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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TPS658621A датащи(PDF) 43 Page - Texas Instruments |
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TPS658621A датащи(HTML) 43 Page - Texas Instruments |
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43 / 107 page  SET O(BAT) ISET K I = R TPS658621A www.ti.com SLVSA58 – DECEMBER 2009 (2) where KSET is the charge current scaling factor in AΩ. The charge current is set by the resistor on the ISET pin and can be scaled via I2C register CHG1 bits ISET1[1:0] to a percentage (100%, 75%, 50% or 25%) of the value set by RISET. The ISET resistor will always set the maximum charge current if the AC input is selected. When the USB input is selected the maximum charge current will be defined by the USB input current limit and the programmed charge current. If the USB input current limit is lower than the IO(BAT) value, the battery switch will be set in the dropout region and the charge current will be defined by the input current limit value and system load, as shown in Figure 3-10. Figure 3-10. USB Supplement Mode 3.30 BATTERY VOLTAGE REGULATION, CHARGE VOLTAGE The Voltage regulation feedback is implemented by sensing the BAT pin voltage, which is connected to the positive side of the battery pack. The TPS658621A monitors the battery-pack voltage between the BAT and AGND1 pins. When the battery voltage rises to the VO(BATREG) threshold, the voltage regulation phase begins and the charging current tapers down. The charging voltage can be selected via I2C, with bits VCHG<1:0> (register VCHG1) and RSVD4B4 (register PPATH1, 0x4C) 3.31 LDO MODE OPERATION The LDO mode makes it possible to run critical subsystems connected directly to the battery node (BAT pin) when the battery is removed and the end equipment is powered by the AC or USB input. The SM2 voltage must be programmed by the host via register SUPPLYV2 control bits VSM2<4:0> to a value 100mv above the programmed charge voltage before the LDO mode is enabled, and it should be left at that value while LDO mode is in use. The SM2 voltage can be set to any other value after the LDO mode is disabled. The charger LDO Mode operation is enabled when termination is disabled (TERMOFF bit is 1 in CHG1) and thermistor removal detection is ignored (setting TSBYP bit to 1 in CHG2). Copyright © 2009, Texas Instruments Incorporated DETAILED DESCRIPTION 43 Submit Documentation Feedback Product Folder Link(s): TPS658621A |
Аналогичный номер детали - TPS658621A |
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Аналогичное описание - TPS658621A |
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