L6924D_07 datasheet(6/38 Pages) STMICROELECTRONICS

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Pins description and connection diagrams

L6924D

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2.1

Pin description

Table 2.

Pin functions

I/O

Name

Pin description

VIN

Input pin of the power stage.

VINSNS

Supply voltage pin of the signal circuitry.

The operating input voltage range is from 2.5V and 12V, and the start-up

threshold is 4V.

3-4

ST2-ST1 Open-collector status pins.

TPRG

Maximum charging time program pin.

It must be connected with a capacitor to GND to fix the maximum charging time,

see Chapter 7.8: Maximum charging time on page 22

GND

Ground pin.

Shutdown pin.

When connected to GND enables the device; when floating disables the device.

Temperature monitor pin.

It must be connected to a resistor divider including an NTC or PTC resistor. The

charge process is disabled if the battery temperature (sensed through the NTC or

PTC) is out of the programmable temperature window see Chapter 8.1: NTC

thermistor on page 25 .

VOPRG

Output voltage selection pin.

If is it floating, VOUT = 4.1V. If is it connected to GND, VOUT = 4.2V.

VOSNS

Output voltage sense pin.

It senses the battery voltage to control the voltage regulation loop.

VOUT

Output pin. (connected to the battery)

VREF

External reference voltage pin.(reference voltage is 1.8V±2%)

I/O

IEND

Charge termination pin.

A resistor connected from this pin to GND fixes the charge termination current

threshold IENDTH: if I < IENDTH, the charger behaves according to the VPRE status

(see Chapter 7.5: End-of-charge current on page 20). The voltage across the

resistor is proportional to the current delivered to the battery (Gas Gauge

function).

VPRE

Multifunction pin.

A resistor connected to GND allows the user to adjust the pre-charge voltage

threshold VPRETH.

– If the pin is floating, VPRETH = 2.8V. If the voltage on VPRE pin is lower than

0.8V, VPRETH = 2.8V and the charge is not automatically terminated when I <

IENDTH.

– If the voltage on VPRE goes lower than 0.5V (edge sensitive), the maximum

charging time is reset.

IPRG

Charge current program pin.

A resistor connected from this pin to GND, fixes the fast charge current value

(ICHG), with an accuracy of 7%.

IPRE

Pre-charge current program pin.

If the pin is floating IPRETH is equal to 10% of ICHG. If IPRETH has to be

programmed at a different value, the pin has to be connected to GND or VREF

through a resistor see Chapter 7.2: Pre-charge current on page 18.

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