STW4102IQT STMicroelectronics, STW4102IQT Datasheet

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Dual USB/wall adapter Li-ion battery charger with gas gauge Features ■ Constant current constant voltage (CCCV) linear charger ■ Common or separate USB/wall adapter inputs ■ Fast charge current control for wall adapter and up to ...

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Contents Contents 1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

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STw4102 10.2 Register mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

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Block diagram 1 Block diagram Figure 1. Internal block diagram MAIN USBPWR PWRDETECTN EOCHG CVREF LDO LDODRV LDOFB VIO SCL SDA RESETN 4/34 DRIVER Main Power Device (max 1A) USB Power Device (max 500mA) Driver Main adapter Detect Voltage USB ...

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STw4102 2 Pin assignment P Table 1. Pin descriptions Pin # Pin name 1 MAIN 2 VOUT 3 USBPWR 4 DRIVER 5 LDODRV 6 LDOFB 7 ISET 8 CVREF 9 GND 10 CVIS 11 ICG+ 12 ICG- 13 C32KHZ 14 ...

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Absolute maximum ratings and operating conditions 3 Absolute maximum ratings and operating conditions Table 2. Absolute maximum ratings (AMR) Symbol V Maximum supply voltage on MAIN input MAIN V Voltage on EOCHG, LDODRV, DRIVER pins CC V Maximum supply voltage ...

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STw4102 4 Electrical characteristics Table 4. CC/CV charger - V specified) Symbol Supply (V from MAIN or USB) oper I Main or USB input operating current charger I USBPWR input standby current STBY I BSENSE input current batt_sense I BATT ...

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Electrical characteristics Table 4. CC/CV charger - V specified) (continued) Symbol Watchdog t Watchdog duration watchdog Input/output pins V Main charger supply voltage detection charger_det Main charger supply voltage detection V charger_det_hys hysterisis V USB supply voltage detection USB_det V ...

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STw4102 Table 6. Battery monitor - V Symbol Parameter POR_IS2+ Power ON reset threshold+ POR_IS2- Power ON reset threshold- Gas gauge A/D converter V Input offset voltage os_gg V Input voltage range in_gg I Current consumption dd_gg I Current consumption ...

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Electrical characteristics 2 Table timing - V = 2.8V Symbol F SCL clock frequency scl t Hold time (repeated) START condition hd,sta t LOW period of the SCL clock low t HIGH period of the ...

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STw4102 Typical performance curves Figure 3. Charger voltage vs. charge current (Main charge, 4.2V and 1A settings) 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0 200 400 600 Icharge (mA) Figure 5. Charge current vs. temperature (charge ...

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Electrical characteristics Figure 8. USB standby input current vs. temperature (charge disabled -50 - Temp (°C) Figure 10. Watchdog period vs. temperature (normalized to value at 25°C) 1.4 1.2 1.0 0.8 ...

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STw4102 Figure 13. Waveforms at USB plug-in Vusb Vbatt Ibatt Figure 14. Switching from USB charge to main charge Vmain Vbatt Ibatt 50µs/div Figure 15. Switching from main charge to USB charge Vmain Vbatt Ibatt 100µs/div Electrical characteristics 10ms/div 13/34 ...

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Application schematics 5 Application schematics 5.1 Charge from USB or wall adapter The MAIN input is used with either a wall adapter or a USB charger. The charge current can be programmed to 100 mA or 500 mA max for ...

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... One-time programming (OTP) options offer the ability to use an external power device or an external sense resistor to handle charge currents higher than 1 A from the wall adapter. These OTP options are set by STMicroelectronics at factory level. Figure 17. Charge using external power devices battery voltage ...

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Application schematics 5.3 Using LDO regulator to supply telephone from wall adapter The regulator with external power PMOS (M1) supplies the telephone while the battery is discharged or unplugged. When the charger is unplugged, the phone is supplied by the ...

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STw4102 6 Battery charger 6.1 Charge cycle The charge cycle is initiated when the presence of a power source on either the MAIN or USBPWR inputs is detected (the PWRDETECTN pin goes low), while the charger is enabled by the ...

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Battery charger 6.2 Trickle charge The trickle charge mode is enabled when the battery voltage V voltage threshold V above V , the trickle current generator is off and the battery is charged using the trickle constant current method. The ...

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STw4102 6.4 Charging from a USB port The MAIN or USBPWR input can be used to charge from a USB 2.0 port. When using the MAIN input, bit SEL_DC_USB (bit 5 of register REG_CHG0) must be set to 1. Charging ...

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Battery charger 6.7 Watchdog timer When the fast charge is active, a watchdog timer starts to prevent damage on the battery. The system controller refreshes the watchdog periodically in order let the charge continue. When the watchdog time elapses, the ...

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STw4102 7 Low drop-out regulator The purpose of the low drop-out regulator (LDO supply the phone directly from the wall adapter when the battery is low or not present. When the wall adapter is present, MOSFET is off ...

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Battery monitoring 8 Battery monitoring 8.1 Gas gauge The gas gauge is designed to monitor the battery capacity. A current sensing resistor (typically of 30 mΩ) is needed between the negative terminal of the battery and the ground. The sensing ...

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STw4102 approximately 250 microseconds must be respected between the time the RD_REQ bit is set and the actual register reading. The RD_REQ bit is automatically cleared after the transfer. A high value written to the RST_CHRG, RST_DCHRG or RST_COUNTER bits ...

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... Factory OTP options 9 Factory OTP options Table 14 summarizes the one-time programming (OTP) options offered by STMicroelectronics to customize the STw4102 at factory level. Table 14. Factory OTP options Option TRICKLE current (wall adapter charge only) TRICKLE threshold voltage MAIN input mode at powerup Watchdog state at powerup ...

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STw4102 interface 10.1 Read and write operations 2 The I C interface is used to control the charging and the gas gauge system compatible 2 with the I C specification of Philips (version 2.1). ...

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I C interface Figure 25. Byte write operation Start Device id 7 bits Start bit = SDAfalling when SCL=1 Stop bit = SDArising when SCL=1 Restart bit = start after a start 10.2 Register mapping The mapping of all ...

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STw4102 Table 19. REG_CHG0. address 0 (00h) Name CHARGERUN MAINDETECT USBDETECT VCHG SEL_DC_USB USB_ICHG Table 20. REG_CHG1. address 1 (01h) Name CHG_ENA Reserved FORCECHARGER UN SEL_IS Unused Table 21. REG_WDOG. address 2 (02h) Name WDOG_EN WDOG_TIME WDOG_RST Reserved WDOG_INT Unused ...

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I C interface Table 22. REG_CG. address 3 (03h) Name CG_ENA RST_CHRG RST_DCHRG RST_COUNTER RD_REQ CG_CAL CG_EOC Unused Table 23. REG_CHARGE_LOW. address 4 (04h) Name DATA[7..0] Table 24. REG_CHARGE_MID. address 5 (05h) Name DATA[15..8] Table 25. REG_CHARGE_HIGH. address 6 ...

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STw4102 Table 27. REG_DISCHARGE_MID. address 8 (08h) Name DATA[15..8] Table 28. REG_DISCHARGE_HIGH. address 9 (09h) Name DATA[23..16] Table 29. REG_CONVDATA_LOW. address 16 (10h) Name DATA[7..0] Table 30. REG_CONVDATA_HIGH. address 17 (11h) Name DATA[12..8] Not used Table 31. REG_CONVNUMBER_LOW. address 18 ...

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I C interface Table 33. REG_ADCTRL. address 20 (14h) Name ADPOWERON ONSTATE ADSTART ADRUN ADRESOLUTION ADCAL Not used Table 34. REG_ADDATA_LOW. address 21 (15h) Name DATA[7..0] DATA[6..0] Table 35. REG_ADDATA_HIGH. address 22 (16h) Name DATA[11..8] Not used 30/34 Power- ...

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... JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an STMicroelectronics trademark. ECOPACK specifications are available at: www.st.com. Table 36. ...

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Package information Figure 26. QFN24 package mechanical drawing Figure 27. QFN24 footprint 32/34 STw4102 ...

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... STw4102 12 Ordering information Table 37. Order code (1) Order code STw4102IQT 1. Order code for parts with standard configuration. Contact STMicroelectronics to get order codes for parts with specific configurations. 13 Revision history Table 38. Document revision history Date 17-Mar-2008 20-Mar-2008 Temperature range Package ° ° -30 C, +85 ...

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... Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. ...