ACT81460
Rev 1.0, 18-Dec-2018
Tbattery < 0°C: All battery charging is suspended until the
temperature goes back above 0°C. Both the Fast
Charge Safety Timer and the Low Battery Safety Timers
are suspended.
Table 10 shows the resulting charge functionality and
safety timer settings. Figure 5 shows this in graphical
form.
0°C < Tbattery < 10°C: IPRE and ICHG Precharge and Fast
Charge currents in this region can be programmed to
either 50% or 100% of the fast charge current. Note that
ITRICKLE is not affected. Set I2C register 0xD0 bit 6 to 0
for the 100% setting and set to 1 for the 50% setting.
The termination voltage is not changed. The safety
timer runs at half speed. Table 10 shows the resulting
charge functionality and safety timer settings.
Charging Safety Timers
The ACT81460 provides two internal charging safety
timers: Precondition Safety Timer and Fast Charge
Safety Timer.
The Precondition Timer is 4000s. It is activated when
the charger is enabled and the battery voltage is less
than the precharge voltage, VPRE.
10°C < Tbattery < 45°C: Battery charging in this region
operates at normal voltage and current levels.
If the Precondition timer expires, the charger goes into
the Fault state charging stops.
45°C < Tbattery < 50°C: Battery charging is functional, but
limited in this region. Setting I2C register 0xD0 bit 6 to 1
disables all charging. Setting it to 0 does not affect
charge current, but reduces the termination voltage by
100mV from the normal termination voltage. The charge
timers are not affected when charging.
The Fast Charge Timer is 12000s. It is activated when
the battery voltage is above the precharge voltage,
VPRE.
If the Fast Charge Timer expires, the charger goes into
the Fault state charging stops.
Both safety timers are automatically stopped any time
the charging is enabled but charging is suspended.
This occurs when the battery temperature exceeds the
allowable temperature limits.
50°C < Tbattery < 60°C: Battery charging is functional, but
limited in this region. Setting I2C register 0xD0 bit 6 to 1
disables all charging. Setting it to 0 does not affect
charge current, but reduces the termination voltage by
150mV from the normal termination voltage. The charge
timers are not affected when charging.
Both safety timers run at ½ speed when VIN Input Reg-
ulation, IIN Current Regulation, or Die Thermal Regula-
tion are active. This feature allows more time to charge
without falsely triggering the fault timer.
Tbattery > 60°: All battery charging is suspended until the
temperature goes back below 60°C. Both the Fast
Charge Safety Timer and the Precondition Safety Tim-
ers are suspended.
Additionally, the Fast Charge Safety Timer runs at ½
speed in some JEITA charging modes. See the JEITA
Battery Temperature Control paragraph for more details.
Precondition
Battery
Safety Timer
Termination Volt-
age
I2C register
0xD0 bit 6
Fast Charge
Current
Fast Charge
Safety Timer
Temp
Trickle Charge
PreCharge
<0C
X
0
1
x
Suspended
100% of ICHG
50% of ICHG
100% of ICHG
100% of ICHG
Suspended
100% of ICHG
Suspended
Suspended
Stopped
Full Speed
½ Speed
Full Speed
Full Speed
Stopped
Suspended
100% of ITRICKLE
100% of ITRICKLE
100% of ITRICKLE
100% of ITRICKLE
Suspended
Suspended
100% of IPRE
50% of IPRE
100% of IPRE
100% of IPRE
Suspended
100% of IPRE
Suspended
Suspended
Stopped
Full Speed
½ Speed
Full Speed
Full Speed
Stopped
n/a
VTERM
0C to 10C
10C to 45C
45C to 50C
VTERM
VTERM
0
1
0
1
x
VTERM – 100mV
n/a
Full Speed
Stopped
100% of ITRICKLE
Suspended
Full Speed
Stopped
VTERM – 150mV
n/a
50C to 60C
> 60C
Stopped
Suspended
Stopped
n/a
Table 10: JEITA Mode Charging Safety Timer Configuration
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