LP3947ISD-51EV

User's Guide SNVA093A – November 2004 – Revised April 2013 AN-1341 LP3947 Evaluation Board 1 LP3947 Overview The LP3947 is a complete charge management system that safely charges and maintains a one cell Li-Ion battery. The LP3947 offers the flexibility of programming charge current, battery regulation voltage and End Of Charge (EOC) termination selection through the use of I2C interface, or the part operates on default values. The LP3947 supports charging from USB port. For more information on these products, please refer to the data sheet. 2 Evaluation Kit Overview LP3947 evaluation kit supports complete functional evaluation of the power management IC. All user accessible functions of the circuit can be controlled and some parameters 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 LP3947 evaluation kit in default conditions. The battery charger on LP3947 operates in default mode independent of an external controller. Please use the ESD protection (ground cable) to prevent any unwanted damaging ESD events. 1. Connect a power supply (4.5V to 6.0V) to “Adaptor” and “GND” pins located at the upper section of the PCB. Power supply’s negative terminal should be connected to “GND” and positive to “Adaptor”. 2. Connect a Li-Ion battery pack to “BATT” and “GND” pin located at the lower section of the PCB. The battery pack’s negative terminal should be connected to “GND” and positive to “BATT.” 3. The evaluation board is now ready for operation. Turning ON the power supply will start the charge cycle if battery is not fully charged. 4. Install the evaluation software on a PC by following the instruction on the “Evaluation Board Software Installation” section. 5. To control and program other functions and parameters available on LP3947, connect the LPT cable to the evaluation board and the LPT port of your PC. 6. Start the software by double-clicking on its icon. 7. The evaluation kit is now ready to use and the LP3947 can be programmed and controlled through the PC software. 4 Evaluation Board Software Installation Install the evaluation software on a PC by copying the “LP3947cp.exe” from the CD to the LP3947 folder in your computer. Double click on the software icon to start the software. 5 The Control Panel The LP3947’s parameters can be controlled from this control panel. The software permits the flexibility of programming in hex codes as well as the convenience of a menu driven operation. All trademarks are the property of their respective owners. SNVA093A – November 2004 – Revised April 2013 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated AN-1341 LP3947 Evaluation Board 1 Selecting Between AC Adaptor and USB Power Port www.ti.com When the LP3947 is powered up initially, it operates on default values as shown. 6 Selecting Between AC Adaptor and USB Power Port The LP3947 is designed to accept charging from either AC adaptor or USB port. A simple external circuit is used to allow simultaneous connection from the two sources, with AC adaptor taking priority over USB power port. When charging from an AC adaptor, the “MODE” pin should be set high. In AC adaptor mode, the LP3947 can charge using default values of 500 mA charge current, 4.2V termination voltage and 0.1C EOC, or it can be programmed via I2C to change these parameters. For more detail, please refer to the LP3947 datasheet. When charging from a USB power source, the “MODE” pin should be set low. In USB mode, only 100 mA and 500 mA charge current is allowed. In USB mode, charge always starts with 100 mA (the “ISEL” pin is pulled high). To change charge current to 500 mA, set the “ISEL” pin to low. Once “ISEL” pin is set to low, it is possible to program charge current to other values using I2C. 7 Using Thermistor Interface The LP3947 continuously monitors the battery temperature by measuring the voltage between the Ts pin and ground. Thermistor pin from the battery pack is connected to the Ts pin. An external resistor, Rs, is connected to VT pin. These two resistors create a voltage divider that feeds into two comparators inside the LP3947. Depending on the battery temperature, the voltage divider creates a voltage that may be inside or outside the comparators’ window (2.427V to 1.390V). If the voltage is inside the comparators’ window, battery temperature is within the temperature range that allows charging. If it is outside, charging suspends and both LEDs turn on. In the case where there is no battery, Ts pin is floating. This forces the LP3947 into LDO mode. In the LDO mode, BATT pin acts like a battery providing 4.2V (or 4.1V) and up to 1.2 AMP of current. 8 LP3947 Evaluation Board Schematic The evaluation board with I2C interface has circuit inside the dashed box assembled. The evaluation board without I2C interface does not have circuit inside the dashed box assembled and resistors RSCL and RSDA are connected to ground. 2 AN-1341 LP3947 Evaluation Board SNVA093A – November 2004 – Revised April 2013 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated Vbatt Vchgin LP3947 Evaluation Board Schematic Q1 MOSFET P D5 D6 D7 S6 S7 S5 S4 U3 C1 1 2 SCL 3 Data VDD C2 0.1 PF 3 5 7 9 11 14 1 13 Ain Bin Cin Din Ein Fin VCC Mode Aout Bout Cout Dout Eout Fout VDD GND 13 C3 0.1 PF U1 1 Vbatt A4 2 11 A2 Y2 A3 GND Y3 MM74HC125 BUFFERS 10 RSDA 2.2k 3 9 SDA 4 Vbatt 8 5 BATT C4 10 PF 6 7 LP3947 EN CHG-IN SCL ISEL SDA CHG BATT GND Vt EOC VBsense MODE MC14504 Modes: Mode 1 (VCC) TTL > CMOS MC14504B CMOS > TTL AC Mode 0 (VSS) CMOS > CMOS 2 4 C5 1 PF 14 VDD 12 Y4 C3 6 SDA 7 2 4 6 10 12 15 16 8 VCC A1 5 U4 R3 10k RSCL 2.2k C4 Y1 C2 4 R7 OPEN AC Adaptor 2 Clock MC14504B TTL > CMOS D2 AC SCL Vbatt 2 4 Vchgin D1 VDD 2 4 6 10 12 15 16 8 Ts Diff Amp 14 13 ISEL_H/ISEL_LOW D4 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 Aout Bout Cout Dout Eout Fout VDD GND Ain Bin Cin Din Ein Fin VCC Mode 1 C0 C1 D0 S3 D1 C2 D2 C3 D3 3 5 7 9 11 14 1 13 2 4 1 3 0.1 PF K1 JP2 D3 SCHOTTKY DIODE USB Port JP1 Vbatt 1 3 VDD EN C1 1 3 www.ti.com R5 1k R6 1k CHG EOC 12 11 10 Ts 9 8 Diff Amp R4 3.1k R9 9.2k R8 10k DB25T Table 1. Bill of Material for LP3947 Designator Description Footprint Comment C1, C2, C3 0.1 µF, Ceramic 0805 TDK C2012X7R1H104K C4 10 µF, Ceramic 0805 TDK C2012X5R0J106M C5 1 µF, Ceramic 0805 TDK C2012X5R0J105M RSCL, RSDA 2.2k 0805 R4 3.1k 0805 R3, R8 10k 0805 R7 open R5, R6 1k R9 (between Ts and ground pins) 9.2K D1, D2, D3 SCHOTTKY Rectifier 0805 2x On Semi MBRM120 CHG Red LED 0805 2x Vishay TLMT3100 EOC Green LED 0805 2x Vishay TLMC3100 EN, ISEL_L HEADER 2X1 JP1, JP2 Jumper from pin 1 to 2 Q1 MOSFET Switch K1 DB25T U1 Battery Charger NHE0014A TI LP3947 U2 Level Shifter 0.15″ SOIC16 On Semi MC14504B U3 3 State Quad Buffers 0.15″ SOIC14 Fairchild MM74HC125M U4 Level Shifter 0.15″ SOIC16 On Semi MC14504B 0805 Through Hole SPC Tech SOT23–5 Temic Si3441DV SPC Tech SNVA093A – November 2004 – Revised April 2013 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated AN-1341 LP3947 Evaluation Board 3 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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