Datasheet

OFF ANY STATE
BATTERY
SHORTED?
Timer frozen
Charging off
YES
PRECHARGESUSPEND TIMEOUT
FAST CHARGESUSPEND TIMEOUT
WAIT FOR
RECHARGE
CH_EN=0
CH_EN=0 ||
BATTEMP=1
CH_EN=1 &
BATTEMP=0
NO
V>V
LOWV
TERM=0
TERM=1 &
TERMI=1
TERM=0 ||
Battery removed
V
BAT
< V
RCH
&
Battery present
TEMP FAULT
TEMP FAULT
No FAULT
No FAULT
Timer frozen
Charging off
RESTART
RESTART
NOTES:
TEMP FUALT = Battery HOT|| Battery cold || Thermal shut-down
RESTART = V
USB
() || V
AC
() || Charger RESET bit() || V
BAT
< V
RCH
TPS65217A, TPS65217B, TPS65217C, TPS65217D
SLVSB64F –NOVEMBER 2011–REVISED APRIL 2013 www.ti.com
The fault status is indicated by CHTOUT and PCHTOUT bits in CHGCONFIG0 register. Timeout faults are
cleared and a new charge cycle is started when either USB or AC supplies are connected (rising edge of V
USB
or
V
AC
), the charger RESET bit is set to 1 in the CHGCONFIG1 register, or the battery voltage drops below the
recharge threshold V
RCH
.
Figure 11. State Diagram of Battery Charger
Battery Pack Temperature Monitoring
The TS pin of the TPS65217 connects to the NTC resistor in the battery pack. During charging, if the resistance
of the NTC indicates that the battery is operating outside the limits of safe operation, charging is suspended and
the safety timer value is frozen. When the battery pack temperature returns to a safe value, charging resumes
with the current timer setting.
By default, the device is setup to support a 10 kΩ the NTC with a B-value of 3480. The NTC is biased through a
7.35-kΩ internal resistor connected to the BYPASS rail (2.25 V) and requires an external 75-kΩ resistor parallel
to the NTC to linearize the temperature response curve.
TPS65217 supports two different temperature ranges for charging, 0°C to 45°C and 0°C to 60°C which can be
selected through the TRANGE bit in register CHCONFIG3.
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Product Folder Links: TPS65217A TPS65217B TPS65217C TPS65217D