STBC03 datasheet(18/34 Pages) STMICROELECTRONICS

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Functional pin description

STBC03

18/34

DocID029927 Rev 2

Functional pin description

6.1

GND, AGND

The STBC03 ground pins.

6.2

NTC

The battery temperature monitoring pin. Connect the battery NTC thermistor to this pin.

The charging cycle stops when the battery temperature is outside of the safe temperature

range (0 °C to 45 °C). When the charging cycle is completed, the NTC pin goes to a high

impedance state, therefore the NTC thermistor can be also used, together with an external

circuitry, to monitor the battery temperature while it is being discharged. If the NTC

thermistor is not used, a 10 kΩ resistor must be connected to ensure proper IC operations.

6.3

ISET and IPRE

Fast and pre-charge current programming pins. Connect two resistors (RISET, RIPRE) to

ground to set the fast and pre-charge current (IFAST, IPRE) according to the following

equation (valid for IFAST, IPRE > 5 mA):

Equation 1:

�� =

��

∗ ��; �� =

��

∗ ��

Where VISET = VIPRE = 1 V and K = 200. Fast charge and pre-charge currents can be

independently set from 1 mA to 650 mA. End-of-charge current value is typically 5% of the

fast charging current value being set.

For low charging current (IFAST, IPRE < 5 mA), the RISET and RIPRE values in the following

table must be used.

Table 6: Charging current setting

IFAST, IPRE

RISET, RIPRE

5 mA

40.5 k

2 mA

110 k

1 mA

260 k

Both RISET and RIPRE must be always used. Short-circuit to ground or open circuit are not

allowed options.

6.4

BATMS, BATMS_EN

Battery voltage measurement. If BATMS_EN is high, the BATMS pin is internally shorted to

the BATSNS pin during normal conditions to monitor the battery voltage using external

components (µC and embedded ADC). The internal path from BATMS pin to the battery is

opened in case any of the following conditions occur: overcurrent, battery over-discharge,

shutdown mode, short-circuit on SYS or LDO. To minimize overall system power

consumption, this function must be disabled. BATMS_EN pin should be pulled low.

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