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PT8A2707-12/17-19  
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Charger Controller with Fuel-Guage & LCD/LED Display  
Product Features  
2-3 cells, NiCd or NiMH battery fast-charger controller for battery-embedded devices  
Precise 7-bit fuel-gauge-counter measures charging and discharging current through battery pack. Make it possible  
to accurately indicate battery capacity through LCD (PT8A2707-09/2717-19) or LEDs (PT8A2710-12).  
Integrated with a DC/DC step-down controller make it possible for customers to manufacture just one  
PCB module that can:  
Cover different product models that requires different charging current/speed by changing only one resistor;  
Work with different kinds of AC/DC adapters with wide input voltage ranges.  
Motor also can work in both corded or cordless conditions. When motor is used in cord-mode, the  
charging current to battery is regulated at a maximum value of 1/10 of the fast-charging current. The  
battery is just like being slowly-charged and prevented from being exposed to a prolonged high-current  
charging profile.  
Provide excellent charge and discharge protections.  
Available with different parts to cover products employing slide switch (PT8A2707/10/17), tact switch  
(PT8A2708/09/11/12/18/19) input to control motor ON/OFF. Two-step motor-speed control (70%, 100%) is also  
available in PT8A2708/2711/2718.  
Very low standby current of typical 20A. Products could typically work in standby-mode for a few months,  
depends on battery capacity.  
Technology Highlights  
Employing 5 major charging states: cool-down / pre-charge / fast charge / trickle charge / stop charge, taking the  
best care for different battery conditions, especially for aged or dry batteries  
Excellent battery protection and full-charge detection schemes  
Negative delta voltage detection (-ΔV) with precision of +/-1mV step  
Maximum battery voltage detection to turn to maintenance  
Rate of change of temperature detection (dT/dt) best for NiMH batteries full-charge termination (use with  
NTC)  
Abnormal high battery temperature (55C) detection to stop charging (use with NTC)  
Flexible fast charge time-out setting (30mins/60mins/90mins/150mins)  
Fuel-gauge counter takes into account the battery self-discharge compensation based on time.  
Provide excellent battery over-discharge protection through auto-stop motor at once (<0.2s) when  
discharging current is higher than preset limit value for 3sec (3 limit values selectable externally)  
battery pack voltage is lower than No-Power value (adjustable externally)  
NTC measures battery pack temperature higher than preset high-temp value(adjustable externally)  
Key delay to reject multiple inputs at Tact switch (about 0.125s ignorance).  
Internal voltage regulator provides better rejection to interference.  
Integrated DC/DC step-down controller to regulate constant charging currents at different charging  
Available with 24-pin SOIC and SSOP lead-free package  
12-07-0005  
PT0268-1 07/05/12  
1
PT8A2707-12/17-19  
Charger Controller  
with Fuel-Guage & LCD/LED Display  
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Description  
The PT8A2707-12/2717-19 integrates charger controller and fuel-gauge into a single-chip. It detects full-charge  
through -V, dT/dt, safety-timer and maximum battery voltage, and learns the battery capacity from each  
charging/discharging cycle. Since PT8A2707-12/2717-19 measures charge/discharge current to account for the battery  
capacity in/out respectively, the battery capacity can be accurately recorded and displayed in 6-level  
(10%/20%/40%/60%/80%/100%) LED or LCD pattern. The continuous-learning capability enables the devices to take  
care of battery aging effect so that the capacity level is always accurately displayed throughout the life-span of the  
battery pack. In the charging control, a DC/DC controller is regulated to regulate constant currents for pre-charge, fast-  
charge and trickle-charge conditions. The charging current is determined by the value of a current-sense resistor such  
that it is tunable upon different applications requirements. When motor is turned on during charging, the charge  
current to battery pack is regulated at 1/10 of the fast-charge current so that motor can draw current from the adapter  
while battery is charged in a safe and under-controlled condition. The PT8A2707-12/2717-19 employs NTC as the  
means to measure the battery pack temperature. When a high temperature is measured during charging, the charging  
current will be cut off. The devices also detect NTC short/open at which all activities will be disabled if any one of  
these conditions is observed.  
Function comparison table  
TACT  
Switch  
(ON/OFF)  
SLIDE  
Switch  
(ON/OFF)  
DSTACT Switch  
(ON(70%)/100%  
/OFF)  
Motor  
Speed (70%  
PWM)  
LCD/LED  
display in  
idle mode  
Family  
members  
LCD  
LED  
PT8A2707  
PT8A2708  
PT8A2709  
PT8A2710  
PT8A2711  
PT8A2712  
PT8A2717  
PT8A2718  
PT8A2719  
12-07-0005  
PT0268-1 07/05/12  
2
PT8A2707-12/17-19  
Charger Controller  
with Fuel-Guage & LCD/LED Display  
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Flow Chart  
POWER UP (1)  
cord  
off  
cord  
on/off  
PRE  
IDLE  
CHARGE  
cord  
off  
> 55C  
motor  
fast  
motor  
chg (5)  
on/off  
on/off  
45C  
(2)(3)  
(2)(3)(4)  
(8)  
motor  
on/off  
> 55C  
FAST  
CHARGE  
STOP  
CHARGE  
(2)(3)(4)  
MOTOR  
(8)  
45C  
motor  
on/off  
(8)  
> 55C  
(2)(3)(4)  
Full  
Bat. (6)  
cord on/off (7)  
FULL  
CHARGE  
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 55C (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 45C  
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 55C but resume for charging when  
battery temperature falls below 45C  
12-07-0005  
PT0268-1 07/05/12  
3
PT8A2707-12/17-19  
Charger Controller  
with Fuel-Guage & LCD/LED Display  
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Pin Assignment and Description  
CHARGE  
1
CHARGE  
CORD  
TEST  
BP  
1
CHARGE  
CORD  
TEST  
BP  
1
VMSTOP  
ISENDC  
VMSTOP  
ISENDC  
VMSTOP  
ISENDC  
24  
23  
24  
23  
24  
23  
2
3
4
2
3
4
2
3
4
CORD  
TEST  
BP  
22 ISENFG  
22 ISENFG  
22 ISENFG  
21 ISENCOM  
21 ISENCOM  
21 ISENCOM  
5
6
5
6
5
6
L100  
L80  
L100  
L80  
L100  
L80  
20 CC  
20 CC  
20 CC  
VDD  
VDD  
VDD  
19  
19  
19  
7
8
7
8
7
8
L60  
L60  
L60  
18 TIMER  
17 VEE  
18 TIMER  
18 TIMER  
L40  
L20  
BLI  
L40  
L20  
BLI  
17  
16  
L40  
L20  
BLI  
17  
16  
VEE  
VT  
VEE  
VT  
16  
9
9
9
VT  
10  
15 VBLOW  
14 VB  
10  
15 VBLOW  
14 VB  
10  
15 VBLOW  
14 VB  
GND  
GND 11  
12  
GND 11  
12  
11  
12  
MOTOR  
13  
MOTOR  
13  
MOTOR  
13  
TACT  
SLIDE  
DSTACT  
PT8A2707/17 pins assignment  
PT8A2708/18 pins assignment  
PT8A2709/19 pins assignment  
Table 1: PT8A2707-2709 and PT8A2717-2719 LCD Pattern Pin Description  
PIN  
1
2
3
4
5
6
7
8
I/O  
O
I
Name  
CHARGE  
CORD  
TEST  
BP  
L100  
L80  
L60  
L40  
Descriptions  
PWM DC/DC controller output for constant current regulation  
External DC supply existence detection  
Quick test mode  
I
O
O
O
O
O
O
O
-
BP for LCD back plane driver  
Fuel gauge output (Remaining 100% capacity, full charge indication)  
Fuel gauge output (Remaining 80% capacity)  
Fuel gauge output (Remaining 60% capacity)  
Fuel gauge output (Remaining 40% capacity)  
Fuel gauge output (Remaining 20% capacity)  
Battery-low output (Remaining <10% capacity)  
Ground  
9
L20  
BLI  
GND  
10  
11  
12  
I/O  
MOTOR  
SLIDE  
DSTACT  
TACT  
VB  
VBLOW  
VT  
VEE  
TIMER  
VDD  
CC  
ISENCOM  
ISENFG  
ISENDC  
Motor driver control  
Slide switch (PT8A2707/17) input to control motor running  
Tact switch (PT8A2708/18) input to control motor running with dual speeds  
Tact switch (PT8A2709/19) input to control motor running  
Charging battery voltage sense input  
Low-battery voltage sense input  
Temperature sensor (NTC) input  
Regulated output voltage  
Charging protection timer  
Supply voltage  
13  
I
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
I
I
I
O
O
-
I/O  
I
Compensation capacitor for DC/DC converter  
Current sense reference plane  
Fuel gauge current sense input  
I
I
DC/DC controller current sense input  
Pin Config  
GND  
0.6-1.0V  
VDD  
Current Limit  
4.2x charging current  
5x charging current  
3x charging current  
Motor stop current limit value  
select input  
24  
I
VMSTOP  
12-07-0005  
PT0268-1 07/05/12  
4
PT8A2707-12/17-19  
Charger Controller  
with Fuel-Guage & LCD/LED Display  
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1
2
1
2
1
2
CHARGE  
CORD  
TEST  
L100  
L80  
CHARGE  
CORD  
TEST  
L100  
L80  
CHARGE  
CORD  
TEST  
L100  
L80  
VMSTOP  
ISENDC  
VMSTOP  
ISENDC  
VMSTOP  
ISENDC  
24  
23  
24  
23  
24  
23  
3
4
3
4
3
4
22 ISENFG  
22 ISENFG  
22 ISENFG  
ISENCOM  
ISENCOM  
ISENCOM  
21  
20  
19  
21  
20  
19  
21  
20  
19  
5
6
5
6
5
6
CC  
CC  
CC  
VDD  
VDD  
VDD  
L60  
L60  
L60  
7
8
7
8
7
8
L40  
L40  
L40  
18 TIMER  
17 VEE  
18 TIMER  
17 VEE  
18 TIMER  
17 VEE  
L20  
NA  
BLI  
L20  
LTURBO  
BLI  
L20  
NA  
BLI  
9
16  
9
16  
9
16  
VT  
VT  
VT  
10  
15 VBLOW  
14 VB  
10  
15 VBLOW  
14 VB  
10  
15 VBLOW  
14 VB  
GND  
GND  
GND  
11  
12  
11  
12  
11  
12  
MOTOR  
13  
MOTOR  
13  
MOTOR  
13  
TACT  
SLIDE  
DSTACT  
PT8A2710 pins assignment  
PT8A2711 pins assignment  
PT8A2712 pins assignment  
Table 2: PT8A2710-2712 LED Pattern Pin Description  
Descriptions  
PIN  
1
2
3
4
5
6
7
8
I/O  
O
I
Name  
CHARGE  
CORD  
TEST  
L100  
PWM DC/DC controller output for constant current regulation  
External DC supply existence detection  
Quick test mode  
Fuel gauge output (Remaining 100% capacity, full charge indication)  
Fuel gauge output (Remaining 80% capacity)  
Fuel gauge output (Remaining 60% capacity)  
Fuel gauge output (Remaining 40% capacity)  
Fuel gauge output (Remaining 20% capacity)  
NA for PT8A2710/12  
I
O
O
O
O
O
O
L80  
L60  
L40  
L20  
9
NA  
LTURBO  
BLI  
GND  
MOTOR  
SLIDE  
DSTACT  
TACT  
VB  
VBLOW  
VT  
VEE  
TIMER  
VDD  
CC  
Motor “Turbo-Mode” Indicator (PT8A2711)[Normal speed, OFF]  
Battery-low output (Remaining <10% capacity)  
Ground  
10  
11  
12  
O
-
I/O  
Motor driver control  
Slide switch (PT8A2710) input to control motor running  
Tact switch (PT8A2711) input to control motor running with dual speeds  
Tact switch (PT8A2712) input to control motor running  
Charging battery voltage sense input  
Low-battery voltage sense input  
Temperature sensor (NTC) input  
Regulated output voltage  
Charging protection timer (1hr/1.5hrs/2.5hrs/4hrs)  
Supply voltage  
Compensation capacitor for DC/DC converter  
Current sense reference plane  
Fuel gauge current sense input  
13  
I
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
I
I
I
O
O
-
I/O  
I
ISENCOM  
ISENFG  
ISENDC  
I
I
DC/DC controller current sense input  
Pin Config  
GND  
0.6-1.0V  
VDD  
Current Limit  
4.2x charging current  
5x charging current  
3x charging current  
Motor stop current limit value  
select input  
24  
I
VMSTOP  
12-07-0005  
PT0268-1 07/05/12  
5
PT8A2707-12/17-19  
Charger Controller  
with Fuel-Guage & LCD/LED Display  
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Function description (refer to Flow Chart)  
1.  
Battery Voltage Definitions:  
Table 3: Battery Voltage Definition  
Suggested Value  
Item  
General Setting  
0.9V-1.0V/cell  
Remark  
No-Power value  
Battery-Low value  
Max VB  
1.8-2V for 2cells battery pack  
2.0-2.2V for 2cells battery pack  
3.3-3.4V for 2cells battery pack  
Adjustable externally,  
please refer to  
„application instruction‟  
1.0V-1.1V/cell  
1.65V-1.7V/cell  
2.  
Charging Mechanism (cord is connected but motor is off)  
When a cord is detected, pre-charge begins. If the battery voltage is higher than Battery-Low threshold (usually set between  
0.95V-1.1V/cell) and the battery pack temperature is less than 45C, fast-charge starts. Otherwise, the battery will be kept in  
pre-charge status until its voltage is higher than the preset Battery-Low value or a 3 minutes time-out is reached to enter fast-  
charge mode. If battery temperature is found increasing to 55C during pre-charge state, battery charging is stopped (DC/DC  
cuts power) to enter cool down state. Nevertheless, pre-charge will continue in any case until the battery temperature is  
cooled down below 45C.  
When entering fast-charge mode, if the battery voltage is below a preset voltage level (usually set at about 1.3V-1.4V/cell,  
measured with charging current), a start-up timer is effective to avoid false triggering of -ΔV and dT/dt to have early fast-  
charge termination. During the start-up time, -ΔV and dT/dt detections are ignored but maximum temperature of 55C will  
always be observed to stop fast-charge. The start-up timer is dependent to the external fast-charge timer setting as tabled  
below. The dT/dt data is valid for battery temperature in range of 35C to 55C.  
Table 4: Start-up Time  
Timer  
Tmax (User programmable externally)  
Start-up timer for inhibiting  
negative V and dT/dt  
measurement  
tmax/20  
tmax (min)  
Start-up time (s)  
30  
60  
90  
90  
180  
270  
450  
150  
Fast charge mode is terminated when any one of the following conditions meet:  
1) Minus-delta-V Detection (-V): The battery pack voltage is sampled by high precision A/D converter every 10s, with 0.5s  
sampling time. For each sampling interval (0.5s), the charging current is cut down. Averaging is performed on the collected  
data and the result is stored into registers after passing through high-order digital filter. The minus-delta-V is qualified when a  
voltage drop of about 5mV/cell from the maximum voltage recorded. The second minus-delta-V is qualified when a voltage  
drop of about 5mV/cell after the first minus-delta-V has been qualified. Every minus-delta-V happened, fuel-gauge increased  
one level up, and so and so until fuel-gauge is full.  
Table 5: Sample Description  
VB > 2.6V (measured by sampling)  
10s  
0.5s (fast-charging inhibition)  
Bypass Start-up timer  
VB sampling period (tp)  
VB sampling time  
10s (time-multiplexing with VB sampling)  
BT sampling period (tp)  
tp=0.5s  
VB measurement  
BT measurement  
2) Maximum Battery Voltage Detection: When the averaged battery pack voltage reaches a preset maximum voltage limit  
(usually set about 1.6V-1.7V/cell) during the charging interval, fast-charge in terminated.  
3) Battery Temperature Detection (Max. Temp and dT/dt): The PT8A2707-12/2717-19 employs thermistor(NTC) as battery  
temperature sensor. When the battery temperature reaches 55C, fast-charge is terminated and the battery will then go to cool  
down mode; or the rate of temperature change (dT/dt) reaches preset value, fast-charge is terminated and the battery will then  
be under trickle-charge mode at a rate of 1/10 of the fast-charge current. If NTC is not employed, the pin “VT” should be  
biased at an equivalent voltage as for 10C-20C or else the PT8A2707-12/2717-19 determines the NTC is opened and will  
stop all charging activity forever.  
12-07-0005  
PT0268-1 07/05/12  
6
PT8A2707-12/17-19  
Charger Controller  
with Fuel-Guage & LCD/LED Display  
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4) Fast-Charge Timer Cut-Off: The PT8A2707-12/2717-19 comes with 4 timer settings (30mins/60mins/90mins /150mins)  
selectable externally through resistor divider. The fast-charge timer works as the last protection to prevent over-charging the  
battery if none of the above 3 terminations takes effect. In general, the timer is chosen according to the required time to fully-  
charge an empty battery with about 20-30% margins. The timer can be easily calculated at a given charging current and  
battery capacity.  
5) NTC Open or Short  
During battery charging, the PT8A2707-12/2717-19 always detects NTC status by measure VT voltage value. If NTC  
open/short is detected, all charging activities will be stopped and go to stop-charging mode.  
After fast-charge, the battery is charged at a rate of 1/10C to compensate for the self-discharge rate so as to maintain the battery  
capacity always at full as long as the cord is still connected. If the battery temperature continues to rise to 55C during  
maintenance, the PT8A2707-12/2717-19 will cut-off the charge current until the battery temperature reduces to below 55C to  
resume.  
After full-charge is detected, the PT8A2707-12/2717-19 will restore the full-charge status until it measures its capacity drops 5%  
of charge due to self-discharge (cord was removed) of battery or motor is turned on. During the time the PT8A2707-12/2717-19  
keeps the full-charge status internally, if user detaches motor and plugs-in cord to charge the shaver again, the PT8A2707-  
12/2717-19 will go to trickle-charge mode.  
3.  
Discharging Mechanism (Motor is On while Cord is Not Connected)  
SLIDE, TACT and DSTACT are motor running control switch inputs.  
1) SLIDE Switch Mode: PT8A2707/17/10 uses a pull high slide switch to control motor running through SLIDE pin. When  
slide switch is closed, the SLIDE pin is pulled high, and the motor is always turned on at 100% speed (full speed), else if  
slide switch is open, the motor is always turned off to stop motor running.  
2) TACT Switch Mode: PT8A2709/19/12 uses a pull high tact switch to control motor running through TACT pin. With 1st  
pressing of TACT switch, the motor is always turned on at 100% speed (full speed), and with 2nd pressing of TACT switch,  
the motor is always turned off to stop motor running. When using TACT switch mode, the key delay for tact switches to  
reject multiple inputs are typically about 0.125s.  
3) DSTACT Switch Mode: PT8A2708/18/11 uses a pull high tact switch to control motor running with Dual Speed through  
DSTACT pin. With 1st pressing tact switch, the motor is turned on at 70% speed, with 2nd pressing of tact switch, the motor is  
turned to 100% speed (full speed), and motor is turn off to stop running with 3rd pressing of tact switch. When using  
DSTACT switch mode, the key delay for tact switches to reject multiple inputs are typically about 0.125s.  
In above 3 models, battery over-discharge protection is available through auto-stop motor at once (<0.2s) when  
Battery discharging current is higher than preset current limit for 3sec (there are three limit values selectable refer to „motor-  
over-current protection settings‟)  
Battery pack voltage is lower than the preset No-Power limit value (typically about 0.9-1.0V per cell).  
NTC measures battery pack temperature higher than the preset limit (usually about 55-60C)  
The motor can be resumed when any of the above criteria is cleared. But for SLIDE switch model, user needs to turn off and turn  
on SLIDE switch to start motor again; for TACT and DSTACT switch models, the user needs to press the tact switch once to start  
motor.  
4) Battery Low Alarm: The PT8A2707-12/2717-19 detects battery capacity through output voltage level by VBLOW pin.  
When battery voltage is down to Battery-Low value (battery capacity is below 10%), Battery-Low alarm is alert, and controls  
Battery-Low LCD screen or LED (which is connected to BLI pin10) to remind user that battery is under low capacity  
condition. If battery voltage continues go down and decreases to No-Power value, the motor will self shut down to protect  
battery be over discharged.  
The Battery-Low LCD segment and LED indications as below table.  
Table 6: Battery Alarm Conditions  
Item  
Condition  
Motor on  
Motor off  
Motor on  
Motor off  
Battery-Low LED  
on  
Battery-Low LCD  
on  
on  
No cord  
blinking 5s  
on  
on  
Cord is on  
4.  
Cord is Connected While Motor is On  
When cord is connected while motor is on, or vice versa, there are two scenarios:  
1) The motor is turned on and draws more current than the AC/DC adapter can supply: In all cases, the PT8A2707-  
12/2717-19 will enable the external PMOSFET to fully turn on to supply maximum current to the motor. There are three sub-  
cases to observe:  
12-07-0005  
PT0268-1 07/05/12  
7
PT8A2707-12/17-19  
Charger Controller  
with Fuel-Guage & LCD/LED Display  
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||  
a) If the motor is turned on during the pre-charge state, obviously there is no charging current to battery. The PT8A2707-  
12/2717-19 will return to discharging mode while fuel-gauge is continuing to count the discharge amount. The  
discharging is stopped at the same criteria described in the Discharging Mechanism section.  
b) If the motor is turned on during the fast-charge state, the fast-charge safety timer is held. If the motor is turned on less  
than 5% of the battery maximum capacity, fast-charge resumes with fast-charge timer continue to count (but start-up  
timer starts from beginning). However, when the motor is accumulatively turned on over 5% of the battery maximum  
capacity while cord is still connected, the fast-charge timer is cleared and the battery pack will be recharged from pre-  
charge state again once motor is off.  
c) If the motor is turned on during the trickle-charge state, if the motor is turned on to accumulatively consume less than  
5% (not necessarily in single operation) of the battery maximum capacity, the PT8A2707-12/2717-19 resumes trickle-  
charge state. However, when the motor is turned on over 5% of the battery maximum capacity during the trickle-charge  
state, the battery pack will be recharged from pre-charge state again after motor is off.  
Besides, at any time when the battery pack voltage is lower than the No-Power value or discharging current is higher than the  
preset limit levels for 3sec, the motor will be stopped and the devices return to charging status.  
2) The motor is turned on but draws less current than the AC/DC adapter can supply: In all cases, when the battery is not  
discharged, the PT8A2707-12/2717-19 regulates a charging current of 1/10 of the fast-charge current to battery pack. In this  
case, the battery pack is under slow charging. Similarly, there are three more situations to observe:  
a) If the motor is turned on during the pre-charge state, once motor is turned off, the PT8A2707-12/2717-19 will resume  
back to the pre-charge state.  
b) If the motor is turned on during the fast-charge state, the fast-charge timer is held until motor is turned off to resume  
fast-charging.  
c) If the motor is turned on during the trikle-charge state, once motor is turned off, the PT8A2707-12/2717-19 will resume  
back to the maintenance state.  
In any charging states, if the battery temperature is measured higher than 55C, the motor is stopped and the 0.1C charging current  
is cut off. The LED/LCD still displays as in “Charging Mode”. The motor will draw current from battery pack until the battery  
temperature is below 55C to resume 0.1C charging current. However, no matter whether it is in fast-charging or trickle-charging  
modes, when the motor is turned on to consume over 5% (accumulatively, not necessarily in single operation) of the battery  
maximum capacity during battery is over-temperature, the battery pack will be recharged from pre-charge state again after motor  
is off.  
5.  
Fuel-Gauge Counter  
1) Charge Counting: Charge activity is detected based on positive voltage difference (VFUEL) between the pins ISENFG and  
ISENCOM. When voltage of ISENFG is higher than the voltage of ISENCOM, the PT8A2707-12/2717-19 increments its  
fuel-gauge counter at a rate proportional to VFUEL. VFUEL is sampled and converted into digital data through high-  
precision A/D converter. When the fuel-gauge counter accumulates up to 99% level but none of the full-charge criteria (-V,  
dT/dt, safety timer, maximum battery voltage) is detected, the fuel-gauge will wait at 99% level. Right after the battery is  
fully-charged, the PT8A2707-12/2717-19 displays full-charge and learns the capacity of the battery pack such that the display  
will be more and more accurate in both charging and discharging cycles later.  
2) Discharge Counting: Discharge activity is detected based on a negative voltage difference (VFUEL) between the pins  
ISENFG and ISENCOM. When voltage of ISENFG is lower than the voltage of ISENCOM, the PT8A2707-12/2717-19  
decrements its fuel-gauge counter at a rate proportional to VFUEL. VFUEL is sampled and converted into digital data  
through high-precision A/D converter. In case the fuel-gauge counter rolls to zero count while the battery voltage is still  
higher than the preset No-Power level, the Battery-Low LED is still flashing while user can still use motor. Motor will be  
stopped when battery voltage is below the No-Power level. The maximum fuel value is not updated, but will be updated when  
necessary for next time the battery is fully charged. The fuel value will be adjusted to 10% if the battery voltage gradually  
falls below Battery-Low threshold.  
6.  
Idle Mode  
1) Standby: When cord is not connected and motor is off, the PT8A2707-12/2717-19 turn to idle state to save power. Some  
internal circuits are shut-down to keep the standby power at about 20A.  
2) Background Offset Cancellation: when the PT8A2707-12/2717-19 is waked up by user, an offset cancellation is performed  
for the internal precise A/D converter before entering cord or motor modes. It normally takes 0.2~0.3s. The PT8A2707-  
12/2717-19 returns to idle state after use.  
12-07-0005  
PT0268-1 07/05/12  
8
PT8A2707-12/17-19  
Charger Controller  
with Fuel-Guage & LCD/LED Display  
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||  
7.  
First-Time Power-Up  
Initial Fuel Count & First-Time Charging: Upon power-up, the PT8A2707-12/2717-19 resets for all internal memory and  
resumes all default settings, the fuel-gauge counter will be initialized as zero count. The initialization may take a few seconds  
before PT8A2707-12/2717-19 boots up to operate normally.  
For the first-time charging, the fuel-gauge counter counts up to a default internal maximum fuel value (which is determined by the  
fast-charge timer selected externally. E.g. a 90mins timer means roughly it is a 1-hour charger, the initial maximum fuel value is  
assumed for 1hr for 1C charging current. Similarly, a 150min timer is assumed for a 120mins for 0.5C charging current, etc.)  
measured by the external current sense resistor. Fuel-gauge LCD segments or LEDs are light up according to the initial maximum  
fuel value. The 100% fuel LCD segment (or LED) keeps on flashing even though the fuel-gauge count reaches the default  
maximum value. In this moment, the fuel-gauge counter learns the battery capacity by continuing to roll up its counter until fast-  
charging is completed. This new battery capacity is therefore memorized and used as the maximum value for next charging cycles.  
Similarly, if full-charge is detected earlier than the counter reaches its initial maximum fuel value, the maximum fuel value is  
updated but progressively.  
8.  
Fuel-Gauge Display  
The PT8A2707/08/09/17/18/19 use LCD screen for the fuel gauge display and PT8A2710/11/ 12 use LEDs for fuel gauge display.  
For both LCD screen and LED models, there are 3 different display modes: Charging Mode, Discharging Mode and Idle Mode,  
as described in LED/LCD pattern section in pages 12-13.  
1) Charging Mode:  
a) Cord Mode with Motor off: When cord is connected, the fuel gauge display is turned on to “Charging Mode”. As soon as  
cord is removed, the fuel-gauge LED display continues to display the fuel gauge level according to the “Discharging Mode”  
for 5s.  
b) Motor-On Mode with Cord: When motor is turned on while cord is plugged in, or vice versa, the PT8A2707-12/2717-19  
displays fuel-gauge with accordance to the actual charge or discharge amount. The fuel-gauge always displays in the  
“Charging Mode” no matter whether there is net current charging into the battery or not. If the motor is drawing less current  
than the adapter can supply, the DC/DC converter will regulate the battery charging current at a slow-rate (1/10 of the fast  
charge current). The high-precision ADC in PT8A2707-12/2717-19 is still to calculate this small charging current to add into  
the fuel-gauge counter.  
2) Discharging Mode:  
a) Motor-On Mode without Cord: When motor is turned on while no cord is connected, the fuel gauge is displayed continuously  
in the “Discharging Mode”. After motor is turned off, the fuel-gauge display will still continue to display for 5 seconds.  
b) Motor-On Mode with Cord: The fuel-gauge always displays in the "Charging Mode" no matter whether there is net current  
charging into the battery or not. If the motor is drawing more current than the adapter can supply, there will be some amount  
of current being drawn from the battery pack. The high-precision ADC in PT8A2707-12/2717-19 is still capable to calculate  
this small discharging current to subtract from the fuel-gauge counter.  
3) Idle Mode:  
LED display will be OFF in idle state. For LCD mode, the display of PT8A2707/08/ 09 will be continued on until battery has no  
power; but the display of PT8A2717/18/19 will be off.  
12-07-0005  
PT0268-1 07/05/12  
9
PT8A2707-12/17-19  
Charger Controller  
with Fuel-Guage & LCD/LED Display  
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||  
LCD output specification  
Table 7: LCD Specifications  
Pin  
BP  
Signal Format  
64Hz 50% Duty Cycle Square-wave Output Signal Generated from the 32kHz Master Clock  
OFF: In-phase with Back Plane Signal  
L100, L80, L60,  
L40  
ON: 180Out-of-phase with Back Plane Signal  
2Hz-FLASH: Blinking at 2Hz During Charging Mode. Switch between In-phase and Out-of-Phase Output  
Signal at 2Hz  
OFF: In-phase with Back Plane Signal  
ON: 180Out-of-phase with Back Plane Signal  
2Hz-FLASH: Blinking at 2Hz During Charging Mode. Switch between In-phase and Out-of-Phase Output  
Signal at 2Hz  
1Hz-FLASH: Blinking at 1Hz During Discharging Mode. Switch between In-phase and Out-of-Phase  
Output Signal at 1Hz  
OFF: In-phase with Back Plane Signal  
ON: 180Out-of-phase with Back Plane Signal  
L20  
BLI  
Figure 1: LCD Signal Phase vs BP Signal Phase for all states  
BP  
SIGNAL  
ON  
OFF  
FLASH  
12-07-0005  
PT0268-1 07/05/12  
10  
PT8A2707-12/17-19  
Charger Controller  
with Fuel-Guage & LCD/LED Display  
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||  
LED/LCD Patterns Summary  
LCD and LED Display Indication  
LCD is ON  
LCD is ON, blinking at 2 Hz during charging  
Blinking at 1Hz during discharging  
BLI  
Percentage of Battery Charge  
0-10  
11-20  
21-40  
41-60  
61-80  
81-98  
100  
100  
80  
100  
80  
80  
60  
60  
60  
60  
40  
Charge mode  
40  
40  
40  
40  
20  
20  
20  
20  
20  
20  
20  
BLI  
BLI  
BLI  
BLI  
BLI  
BLI  
BLI  
100-98  
98-81  
80-61  
60-41  
40-21  
20-11  
10-0  
Percentage of Battery Charge  
100  
80  
100  
80  
80  
60  
40  
20  
60  
60  
60  
40  
20  
Discharge mode  
40  
40  
40  
20  
20  
20  
20  
BLI  
LCD monitor display  
LED is OFF  
LED is ON  
LED is flashing at 2 Hz  
11-20 21-40  
(100) (100)  
Percentage of battery charge  
0-10  
41-60  
61-80  
(100)  
81-98  
(100)  
99-100  
(100)  
(100)  
(100)  
(80)  
(60)  
(40)  
(20)  
(BLI)  
(80)  
(60)  
(40)  
(20)  
(BLI)  
(80)  
(60)  
(40)  
(20)  
(BLI)  
(80)  
(60)  
(40)  
(20)  
(BLI)  
(80)  
(60)  
(40)  
(20)  
(BLI)  
(80)  
(60)  
(40)  
(20)  
(BLI)  
(80)  
(60)  
(40)  
(20)  
(BLI)  
Charge mode  
100-99  
98-81  
80-61  
60-41  
40-21  
20-11  
10-0  
Percentage of battery charge  
(100)  
(80)  
(60)  
(40)  
(20)  
(BLI)  
(100)  
(80)  
(60)  
(40)  
(20)  
(BLI)  
(100)  
(80)  
(60)  
(40)  
(20)  
(BLI)  
(100)  
(80)  
(60)  
(40)  
(20)  
(BLI)  
(100)  
(80)  
(60)  
(40)  
(20)  
(BLI)  
(100)  
(80)  
(60)  
(40)  
(20)  
(BLI)  
(100)  
(80)  
(60)  
(40)  
(20)  
(BLI)  
Discharge mode  
LED monitor display  
Figure 2: LCD and LED Display  
12-07-0005  
PT0268-1 07/05/12  
11  
PT8A2707-12/17-19  
Charger Controller  
with Fuel-Guage & LCD/LED Display  
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||  
Test Mode Specification  
Test pin = 1.65V (or short to VDD), VDD=2.4V, ISENDC = 2.4V, ISENFG = 2.4V, ISENCOM = 2.4V, BP = 0V  
VT = 0.75V (25oC)  
Table 8: for Test Mode  
INPUT  
State Timer VT  
Explanation  
Output  
charge BLI L100  
Duration  
62.5msec  
motor  
For tester test  
0
1
2
3
0V  
0V  
0V  
0.75V 62.5msec (Isendc-Isencom) regulate 7mV  
0.75V 62.5msec (Isendc-Isencom) regulate 70mV  
0.75V 62.5msec All LEDs turn on  
1
1
0
1
1
0
1
1
0
0
0
0
50% PWM  
@ 100Hz  
4
5
0V  
0.75V 62.5msec MOTOR outputs 100Hz 50% duty cycle  
0
1
1
BLI turns on if NTC short or open;  
0.75V 62.5msec  
0V  
0V  
0
0
1
1
0
1
0
0
otherwise L100 turns on  
6
7
0
1
2
3
0.75V 62.5msec L100, BLI output refer to timer setting  
62.5msec  
1sec  
1sec  
1sec  
1sec  
For manual test  
0V  
0V  
0V  
0.75V  
0.75V  
0.75V  
(Isendc-Isencom) regulate 7mV  
(Isendc-Isencom) regulate 70mV  
All LEDs turn on  
1
1
0
1
1
0
1
1
0
0
0
0
50% PWM  
@ 100Hz  
4
5
0V  
0.75V  
1sec  
1sec  
MOTOR outputs 100Hz 50% duty cycle  
0
1
1
BLI turns on if NTC short or open;  
otherwise L100 turns on  
L100, BLI output refer to timer setting  
0V  
0V  
0.75V  
0.75V  
0
0
1
1
0
1
0
0
6
7
1sec  
1sec  
12-07-0005  
PT0268-1 07/05/12  
12  
PT8A2707-12/17-19  
Charger Controller  
with Fuel-Guage & LCD/LED Display  
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||  
Maximum Ratings  
Note:  
o
o
Stresses greater than those listed under MAXIMUM  
RATINGS may cause permanent damage to the  
device. This is a stress rating only and functional  
operation of the device at these or any other condi-  
tions above those indicated in the operational sec-  
tions of this specification is not implied. Exposure  
to absolute maximum rating conditions for extended  
periods may affect reliability.  
StorageTemperature...................................................................................-40 Cto+125 C  
SupplyVoltagetoGroundPotential(Input&VCC Only).......................-0.5Vto+6.0V  
SupplyVoltagetoGroundPotential(Outputs&D/OOnly)................-0.5Vto+6.0V  
DCInputVoltage ............................................................................................-0.5Vto+6.0V  
PowerDissipation.........................................................................................................500mW  
Recommendedoperationconditions  
Symbol  
Description  
Min  
Type  
Max  
Unit  
VCC  
VIH  
VIL  
TA  
Operating Voltage  
“H” Input Voltage  
“L” Input Voltage  
1.8  
0.7VCC  
-
3.0  
-
5.5  
-
V
V
0.3VCC  
70  
V
-
Operating temperature  
-10  
25  
°C  
Electrical Characteristics  
(Unless otherwise noted, TA = -10~70°C, VCC=3.0V)  
Symbol  
Parameter  
Test Conditions  
Min  
Typ  
Max Unit  
VEE  
VEE  
VLDR  
VIL  
VIH  
IIH  
Regulator Output Voltage  
Line regulation  
VEE Load regulation  
IOUT = 1mA  
1.8VCC5.5V, No load  
1.6  
-
-
1.65  
1.7  
50  
10  
0.90  
-
100  
-1  
1
V
mV  
mV  
V
40  
3
-
-
30  
-
-
0
-
-
-
0mA IL1mA  
Input Low Threshold for all digital input  
Input High Threshold for all digital input  
-
-
-
-
-
-
-
-
-
-
2.1  
20  
-
-1  
-
0.36  
1.19  
1.70  
V
Input leakage current for SLIDE TACT and Turbo  
pins  
A  
A  
IIL  
IADC  
ADC Input Current (VB, VT)  
90mins  
0.165  
0.46  
1.29  
Fast-Charge Timer Input  
voltage Range  
60mins  
30mins  
150mins  
CTMAX  
V
Internal  
reference for  
Pre-charge mode and trickle  
charge mode (1/10CC)  
-
4
7
9
VCHARGE DC-DC output  
current  
Fast charge mode (1CC)  
-
50  
70  
90  
mV  
VVMSTOP= GND  
VVMSTOP=0.6-1.0V  
VVMSTOP= VCC  
-240  
-280  
-168  
-300  
-350  
-210  
-360  
-420  
-252  
VDISMAX  
Internal reference for discharging protection  
Duty cycle of Motor driver  
output for controlling motor  
speed  
Motor frequency for TE trimming  
PWM signal frequency for motor driver  
output  
TACT and DSTACT tact switches delay time  
to active  
High speed  
Low speed  
-
-
-
-
100%  
80%  
100  
-
DMOTOR  
-
78%  
90  
82%  
110  
FT  
Hz  
Hz  
FMOTOR  
-
-
90  
-
100  
125  
140  
150  
tDLY  
IOL1  
ms  
Output Sink Current  
(L100, L80, L60, L40, L20, BLI or LMON or  
LTURBO)  
VCC =2.4V ,VOL1=0.4V  
6
8
-
mA  
To be continued.  
12-07-0005  
PT0268-1 07/05/12  
13  
PT8A2707-12/17-19  
Charger Controller  
with Fuel-Guage & LCD/LED Display  
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||  
Continued.  
Symbol  
Parameter  
Test Conditions  
VCC =1.8V , VOH2=1.2V  
VCC =3.0V , VOH2=1.2V  
VCC =3.0V ,VOL2=0.3V  
VCC =2.4V , VOH3=1.2V  
VCC =3.0V , VOH2=1.2V  
VCC =3.0V ,VOL3=0.3V  
VCC =3.0V , VOH4=2.7V  
VCC =3.0V ,VOL4=0.3V  
VCC=3.0V, VOH5=2.7V  
VCC=3.0V, VOL5=0.3V  
VCC=3.0V  
Min  
-10  
-13  
0.5  
-5  
Typ  
-13  
-18  
2.5  
-10  
-15  
4
Max  
Unit  
mA  
mA  
mA  
IOH2  
Output Source Current (MOTOR)  
Output Sink Current (MOTOR)  
Output Source Current (CHARGE)  
IOL2  
-
-
IOH3  
-5  
IOL3  
IOH4  
IOL4  
IOH5  
IOL5  
ICCQ  
IS  
Output Sink Current (CHARGE)  
Output Source Current (CC pin)  
Output Sink Current (CC pin)  
Output Source Current for BP  
Output Sink Current for BP  
Operation Current  
2
-
-50  
2
mA  
A  
A  
A  
A  
mA  
A  
-10  
0.5  
200  
200  
-
-25  
0.8  
500  
550  
2.6  
-
-
-
5
Standby Current  
Cord=0, Motor=0  
-
30  
Minus Delta Voltage to Terminate Fast-  
Charge detected by VB pin (per cell)  
Internal reference voltage for Maximum  
Battery Voltage Protection  
-
4
5
7
mV  
-V  
VBMAX  
VBLOW  
VBSTOP  
-
-
-
1.95  
1.6  
2.00  
1.65  
1.45  
2.08  
1.7  
V
V
V
Internal reference voltage for Low Battery  
Internal reference voltage for No Power to  
Stop Motor  
1.40  
1.50  
VCORD  
FOSC  
Threshold voltage for Cord on /off  
Frequency of Internal Oscillator  
-
-
0.55  
29  
0.60  
32  
0.65  
35  
V
kHz  
CTMAX=90mins,  
Measure 90s  
CTMAX=60mins,  
Measure 60s  
CTMAX=30mins,  
Measure 30s  
VT voltage change value for dT/dt  
protection  
ΔVT  
13.5  
15  
16.5  
mV  
CTMAX=150mins,  
Measure 150s  
VT voltage for Maximum Battery  
Temperature 55C or NTC short  
VTMAX  
VTNTCO  
-
-
0.355  
1.05  
0.375  
1.10  
0.395  
1.15  
V
V
VT voltage for NTC open  
12-07-0005  
PT0268-1 07/05/12  
14  
PT8A2707-12/17-19  
Charger Controller  
with Fuel-Guage & LCD/LED Display  
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||  
Application Circuit  
1) Typical 2-Cell 1-hr Fast-Charge Application Circuit for PT8A2707/ 17  
(SLIDE Switch Model with LCD display)  
AC/DC Adapter: 4V 650mA,  
Battery Capacity: 650-730mAh,  
Safety charge timer: 1.5hrs  
68  
R6  
VDC  
1N4148  
L1  
D1  
AC/DC Adapter 4V 650mA  
D5 1N5817  
B772  
0.1Ω,1%,1/8W  
VBAT  
2.4V, 650m AH  
DC  
Q 1  
47u H/1A  
R9  
R7  
33k  
R1  
R8  
C 4  
10u F  
R5  
330  
C 1  
24K  
D2  
33k  
100u F  
R18  
R3  
240  
1N5817  
C 5  
GND  
220K  
C 11  
R2  
1u F  
7.5K  
0.1u F  
Pu ll -u p to VBAT  
to en ter m an u factu rin g  
te st m ode  
Q 2  
MMBT2222  
C 2  
C 3  
R4  
20k  
VBAT  
1u F  
1u F  
J1  
2
1
IC 1  
VBAT  
1
2
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
14  
13  
CHARGE  
CORD  
TEST  
BP  
VMSTOP  
ISENDC  
ISENFG  
ISENCOM  
CC  
R19  
47K  
3
U1  
4
M1  
1u F  
C 7  
5
L100  
L80  
+
6
D3  
VDD  
VBAT  
C 10  
1u F  
7
A
L60  
TIMER  
VEE  
C 6  
8
-
L40  
R13  
33K  
9
10u F  
L20  
VT  
R11  
75K  
VBLO W  
VB  
10  
11  
12  
BLI  
VBLOW  
VB  
VBLO W  
GND  
MOTOR  
LC D DIS PLAY  
R14  
36K  
VBAT  
SLIDE  
Q 3  
S 1  
R12  
180K  
C 8  
1u F  
C 9  
VB  
C 12  
0.1u F  
S e t VB=2.0V(for Max VBAT=3.4V)  
S e t VBLO W =1.69V  
R17  
100  
1u F  
D882  
R15  
100K  
(for Batte ry-Low VBAT=2.1V)  
S e t VBLO W =1.45V  
1N4148  
D4  
(for No-Powe r VBAT=1.8V)  
Note : C 11 an d C 12 are u se d for i m provin g syste m stabi li ty ,n ot i nte gran t for whol e syste m  
Figure 3: PT8A2707/17 LCD Display SLIDE Switch Application Circuit  
12-07-0005  
PT0268-1 07/05/12  
15  
PT8A2707-12/17-19  
Charger Controller  
with Fuel-Guage & LCD/LED Display  
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||  
2) Typical 2-Cell 1-hr Fast-Charge Application Circuit for PT8A2708/18  
(DSTACT Switch Model with LCD display)  
AC/DC Adapter: 4V 650mA,  
Battery Capacity: 650-730mAh,  
Safety charge timer: 1.5hrs  
68  
R6  
VDC  
1N4148  
L1  
D1  
AC/DC Adapter 4V 650mA  
D5 1N5817  
B772  
0.1Ω,1%,1/8W  
VBAT  
2.4V, 650m AH  
DC  
Q 1  
47u H/1A  
R9  
R7  
33k  
R1  
R8  
C 4  
10u F  
R5  
330  
C 1  
24K  
D2  
33k  
100u F  
R18  
R3  
240  
1N5817  
C 5  
GND  
220K  
C 11  
R2  
1u F  
7.5K  
0.1u F  
Pu ll -u p to VBAT  
to en ter m an u factu rin g  
te st m ode  
Q 2  
MMBT2222  
C 2  
C 3  
R4  
20k  
VBAT  
1u F  
1u F  
J1  
2
1
IC 1  
VBAT  
1
2
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
14  
13  
CHARGE  
CORD  
TEST  
BP  
VMSTOP  
ISENDC  
ISENFG  
ISENCOM  
CC  
R19  
47K  
3
U1  
4
M1  
1u F  
C 7  
5
L100  
L80  
+
6
D3  
VDD  
VBAT  
C 10  
1u F  
7
A
L60  
TIMER  
VEE  
C 6  
8
-
L40  
R13  
33K  
9
10u F  
L20  
VT  
R11  
75K  
VBLO W  
VB  
10  
11  
12  
BLI  
VBLOW  
VB  
VBLO W  
GND  
MOTOR  
LC D DIS PLAY  
R14  
36K  
VBAT  
DSTACT  
Q 3  
S 1  
R12  
180K  
C 8  
1u F  
C 9  
VB  
C 12  
0.1u F  
S e t VB=2.0V(for Max VBAT=3.4V)  
S e t VBLO W =1.69V  
R17  
100  
1u F  
D882  
R15  
(for Batte ry-Low VBAT=2.1V)  
S e t VBLO W =1.45V  
(for No-Powe r VBAT=1.8V)  
100K  
1N4148  
D4  
Note : C 11 an d C 12 are u se d for i m provin g syste m stabi li ty ,n ot i nte gran t for whol e syste m  
Figure 4: PT8A2708/18 LCD Display Dual-speed DSTACT Switch Application Circuit  
12-07-0005  
PT0268-1 07/05/12  
16  
PT8A2707-12/17-19  
Charger Controller  
with Fuel-Guage & LCD/LED Display  
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||  
3) Typical 2-Cell 1-hr Fast-Charge Application Circuit for PT8A2709/19  
(TACT Switch Model with LCD display)  
AC/DC Adapter: 4V 650mA,  
Battery Capacity: 650-730mAh,  
Safety charge timer: 1.5hrs  
68  
R6  
VDC  
1N4148  
L1  
D1  
AC/DC Adapter 4V 650mA  
D5 1N5817  
B772  
0.1Ω,1%,1/8W  
VBAT  
2.4V, 650m AH  
DC  
Q 1  
47u H/1A  
R9  
R7  
33k  
R1  
R8  
C 4  
10u F  
R5  
330  
C 1  
24K  
D2  
33k  
100u F  
R18  
R3  
240  
1N5817  
C 5  
GND  
220K  
C 11  
R2  
1u F  
7.5K  
0.1u F  
Pu ll -u p to VBAT  
to en ter m an u factu rin g  
te st m ode  
Q 2  
MMBT2222  
C 2  
C 3  
R4  
20k  
VBAT  
1u F  
1u F  
J1  
2
1
IC 1  
VBAT  
1
2
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
14  
13  
CHARGE  
CORD  
TEST  
BP  
VMSTOP  
ISENDC  
ISENFG  
ISENCOM  
CC  
R19  
47K  
3
U1  
4
M1  
1u F  
C 7  
5
L100  
L80  
+
6
D3  
VDD  
VBAT  
C 10  
1u F  
7
A
L60  
TIMER  
VEE  
C 6  
8
-
L40  
R13  
33K  
9
10u F  
L20  
VT  
R11  
75K  
VBLO W  
VB  
10  
11  
12  
BLI  
VBLOW  
VB  
VBLO W  
GND  
MOTOR  
LC D DIS PLAY  
R14  
36K  
VBAT  
TACT  
Q 3  
S 1  
R12  
180K  
C 8  
1u F  
C 9  
VB  
C 12  
0.1u F  
R17  
100  
S e t VB=2.0V(for Max VBAT=3.4V)  
S e t VBLO W =1.69V  
1u F  
D882  
R15  
100K  
(for Batte ry-Low VBAT=2.1V)  
S e t VBLO W =1.45V  
1N4148  
D4  
(for No-Powe r VBAT=1.8V)  
Note : C 11 an d C 12 are u se d for i m provin g syste m stabi li ty ,n ot i nte gran t for whol e syste m  
Figure 5: PT8A2709/19 LCD Display TACT Switch Application Circuit  
12-07-0005  
PT0268-1 07/05/12  
17  
PT8A2707-12/17-19  
Charger Controller  
with Fuel-Guage & LCD/LED Display  
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||  
4) Typical 2-Cell 1-hr Fast-Charge Application Circuit for PT8A2710  
(SLIDE Switch Model with LED display)  
AC/DC Adapter: 4V 650mA,  
Battery Capacity: 650-730mAh,  
Safety charge timer: 1.5hrs  
68  
R6  
VDC  
1N4148  
L1  
D1  
AC/DC Adapter 4V 650mA  
D5 1N5817  
B772  
0.1Ω,1%,1/8W  
VBAT  
2.4V, 650m AH  
DC  
Q 1  
47u H/1A  
R9  
R7  
33k  
R1  
R8  
C 4  
10u F  
R5  
330  
C 1  
24K  
D2  
33k  
100u F  
R18  
R3  
240  
1N5817  
C 5  
GND  
220K  
C 11  
R2  
1u F  
7.5K  
0.1u F  
Pu ll -u p to VBAT  
to en ter m an u factu rin g  
te st m ode  
Q 2  
MMBT2222  
C 2  
C 3  
R4  
20k  
VBAT  
1u F  
1u F  
J1  
2
1
IC 1  
VBAT  
1
2
3
4
5
6
7
8
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
14  
13  
CHARGE  
CORD  
TEST  
L100  
L80  
VMSTOP  
ISENDC  
ISENFG  
ISENCOM  
CC  
R19  
47K  
100%  
80%  
60%  
40%  
20%  
VDC  
LED1  
LED2  
LED3  
LED4  
LED5  
LED6  
LED7  
M1  
1u F  
C 7  
+
D3  
L60  
VDD  
VBAT  
C 10  
1u F  
A
L40  
TIMER  
VEE  
C 6  
-
L20  
R13  
33K  
Motor on  
BLI  
9
10  
11  
12  
10u F  
LMON  
BLI  
VT  
R11  
75K  
VBLO W  
VB  
VBLOW  
VB  
VBLO W  
GND  
R14  
36K  
VBAT  
MOTOR  
SLIDE  
Q 3  
S 1  
R12  
180K  
C 8  
1u F  
C 9  
VB  
C 12  
0.1u F  
S e t VB=2.0V(for Max VBAT=3.4V)  
S e t VBLO W =1.69V  
R17  
100  
1u F  
D882  
R15  
(for Batte ry-Low VBAT=2.1V)  
S e t VBLO W =1.45V  
(for No-Powe r VBAT=1.8V)  
100K  
1N4148  
D4  
Note : C 11 an d C 12 are u se d for i m provin g syste m stabi li ty ,n ot i nte gran t for whol e syste m  
Figure 6: PT8A2710 LED Display SLIDE Switch Application Circuit  
12-07-0005  
PT0268-1 07/05/12  
18  
PT8A2707-12/17-19  
Charger Controller  
with Fuel-Guage & LCD/LED Display  
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||  
5) Typical 2-Cell 1-hr Fast-Charge Application Circuit for PT8A2711  
(DSTACT Switch Model LED display)  
AC/DC Adapter: 4V 650mA,  
Battery Capacity: 650-730mAh,  
Safety charge timer: 1.5hrs  
68  
R6  
VDC  
1N4148  
L1  
D1  
AC/DC Adapter 4V 650mA  
D5 1N5817  
B772  
0.1Ω,1%,1/8W  
VBAT  
2.4V, 650m AH  
DC  
Q 1  
47u H/1A  
R9  
R7  
33k  
R1  
R8  
C 4  
10u F  
R5  
330  
C 1  
24K  
D2  
33k  
100u F  
R18  
R3  
240  
1N5817  
C 5  
GND  
220K  
C 11  
R2  
1u F  
7.5K  
0.1u F  
Pu ll -u p to VBAT  
to en ter m an u factu rin g  
te st m ode  
Q 2  
MMBT2222  
C 2  
C 3  
R4  
20k  
VBAT  
1u F  
1u F  
J1  
2
1
IC 1  
VBAT  
1
2
3
4
5
6
7
8
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
14  
13  
CHARGE  
CORD  
TEST  
L100  
VMSTOP  
ISENDC  
ISENFG  
ISENCOM  
CC  
R19  
47K  
100%  
80%  
60%  
40%  
20%  
VDC  
LED1  
LED2  
LED3  
LED4  
LED5  
LED6  
LED7  
M1  
1u F  
C 7  
L80  
+
D3  
L60  
VDD  
VBAT  
C 10  
1u F  
A
L40  
TIMER  
VEE  
C 6  
-
L20  
R13  
33K  
Motor on  
BLI  
9
10  
11  
12  
10u F  
LTURBO  
BLI  
VT  
R11  
75K  
VBLO W  
VB  
VBLOW  
VB  
VBLO W  
GND  
R14  
36K  
VBAT  
MOTOR  
DSTACT  
Q 3  
S 1  
R12  
180K  
C 8  
1u F  
C 9  
VB  
C 12  
0.1u F  
S e t VB=2.0V(for Max VBAT=3.4V)  
S e t VBLO W =1.69V  
R17  
100  
1u F  
D882  
R15  
(for Batte ry-Low VBAT=2.1V)  
S e t VBLO W =1.45V  
(for No-Powe r VBAT=1.8V)  
100K  
1N4148  
D4  
Note : C 11 an d C 12 are u se d for i m provin g syste m stabi li ty ,n ot i nte gran t for whol e syste m  
Figure 7: PT8A2711 LED Display Dual-speed DSTACT Switch Application Circuit  
12-07-0005  
PT0268-1 07/05/12  
19  
PT8A2707-12/17-19  
Charger Controller  
with Fuel-Guage & LCD/LED Display  
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||  
6) Typical 2-Cell 1-hr Fast-Charge Application Circuit for PT8A2712  
(TACT Switch Model with LED display)  
AC/DC Adapter: 4V 650mA,  
Battery Capacity: 650-730mAh,  
Safety charge timer: 1.5hrs  
68  
R6  
VDC  
1N4148  
L1  
D1  
AC/DC Adapter 4V 650mA  
D5 1N5817  
B772  
0.1Ω,1%,1/8W  
VBAT  
2.4V, 650m AH  
DC  
Q 1  
47u H/1A  
R9  
R7  
33k  
R1  
R8  
C 4  
10u F  
R5  
330  
C 1  
24K  
D2  
33k  
100u F  
R18  
R3  
240  
1N5817  
C 5  
GND  
220K  
C 11  
R2  
1u F  
7.5K  
0.1u F  
Pu ll -u p to VBAT  
to en ter m an u factu rin g  
te st m ode  
Q 2  
MMBT2222  
C 2  
C 3  
R4  
20k  
VBAT  
1u F  
1u F  
J1  
2
1
IC 1  
VBAT  
1
2
3
4
5
6
7
8
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
14  
13  
CHARGE  
CORD  
TEST  
L100  
L80  
VMSTOP  
ISENDC  
ISENFG  
ISENCOM  
CC  
R19  
47K  
100%  
80%  
60%  
40%  
20%  
VDC  
LED1  
LED2  
LED3  
LED4  
LED5  
LED6  
LED7  
M1  
1u F  
C 7  
+
D3  
L60  
VDD  
VBAT  
C 10  
1u F  
A
L40  
TIMER  
VEE  
C 6  
-
L20  
R13  
33K  
Motor on  
BLI  
9
10  
11  
12  
10u F  
LMON  
BLI  
VT  
R11  
75K  
VBLO W  
VB  
VBLOW  
VB  
VBLO W  
GND  
R14  
36K  
VBAT  
MOTOR  
TACT  
Q 3  
S 1  
R12  
180K  
C 8  
1u F  
C 9  
VB  
C 12  
0.1u F  
S e t VB=2.0V(for Max VBAT=3.4V)  
S e t VBLO W =1.69V  
R17  
100  
1u F  
D882  
R15  
(for Batte ry-Low VBAT=2.1V)  
S e t VBLO W =1.45V  
(for No-Powe r VBAT=1.8V)  
100K  
1N4148  
D4  
Note : C 11 an d C 12 are u se d for i m provin g syste m stabi li ty ,n ot i nte gran t for whol e syste m  
Figure 8: PT8A2712 LED Display TACT Switch Application Circuit  
12-07-0005  
PT0268-1 07/05/12  
20  
PT8A2707-12/17-19  
Charger Controller  
with Fuel-Guage & LCD/LED Display  
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||  
7) Typical 2-Cell 1-hr 1.4A Fast-Charge Application Circuit for PT8A2711  
(DSTACT Switch Model LED display)  
AC/DC Adapter: 4.5V 1500mA,  
Battery Capacity: 1300mAh,  
Safety charge timer: 1.5hrs  
68oh m  
R6  
VDC  
1N4148  
L1  
D1  
AC /DC Adapter 4.5V 1000m A  
D5 1N5817  
0.068Ω,1%,1/8W  
Q 1 AO 6409  
VBAT  
2.4V, 1300m AH  
DC  
47u H/1.5A  
R9  
R1  
R8  
33k  
C 4  
10u F  
R5  
330  
R7  
33k  
C 1  
R20  
820  
24K  
D2  
R18  
100u F  
1N5817  
C 5  
GND  
220K  
R3  
430  
R2  
C 11  
1u F  
7.5K 0.1u F  
Pu ll -u p to VBAT  
to en ter m an u factu rin g  
te st m ode  
Q 2  
R4  
C 2  
C 3  
1u F  
1u F  
VBAT  
J1  
2
1
20k  
IC 1  
MMBT2222  
1
2
3
4
5
6
7
8
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
14  
13  
CHARGE  
VMSTOP  
ISENDC  
ISENFG  
ISENCOM  
CC  
R19  
47K  
CORD  
TEST  
L100  
L80  
100%  
80%  
60%  
40%  
20%  
VDC  
LED1  
LED2  
LED3  
LED4  
LED5  
LED6  
LED7  
M1  
1u F  
C 7  
+
D3  
VBAT  
L60  
VDD  
C 10  
1u F  
A
L40  
TIMER  
VEE  
C 6  
10u F  
-
R13  
43K  
L20  
Dual Speed  
9
LTURBO  
BLI  
VT  
BLI  
VBLO W  
VBLO W  
VB  
R11  
75K  
10  
VBLOW  
VB  
11  
12  
GND  
MOTOR  
R14  
22K  
VBAT  
Q 3  
DSTACT  
S 1  
R12  
180K  
AO 3416  
C 8  
1u F  
S e t VB=2.0V(for Max VBAT=3.4V)  
S e t VBLO W =1.69V  
(for Batte ry-Low VBAT=2.1V)  
S e t VBLO W =1.45V  
C 9  
VB  
C 12  
0.1u F  
1u F  
R15  
100K  
R10  
10K  
Figure 9: PT8A2711 1.4A fast-charge Application Circuit  
12-07-0005  
PT0268-1 07/05/12  
21  
PT8A2707-12/17-19  
Charger Controller  
with Fuel-Guage & LCD/LED Display  
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||  
Application instruction  
1.  
Self-Discharge Calibration  
During the idle state, the self-discharge rate of batteries is calibrated in the fuel-gauge counter. The self-discharge calibration rate  
is fixed at 1/128C per day, which corresponds to the NiMH battery characteristics at which the battery pack will be completely  
self-charged to zero in about 4 months in a storage temperature of about 20-35C.  
VEE  
2.  
Setting Battery Temperature Measurement  
RX  
The PT8A2707-12/2717-19 employs a thermistor with negative temperature coefficient to  
measure the battery‟s temperature. Since most thermistors are inherently nonlinear with respect  
to temperature, in order to reduce the effect of nonlinearity, a resistor-divider network in  
parallel with the thermistor is recommended. A typical application circuit is shown on the right  
side. The resistor-divider consists of RX and RY, which can be selected to adjust the peak  
temperature threshold (e.g. 55C) as well as dT/dt slope according to the characteristics of the  
employed thermistors. (The calculation methods will be provided in datasheet later)  
VT  
RY  
Figure 10  
3.  
Setting Charging Current  
The PT8A2707-12/2717-19 employs two internal references for DC/DC bulk converter to achieve constant current charging  
disregards to the input power supply voltages. For fast-charging, an internal reference voltage of 70mV is employed to compare  
with the voltage drop across the sensing resistor. For pre-charging or maintenance trickle-charging, an internal reference voltage  
of 7mV is employed to compare the voltage drop across the sensing resistor to achieve 1/10 of the fast-charging current. For  
example, when controlling a 700mA charging control, a 0.101/8W sensing resistor is required. When it is in the pre-charging or  
trickle-charge status, the current is controlled at 70mA (This is already excluding the additional current that may flow from the  
adapter to LCD screen or LEDs or even to the motor when loaded unless motor is drawing all current from adapter). When a  
higher charging current would be used for 1-hr charging for a higher capacity battery, the sensing resistor should be scaled  
proportionally to maintain the same reference voltages. For examples:  
Table 9: Charge Sensing Resistor Selection  
Charging Current  
700mA  
1.03A  
Pre-Charging & Maintenance Current  
Sensing Resistor  
0.10, 1/8W  
0.068, 1/8W  
0.054, 1/8W  
0.044, 1/8W  
70mA  
100mA  
130mA  
160mA  
1.3A  
1.6A  
Basically, the sense resistor is inversely proportional to the charging current. The power dissipation is maintained at about 0.07W.  
4. Setting dT/dt value to stop fast-charge  
The PT8A2707-12/2717-19 employs thermistor (NTC) as battery temperature sensor. When the rate of temperature change (dT/dt)  
reaches certain value, fast-charge is terminated. When design external NTC sampling circuit, user should consider that appropriate  
dT/dt value is depended on fast charge time and battery type. Table 16 shows the dT/dt value for different fast charge time.  
Suggested NTC sampling circuit is based on this table and dT/dt characteristics of the devices.  
Table 10: Rate of Temperature Change (dT/dt) to Terminate Fast-Charge  
Fast charge time and measure time  
dT/dt  
TFCMAX =90mins, Measure 90s  
TFCMAX =60mins, Measure 60s  
TFCMAX =30mins, Measure 30s  
TFCMAX =150mins, Measure 150s  
0.9C/min  
1.38C/min  
2.76C/min  
0.54C/min  
5.  
Setting Motor-Over-Current Protection Threshold  
By setting the VMSTOP pin, three motor-over-current voltage thresholds can be selected as follows:  
Table 11: Motor-Over-Current Setting  
VMSTOP  
Over-Current Reference Voltage  
300mV across sensing resistor  
350mV across sensing resistor  
210mV across sensing resistor  
GND  
0.6-1.0V  
VDD  
12-07-0005  
PT0268-1 07/05/12  
22  
PT8A2707-12/17-19  
Charger Controller  
with Fuel-Guage & LCD/LED Display  
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||  
Table 12: Design Reference for Current Limit  
Charging Current  
Sensing Resistor VMSTOP Setting Motor-over-current limit  
GND  
0.6-1.0V  
VDD  
GND  
0.6-1.0V  
VDD  
GND  
0.6-1.0V  
VDD  
3.0A (300mV/0.1Ω)  
3.5A (350mV/0.1Ω)  
2.1A (210mV/0.1Ω)  
4.4A (300mV/0.068Ω)  
5A (350mV/0.068Ω)  
3A (210mV/0.068Ω)  
6.8A (300mV/0.044Ω)  
8A (350mV/0.044Ω  
4.8A (210mV/0.044Ω))  
700mA  
0.10, 1/8W  
68m, 1/8W  
44m, 1/8W  
1A  
1.6A  
6.  
Setting Maximum Battery Protection and Low-Battery Detection Thresholds  
The ratio of RA: (RB+RC) sets the maximum battery detection and -△V detection window (+/-0.3V).  
The ratio of (RA+RB): RC sets the Battery-Low detection threshold.  
VB and VBLOW contain individual comparators with fixed internal reference.  
VB internal comparator reference voltage 2.0V (VMB comparator works when VBAT is above 2.4V)  
VBLOW internal comparator reference voltage 1.45V (No-Power threshold)  
VBLOW internal comparator second reference voltage 1.65V (Battery-Low threshold)  
-V detection reference voltage range at VB = 1.5V to 2.1V  
VBAT  
RA  
RB RC  
RA RB RC  
VBLOW  
VB  
1.45V VBL   
RB  
RC  
RC  
2.0V VMB   
RA RB RC  
Figure 11  
Example #1:  
No-Power threshold =VBL=1.8V, Maximum Battery Voltage=VMB=3.4V  
Assuming RC=100kΩ, RA and RB can be calculated as follows:  
RB= 36kΩ, RA=33kΩ  
In this setting, -ΔV is measured for battery voltage from 2.55V to 3.58V. (The internal ADC measures -8mV such that at the 2-cell  
battery pack the actual -ΔV is 10mV (i.e. -5mV/cell). For the Batttery-Low threshold, it will be about 2.0V  
Example #2:  
No-Power threshold =VBL=2.0V, Maximum Battery Voltage=VMB=3.5V  
Assuming RC=100kΩ, RA and RB can be calculated as follows:  
RB= 27kΩ, RA=48kΩ  
In this setting, -ΔV is measured for battery voltage from 2.625V to 3.675V. (The internal ADC measures -8mV such that at the 2-  
cell battery pack the actual -ΔV is 10mV (i.e. -5mV/cell). For the Battery-Low threshold, it will be about 2.25V  
Example #3:  
No-power threshold=VBL=2.7V (0.9V/cell), Maximum Battery Voltage=VMB=5.1V (1.7V/cell)  
Assuming RC=100kΩ, RA and RB can be calculated as follows:  
RB= 36kΩ, RA=118kΩ  
In this setting, -ΔV is measured for battery voltage from 3.85V to 5.35V. (The internal ADC measures -8mV such that at the 3-  
cell battery pack the actual -ΔV is 15mV (i.e. -5mV/cell). For the Battery-Low threshold, it will be about 3.3V  
12-07-0005  
PT0268-1 07/05/12  
23  
PT8A2707-12/17-19  
Charger Controller  
with Fuel-Guage & LCD/LED Display  
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||  
Mechanical Information  
SE (Lead free SOIC-24)  
PKG. DIMENSIONS(MM)  
SYMBOL  
MIN  
2.35  
0.10  
2.10  
0.33  
0.20  
15.20  
7.40  
10.21  
MAX  
2.65  
0.30  
2.50  
0.51  
0.33  
15.60  
7.60  
10.61  
A
A1  
A2  
b
Note:  
1) Controlling dimensions in millimeters.  
2) Ref: JEDEC MS-013E/AD  
c
D
E
E1  
e
1.27 BSC  
L
θ
0.40  
0°  
1.27  
8°  
12-07-0005  
PT0268-1 07/05/12  
24  
DENOTES DIMENSIONS  
PT8A2707-12/17-19  
Charger Controller  
with Fuel-Guage & LCD/LED Display  
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||  
HE (Lead free SSOP-24)  
PKG. DIMENSIONS(MM)  
SYMBOL  
MIN  
MAX  
1.73  
0.23  
1.60  
A
A1  
A2  
0.05  
1.40  
b
c
D
E
E1  
e
0.22  
0.09  
8.00  
5.10  
7.60  
0.38  
0.25  
8.40  
5.50  
8.00  
Note:  
1) Ref: JEDEC MO-150B/AG  
2) N=Number of pins  
0.65 BSC  
L
θ
0.55  
0°  
0.95  
8°  
N
24  
12-07-0005  
PT0268-1 07/05/12  
25  
PT8A2707-12/17-19  
Charger Controller  
with Fuel-Guage & LCD/LED Display  
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||  
Ordering Information  
Part No.  
Package Code  
Package  
PT8A2707SE*  
PT8A2708SE*  
PT8A2709SE*  
PT8A2710SE*  
PT8A2711SE*  
PT8A2712SE  
PT8A2717SE*  
PT8A2718SE*  
PT8A2719SE*  
PT8A2707HE*  
PT8A2708HE*  
PT8A2709HE*  
PT8A2710HE*  
PT8A2711HE*  
PT8A2712HE  
PT8A2717HE*  
PT8A2718HE*  
PT8A2719HE  
S
S
Lead free and Green 24-pin SOIC  
Lead free and Green 24-pin SOIC  
Lead free and Green 24-pin SOIC  
Lead free and Green 24-pin SOIC  
Lead free and Green 24-pin SOIC  
Lead free and Green 24-pin SOIC  
Lead free and Green 24-pin SOIC  
Lead free and Green 24-pin SOIC  
Lead free and Green 24-pin SOIC  
Lead free and Green 24-pin SSOP  
Lead free and Green 24-pin SSOP  
Lead free and Green 24-pin SSOP  
Lead free and Green 24-pin SSOP  
Lead free and Green 24-pin SSOP  
Lead free and Green 24-pin SSOP  
Lead free and Green 24-pin SSOP  
Lead free and Green 24-pin SSOP  
Lead free and Green 24-pin SSOP  
S
S
S
S
S
S
S
H
H
H
H
H
H
H
H
H
Note:  
E = Pb-free and Green  
Adding X Suffix= Tape/Reel  
*Contact Pericom for availability.  
Pericom Semiconductor Corporation 1-800-435-2336 www.pericom.com  
Pericom reserves the right to make changes to its products or specifications at any time, without notice, in order to improve design or performance and to supply  
the best possible product. Pericom does not assume any responsibility for use of any circuitry described other than the circuitry embodied in Pericom product. The  
company makes no representations that circuitry described herein is free from patent infringement or other rights, of Pericom.  
12-07-0005  
PT0268-1 07/05/12  
26