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 (-
Δ
V) 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
1
PT0268-1
07/05/12
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
Family
members
PT8A2707
PT8A2708
PT8A2709
PT8A2710
PT8A2711
PT8A2712
PT8A2717
PT8A2718
PT8A2719
TACT
Switch
(ON/OFF)
SLIDE
Switch
(ON/OFF)
DSTACT Switch
(ON(70%)/100%
/OFF)
LCD
LED
Motor
Speed (70%
PWM)
LCD/LED
display in
idle mode
12-07-0005
2
PT0268-1
07/05/12
PT8A2707-12/17-19
Charger Controller
with Fuel-Guage & LCD/LED Display
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Flow Chart
POWER UP
cord
off
(1)
PRE
CHARGE
cord
on/off
cord
off
IDLE
> 55C
(8)
45C
fast
chg
(5)
motor
on/off
(2)(3)(4)
motor
on/off
(2)(3)(4)
motor
on/off
(2)(3)
STOP
CHARGE
> 55C
(8)
45C
FAST
CHARGE
MOTOR
> 55C
(8)
motor
on/off
Full
Bat.
(6)
(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 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
3
PT0268-1
07/05/12
PT8A2707-12/17-19
Charger Controller
with Fuel-Guage & LCD/LED Display
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Pin Assignment and Description
CHARGE
CORD
TEST
BP
L100
L80
L60
L40
L20
1
2
3
4
5
6
7
8
9
24
23
22
21
20
19
18
17
16
15
14
13
VMSTOP
ISENDC
ISENFG
ISENCOM
CC
VDD
TIMER
VEE
VT
VBLOW
VB
SLIDE
CHARGE
CORD
TEST
BP
L100
L80
L60
L40
L20
1
2
3
4
5
6
7
8
9
24
23
22
21
20
19
18
17
16
15
14
13
VMSTOP
ISENDC
ISENFG
ISENCOM
CC
VDD
TIMER
VEE
VT
VBLOW
VB
DSTACT
CHARGE
CORD
TEST
BP
L100
L80
L60
L40
L20
1
2
3
4
5
6
7
8
9
24
23
22
21
20
19
18
17
16
15
14
13
VMSTOP
ISENDC
ISENFG
ISENCOM
CC
VDD
TIMER
VEE
VT
VBLOW
VB
TACT
PT8A2707/17
PT8A2708/18
PT8A2709/19
BLI
10
GND
MOTOR
11
12
BLI
10
GND
MOTOR
11
12
BLI
10
GND
MOTOR
11
12
PT8A2707/17 pins assignment
PT8A2708/18 pins assignment
PT8A2709/19 pins assignment
Table 1: PT8A2707-2709 and PT8A2717-2719 LCD Pattern Pin Description
PIN
I/O
Name
Descriptions
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
O
I
I
O
O
O
O
O
O
O
-
I/O
I
I
I
I
O
O
-
I/O
I
I
I
I
CHARGE
CORD
TEST
BP
L100
L80
L60
L40
L20
BLI
GND
MOTOR
SLIDE
DSTACT
TACT
VB
VBLOW
VT
VEE
TIMER
VDD
CC
ISENCOM
ISENFG
ISENDC
VMSTOP
PWM DC/DC controller output for constant current regulation
External DC supply existence detection
Quick test mode
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
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
Compensation capacitor for DC/DC converter
Current sense reference plane
Fuel gauge current sense input
DC/DC controller current sense input
Pin Config
Current Limit
GND
4.2x charging current
Motor stop current limit value
select input
0.6-1.0V
5x charging current
VDD
3x charging current
12-07-0005
4
PT0268-1
07/05/12
PT8A2707-12/17-19
Charger Controller
with Fuel-Guage & LCD/LED Display
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CHARGE
CORD
TEST
L100
L80
L60
L40
L20
NA
1
2
3
4
5
6
7
8
9
24
23
22
21
20
19
18
17
16
15
14
13
VMSTOP
ISENDC
ISENFG
ISENCOM
CC
VDD
TIMER
VEE
VT
VBLOW
VB
SLIDE
CHARGE
CORD
TEST
L100
L80
L60
L40
L20
LTURBO
1
2
3
4
5
6
7
8
9
24
23
22
21
20
19
18
17
16
15
14
13
VMSTOP
ISENDC
ISENFG
ISENCOM
CC
VDD
TIMER
VEE
VT
VBLOW
VB
DSTACT
CHARGE
CORD
TEST
L100
L80
L60
L40
L20
NA
1
2
3
4
5
6
7
8
9
24
23
22
21
20
19
18
17
16
15
14
13
VMSTOP
ISENDC
ISENFG
ISENCOM
CC
VDD
TIMER
VEE
VT
VBLOW
VB
TACT
PT8A2710
PT8A2711
PT8A2712
BLI
10
GND
MOTOR
11
12
BLI
10
GND
MOTOR
11
12
BLI
10
GND
MOTOR
11
12
PT8A2710 pins assignment
PT8A2711 pins assignment
PT8A2712 pins assignment
Table 2: PT8A2710-2712 LED Pattern Pin Description
PIN
I/O
Name
Descriptions
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
O
I
I
O
O
O
O
O
O
O
-
I/O
I
I
I
I
O
O
-
I/O
I
I
I
I
CHARGE
CORD
TEST
L100
L80
L60
L40
L20
NA
LTURBO
BLI
GND
MOTOR
SLIDE
DSTACT
TACT
VB
VBLOW
VT
VEE
TIMER
VDD
CC
ISENCOM
ISENFG
ISENDC
VMSTOP
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
Motor “Turbo-Mode” Indicator (PT8A2711)[Normal speed, OFF]
Battery-low output (Remaining <10% capacity)
Ground
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
DC/DC controller current sense input
Pin Config
Current Limit
GND
4.2x charging current
Motor stop current limit value
select input
0.6-1.0V
5x charging current
VDD
3x charging current
12-07-0005
5
PT0268-1
07/05/12
嵌入式系统
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