STBC02 datasheet(19/39 Pages) STMICROELECTRONICS

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STBC02

Functional pin description

DocID029261 Rev 2

19/39

Functional pin description

6.1

GND, AGND

The STBC02 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 discharging. 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 450 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 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

Battery voltage measurement. 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. This function can be enabled / disabled by SWIRE. To minimize

overall system power consumption, this function must be disabled.

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