PT8A2707 Datasheet, PDF (3/26 Pages) Pericom Semiconductor Corporation – Charger Controller with Fuel-Guage & LCD/LED Display

PT8A2707-12/17-19
Charger Controller
with Fuel-Guage & LCD/LED Display
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Flow Chart
POWER UP ⁽¹⁾
STOP
CHARGE
PRE
CHARGE
> 55C
(8) ^{ 45C}
fast
chg ⁽⁵⁾
> 55C
(8)
 45C
FAST
CHARGE
> 55C ⁽⁸⁾
Full
Bat. ⁽⁶⁾
cord
off
cord
on/off
cord
off
motor
on/off
(2)(3)(4)
IDLE
motor
on/off
(2)(3)
motor
on/off
(2)(3)(4)
MOTOR
motor
on/off
(2)(3)(4)
FULL
CHARGE
cord on/off ⁽⁷⁾
motor
on/off
(2)(3)
Notes:
1) The system goes to idle when it is power-up. The system is waked up when cord is plugged, motor is turned on
or both.
2) Motor is turned on/off by tact switch or slide switch.
3) Motor will be turned off automatically when:
a) the voltage of the battery pack is lower than 1.8V or (adjustable externally);
b) the motor is drawing current more than the preset limit or (adjustable externally);
c) the battery pack temperature is higher than 55C (adjustable externally)
4) During charging when motor is turned on, the charging current is regulated at 1/10 of the fast-charging current.
When motor is turned off, the system will determine to go back to pre-charge/fast-charge/full-charge according
to the battery usage condition (more details could be obtained in the operation description).
5) Enter fast-charging when
a) battery temperature is less than 45C
b) battery voltage is higher than 2V or after pre-charging for 3 minutes
6) Enter full-charge state when one of the following full-charge criteria is reached:
a) safety timer timeout (4 external selections)
b) max. voltage 3.4V (adjustable externally)
c) -∆V
d) dT/dt (adjustable by component selections)
7) If the battery pack is previously fully-charged without any usage or self-discharged enough, the charger goes
directly to maintenance (trickle charge) when cord is plugged again.
8) Charger stops charging current when battery temperature is higher than 55C but resume for charging when
battery temperature falls below 45C
12-07-0005
PT0268-1 07/05/12
3