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 k

Ω 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

DISABLE CHG

ENABLE CHG