M62244FP
Description of pins
Pin
No. name
Protection diode
Positive Negative
gnd1
I/O Function
18
16
17
Vcc
Power-supply input
LED drive
LED1
LED2
O
Vcc
Vcc
gnd2
gnd2
I/O LED drive (with function for switching the LEDs’ blinking period)
The blinking period of LED1 is set to 0.6 Hz (typ.) by fixing this signal
low.
15
9
GND2
STP
Ground for power supply
I
Forcible charge OFF
H (or open): Charging possible, L: Charging stopped
Vcc
Vcc
gnd1
gnd1
8
COSC
For connection to the capacitor used to set the oscillator circuit’s
frequency
12
5
GND1
Tdet
Ground
I
Battery-temperature detection
Reference power-supply output
Vcc
Vcc
Vcc
gnd1
gnd1
gnd1
10
6
Vref
O
I
Vrchg
Adjustment of start-recharging voltage
The pin voltage is set to 1.0 V (typ.). The voltage at which recharging
starts (threshold) may be changed by using an external resistor etc. to
adjust the voltage on this pin. The actual voltage is the voltage on this
pin multiplied by 11.8 dB.
20
1
Idet1
Idet2
I
I
Charging-current detection
gnd1
The drop in voltage across an external resistor RS (connected between
these pins) reflects the size of the charging current and is used to detect
the completion of charging.
2
7
Vsense I/O Battery-voltage detection
Detects the battery-voltage value for use in charging control.
gnd1
gnd1
Ifull
I
Charging-completed current switching
Vcc
Select the current taken as indicating the completion of charging by
leaving this pin open or connecting it to ground. The charging-completed
current is controlled by comparing the voltage on the Ifull pin with the
level 12 dB above the voltage drop between Idet1 and Idet2.
13
14
C1
C2
Compensation for the charge-control phase
A capacitor between C1 and ground improves the stability of oscillation
during charging at constant current and constant voltage.
Vcc
Vcc
gnd1
gnd1
For connection of a capacitor that comes into play during switching of
the charging current
Reduces overshooting of the charging current when the charging current
is switched.
19
3
CTRL
O
I
Output for charge control
Controls the base (gate of a p-ch transistor) of an external pnp transistor
so that constant-current or constant-voltage charging is applied.
gnd2
gnd1
Vadp1
For adjusting the adapter-detection voltage 1 (detection voltage when
charging has stopped)
Pin-voltage is set to 1.0 V (typ.). The value to be taken as adapter-
detection voltage 1 is controlled by using an external resistor etc. to
adjust the voltage on this pin. The actual voltage is the voltage on this
pin multiplied by 14.3.
Vcc
Vcc
Vcc
4
Vadp2
I
For adjusting the adapter-detection voltage 2 (detection voltage during
charging)
Pin-voltage is set to 1.0 V (typ.). The value to be taken as adapter-
detection voltage 2 is controlled by using an external resistor etc. to
adjust the voltage on this pin. The actual voltage is the voltage on this
pin multiplied by 13.9dB.
gnd1
gnd1
11
Vcvref
O
Reference voltage for constant-voltage control
Rev.1.0, Sep.19.2003, page 2 of 17
RENESAS [ RENESAS TECHNOLOGY CORP ]
