
USB Interface Board and I2C-Compatible Interface Program 5.2 www.ti.com TX Mask Register (0x02) If the “TX Mask Enable” bit is set, the programmed flash current will be reduced by the amount selected in the “TX reduction” drop-down menu, if the voltage on the TX pin is logic high. Use the “Current limit” drop-down menu to select among the 4 available current limit settings. If the “Ext Torch” bit is set (default), the Torch pin can be used to turn on the part in torch mode by setting it to logic high.
USB Interface Board and I2C-Compatible Interface Program www.ti.com 5.3 Low-Voltage Register (0x03) If the “Low V Flash Enable” bit is set, the programmed LED current will be reduced by the amount selected in the “Flash reduction” dropdown menu, if the battery voltage drops below the threshold selected in the “Low V Threshold” menu. The “Sftwr Reset” bit can be used to reset all LM3565 registers to their default values.
USB Interface Board and I2C-Compatible Interface Program 5.4 www.ti.com Flash Duration Register (0x04) This register sets the LM3565’s flash duration. The register value and the corresponding time setting are displayed. Figure 18. Flash Duration Register 5.5 Strobe Register (0x05) If “Strobe Enable” is selected, only STROBE operations are allowed. Deselect this button to turn the part on/off using only I2C commands.
USB Interface Board and I2C-Compatible Interface Program www.ti.com Figure 19. Strobe Register 5.6 Output Mode Register (0x07) Use these buttons to enable the LM3565 in Flash, Assist or Memory Interface mode. The mode buttons can also be used to independently select modes and enable the part. Use the OFF button to clear the register.
USB Interface Board and I2C-Compatible Interface Program www.ti.com Figure 20. Output Mode Register 5.7 Fault Register (0x08) The contents of the LM3565 fault register are read upon clicking the “Read Flags” button. The register is cleared upon read back.
USB Interface Board and I2C-Compatible Interface Program www.ti.com Figure 21.
USB Interface Board and I2C-Compatible Interface Program 5.8 www.ti.com ADC Register The LM3565 ADC will read and store battery voltage and LED voltage information during a flash or assist event, if the “Vin measure” and “Vled measure” buttons are selected, respectively. The contents of these readings are stored in registers 0x0A and 0x0B. Click on “Read ADC” button to display the readings. Figure 22.
EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions: The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims arising from the handling or use of the goods.
FCC Interference Statement for Class B EVM devices This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
【Important Notice for Users of this Product in Japan】 】 This development kit is NOT certified as Confirming to Technical Regulations of Radio Law of Japan If you use this product in Japan, you are required by Radio Law of Japan to follow the instructions below with respect to this product: 1. 2. 3. Use this product in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal Affairs and Communications on March 28, 2006, based on Sub-section 1.
EVALUATION BOARD/KIT/MODULE (EVM) WARNINGS, RESTRICTIONS AND DISCLAIMERS For Feasibility Evaluation Only, in Laboratory/Development Environments. Unless otherwise indicated, this EVM is not a finished electrical equipment and not intended for consumer use.
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. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.
