Datasheet

Functional pin description STNS01
14/29 DocID024654 Rev 2
If the charger is temporarily stopped because of the battery temperature being out of the
normal range, a logic low level on the CEN pin disables the charger and resets the charging
timeout timers. If CEN is then driven high again the charger is restarted only if a no-fault
condition is active (including battery temperature out of range).
This pin has an internal 500 kΩ pull-up resistor connected to LDO and must be left floating
or tied high at power on.
Figure 17. Charge disable / enable
Pin 7: GND
Device ground pin.
Pin 8: NTC
Battery temperature monitoring pin. Connect the battery's NTC resistor to this pin. The
charging cycle is put on hold when the battery temperature is outside of the safe
temperature range (0 °C to 45 °C). See Section 8.3 for more details.
Pin 9: ISET
Fast-charge current programming pin. Connect a resistor (R
ISET
) to ground to set the fast-
charge current (I
FAST
) according to the following equation:
I
FAST
= V
ISET
/ R
ISET
* K
Where V
ISET
= 1 V and K = 200. Fast-charge currents ranging from 15 mA to 200 mA can
be programmed. Pre-charge current and end of charge current are scaled accordingly.
Charging currents higher than 200 mA can be programmed but the increased voltage drop
over internal MOSFETs can limit the minimum input voltage (V
IN
) needed to obtain full
charge.
Pin 10: BATMS
Battery voltage measurement pin. This pin is internally shorted to the BATSNS pin during
normal operating conditions to monitor the battery voltage. The BATMS pin is disconnected
from the battery if the LDO output voltage drops to zero (battery discharge overcurrent,
battery overdischarge, shutdown mode, short-circuit on SYS or LDO).
VIN
3 V/div
CEN
3 V/div
VBAT
3 V/div
I
CHG
0.1 A/div
100 ms/div
V
IN = 5.0 V, V BAT = 3.2 V, I CHG = 80 mA
DISABLE CHG
ENABLE CHG