SC662EVB Evaluation Board User’s Guide POWER MANAGEMENT Description Feature Content SC662EVB is the evaluation board for the SC662 Light Management Unit. The EVB is designed to provide a working demonstration of the SC662. This guide contains information relating to the usage of the EVB and should be used in conjunction with the datasheet for the device. The datasheet contains detailed information including the electrical characteristics and the detailed features of the device. This guide can be used to familiarize the user with the features of the device and for testing electrical characteristics of particular interest to the user. • • • • EVB Schematic EVB Bill of Material List EVB Layout Drawings EVB Operation Critical and Non-Critical Components The critical components necessary for design-in are shown in the image below next to the 2x2 (mm) SC662 device (not to scale). The bill of materials includes many non-critical components that are useful for evaluation purposes. SC662EVB August 26, 2010 © 2010 Semtech Corporation SC662EVB EVB Schematic 1 of 3 U1 4 S C 662 BL6 C1- BL5 5 C1 C2 1.0µF 1.0µF 6 7 SPIF 2 VIN C2- BL4 C2+ BL3 C1+ BL2 SPIF BL1 OUT VLDO 9 1 R6 D6 14 0Ω R5 D5 13 0Ω R4 D4 12 0Ω R3 D3 11 0Ω R2 D2 10 0Ω R1 D1 0Ω R7 8 C4 1.0µF IN PAD C3 VOUT GND 3 T2 1.0µF 0Ω GND 5V_USB V LDO R8 10kΩ R10 1kΩ R9 1kΩ SPIF SPIF SPIF_NOT 3 1 P0.2 GND 2 Q1 2N7002 3 1 2 Q2 2N7002 VLDO 5V_USB 5V_USB SC662 Enabled 662_LED_ENL D7 5V_USB R25 VLDO GND 300Ω SC662EVB EVB Schematic 2 of 3 5V_USB 5V_USB R24 10kΩ U2 15 16 17 18 19 20 21 22 C 801F 21 P0.7 P0.6 P0.5 P0.4 P0.3 P0.2 P0.1 P0.0 P1.7 P1.6 P1.5 P1.4 P1.3 P1.2 P1.1 P1.0 23 24 25 26 27 28 1 2 1 5V_USB R23 10kΩ P0.2 1 2 Q8 2N7002 5V_USB R22 10kΩ 4 D+ 5 D- P2.3 P2.2 P2.1 P2.0 5V_USB C5 4.7µF 11 12 13 14 R21 10kΩ SC560_EN 662_LED_ENL 5V_USB 8 VBUS 8051_P6 7 REGIN 6 VDD C6 0.1µF JP2 9 P2.1 1 RST/C2CK P3.0/C2D 10 P2.0 2 3 GND 3 3 1 2 1 R16 R30 20kΩ 9.76kΩ 2 Q6 2N7002 R15 Q7 2N7002 R14 118kΩ 5V_USB R20 10kΩ R13 Q5_Dr 3 1 2 237kΩ Q5 2N7002 Q4_Dr 3 1 2 Q4 2N7002 Program Port USB_Type-A_Plug J1 USB Power 1A F1 1 2 USB_D3 USB_D+ 4 FBA 59kΩ Q6_Dr 5V_USB R19 10kΩ 14.7kΩ Q9 2N7002 Q7_Dr 3 5V_USB USB_D+ USB_D- 2 Q8_Dr 3 R17 Q9_Dr 3 R12 475kΩ 5V_USB R18 10kΩ Q3_Dr 3 1 2 Q3 2N7002 R11 953kΩ 5V_USB SC662EVB EVB Schematic 3 of 3 U3 5V_USB 2 5V_USB R27 10kΩ SC560_EN 3 1 2 R26 LDO EN Q10 2N7002 300Ω VIN C7 2.2µF SC560_EN C9 22nF OUTA FBA 6 7 5V_USB D8 S C 60 EN OUTB BYP FBB GND 5 VLDO 3 4 1 8 R28 9.53kΩ C8 1.0µF FBA R29 4.99kΩ SC662EVB EVB Bill of Material List Reference Value Footprint Hardware Notes C1, C2, C3, C4 1.0μF 0603 C1, C2 are bucket capacitors C3 is input capacitor and C4 is output capacitor C5 4.7μF 0603 USB VBUS capacitor C6 0.1μF 0603 VDD noise filtering capacitor C7 2.2μF 0603 LDO input capacitor C8 1μF 0603 LDO output capacitor C9 22nF 0603 LDO noise filtering capacitor D1, D2, D3, D4, D5, D6 - 1206 White LEDs for backlight functions D7 - 0603 Green LED — SC662 enabled D8 - 0603 Green LED — LDO enabled F1 1A 1206 USB fuse J1 - 3_0.100 JP2 Not populated - Program port Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, 2N7002 - LDO programming switching transistors R1, R2, R3, R4, R5, R6 0Ω 0603 Sense resistors are in series with LEDs and are placed here (1.0Ω) recommended. R7 0Ω 0603 Resistor is in series with SC662 output. R8, R18, R19, R20, R21, R22, R23, R24, R27 10kΩ 0603 R9, R10 1kΩ 0603 R11 953kΩ 0603 R12 475kΩ 0603 R13 237kΩ 0603 R14 118kΩ 0603 R15 59kΩ 0603 R16 20kΩ 0603 R17 14.7kΩ 0603 R25, R26 300Ω 0603 USB type-A plug Pull-up resistors LDO program resistors Current limiting resistors for green LEDs SC662EVB EVB Bill of Material List (continued) Reference Value Footprint Hardware Notes R28 9.53kΩ 0603 R29 4.99kΩ 0603 R30 9.76kΩ 0603 VIN not populated - IN pin test point VOUT not populated - OUT pin test point SPIF not populated - SemPulse test point GND not populated - Ground test points (2) U1 SC662 MLPQ-2 x 2 14LEAD U2 C8051F321 - USB to SemPulse interface plus GPIO U4 SC560A - Adjustable LDO LDO program resistor Semtech integrated circuit Note: (1) Component references in BOLD indicate critical components SC662EVB EVB Layout Drawings — Top Layer (top view) EVB Layout Drawings — Bottom Layer (bottom view) SC662EVB EVB Layout Drawings — Layer 2 (top view) EVB Layout Drawings — Layer 3 (top view) SC662EVB EVB Operation SC662 EVB Software Installation SC662 Software Interface Functions The SC662EVB uses a USB compatible microprocessor to communicate SemPulseTM commands to the SC662. The software driver and executable program included in the SC662 GUI Kit should first be installed before connecting the EVB to a USB port. The Semtech SC662 SemPulse Evaluator program features are listed as follows. The following sequence is recommended. Run USBXpressinstaller.exe Place SiUSBXp.dll in the windows/system32 directory Place SC662.xml in the same folder as Semtech.exe Plug the EVB into a USB port and confirm that the USB device driver is found. USB 2.0 compliant A to A cable may be used to extend the board away from the PC for convenience when probing the EVB. Run Semtech.exe to start the user interface • • • • 1. Hardware Status — A green Link Status Activity indicator flashes continuously while USB is connected. The green light gives no indication of SemPulse activity. 2. Main Controls — These buttons are used to enable/ disable the SC662 and to exit the program. 3. SemPulse Speed — A pull down menu for setting the data rate of the SemPulse. The interface is capable of up to 1Mbps performance, however, the C8051 firmware has an approximate maximum speed of 300kbps. 4. Register Map (Write All) — One mouse click initiates writing to all registers. 5. Register Map (8 bit binary data) — Text color is red • 8 7 9 6 5 10 11 4 3 12 2 1 13 14 15 SC662EVB EVB Operation (continued) 6. 7. 8. 9. when data is in queue and green after sending. Register Map (Register address in hexadecimal notation) — One mouse click in this box will send the 8 bits of data located in the field to the right of register address field. Text color is red when data is in queue and green after sending. Backlight Bank Config. — Pull down menu allows the user to configure the LEDs as part of the main, sub, or third display banks. BL1 through BL6 On/Off Control — Enables and disables the backlights BL1 through BL6. Demos — This group in the upper left corner demonstrates functions using the SC662 from a single mouse click. Each button writes multiple SemPulse commands to re-configure the SC662. 1 Bank — Configures all backlights into one bank, sets the current to 15mA, and enables the LEDs. 2 Banks — Configures 3 backlights for the main bank and 3 backlights for the sub bank, sets main current to 15mA and sub current to 1.0mA, and enables the LEDs. Fade to 15mA — Sets the main fade control to 6ms per step and sets the main bank to 15mA. The main bank will then fade from the current active setting to 15mA. Fade to 0mA — Sets the main fade control to 6ms per step and sets the main bank to 0mA. The main bank will fade from the current active setting to 0mA. 2, 4, or 6ms per step. Many non-programmable steps are included when fading. Refer to the applications information in the datasheet for more details on the fade function. 14.Frequency Selection — The charge pump has two selectable clock frequencies, 250kHz and 1MHz. 250kHz provides slightly better quiescent current compared to 1MHz. 1MHz typically provides improved ripple performance compared with 250kHz. 15.LDO Supply Voltage — An adjustable voltage supply for the SC662 is provided by an on-board SC560A LDO. The LDO is programmable between 4.16V and 2.89V in increments of 10mV — the approximate range provided by a typical Li-Ion battery. Typical LDO output accuracy is 1%. The LDO output is provided as a tool to demonstate performance of the SC662 in each of charge pump modes, 1x, 1.5x, and 2x. The default state for the LDO is 4.16V when the main control is enabled. SC662 Evaluation and Measurement Tips This section provides setup information about the EVB. • • All Banks Off — Resets all registers to zero. The backlights will be disabled. 10.Main BL Current — Sets the current for main backlight LEDs between 0mA and 25mA. 11.Sub BL Current — Sets the current for sub backlight LEDs between 0mA and 25mA. 12.Third BL Current — Sets the current for third backlight LEDs between 0mA and 25mA. 13.Main Fade Control — Enables and disables the fade feature to the main display and sets the rate of fade to • Install the software and plug the EVB into a USB port. Suggestion: A USB A to A cable may be used to relocate the EVB away from the USB port for easier access to the board while taking measurements. R1, R2, R3, R4, R5, and R6 are zero ohm resistors in series between the sink pins (BL1 through BL6) and the LED cathodes of D1 through D6. The resistors may be removed for experimentation and replaced with 1Ω 1% sense resistors for measuring current with a voltmeter at 1mV/1mA. Test points are provided for voltage measurement at the right edge of the card (as shown on page 1) for SPIF, VIN, VOUT, and GND. 10 SC662EVB © Semtech 2010 All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent or other industrial or intellectual property rights. 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