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TPS658620ZQZT датащи(PDF) 45 Page - Texas Instruments |
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TPS658620ZQZT датащи(HTML) 45 Page - Texas Instruments |
45 / 104 page ![]() 3.38 TIMER FAULT RECOVERY 3.39 DYNAMIC TIMER CONTROL 3.40 BATTERY DISCHARGE SWITCH 3.41 CHARGER STATUS TPS658620 Advanced Power Management Unit www.ti.com SLVS993 – OCTOBER 2009 The TPS658620 provides a recovery method to deal with timer fault conditions. The following summarizes this method: Condition 1: Charge voltage above recharge threshold (V(RCH)) and timeout fault occurs. Recovery The IC waits for the battery voltage to fall below the recharge threshold. This could method: happen as a result of a load on the battery, self-discharge or battery removal. Once the battery falls below the recharge threshold, the IC clears the fault and starts a new charge cycle. Condition 2: Charge voltage below recharge threshold (V(RCH)) and timeout fault occurs. Recovery Under this scenario, the IC connects an internal pull-up resistor from VIN_CHG pin to method: BAT pin. This pull-up resistor is used to detect a battery removal condition and remains on as long as the battery voltage stays below the recharge threshold. If the battery voltage goes above the recharge threshold, the IC disables the pull-up resistor connection and executes the recovery method described for condition 1. All timers will be reset and all timer fault conditions are cleared when a new charge cycle is started either via I2C (toggling bit CHGON in register CHG1) or by cycling the input power. All timers are reset and all timer fault conditions are cleared when the TPS658620 enters the UVLO mode or if the LDO mode is set. When the charger, thermal loop or DPPM loop are active the charge current is reduced. To avoid a false termination detection when those loops are active the charger logic doubles the period of the clock used by the charge safety timer. The clock frequency is divided by 2 when any of those loops are active and DTCON=1. The dynamic timer control may be disabled by setting control bit DTCON=0, at the CHG2 I2C register. An internal switch will discharge the BAT pin to ground when the battery is not detected. This switch is enabled via I2C control bit BATDCH on register CHG1. Charger status information is available at registers 0xB9, bits PACK_HOT, PACK_COLD, BATDET and BATCHGSWON; register 0xBA, bits TMRFLT, DPPM_ON, TH_ON, ITERM, STAT1 and STAT2 . See STATUS REGISTERS section for bit functional description. The charger status also is indicated at pin CHG_STAT , this pin can be used as a logic level output (2v2 level) or it can be connected to an external LED. Table 3-13. Charger Status Pin States 0xBA[2] 0xBA[1] CHARGER STATE CHG_STAT LEVEL (STAT1) (STAT2) 0 0 Pre-Charge HI 0 1 Charge Done LO 1 0 Fast Charge HI 1 1 Charge Suspend, Timer fault LO Submit Documentation Feedback DETAILED DESCRIPTION 45 |
Аналогичный номер детали - TPS658620ZQZT |
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Аналогичное описание - TPS658620ZQZT |
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