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TPS658620ZQZT датащи(PDF) 45 Page - Texas Instruments

номер детали TPS658620ZQZT
подробное описание детали  Advanced Power Management Unit
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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
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DETAILED DESCRIPTION
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