L6924UTR datasheet(6/37 Pages) STMICROELECTRONICS

6 / 37 page

Pin description

L6924U

6/37

Doc ID 14716 Rev 2

I/O

Name

Pin description

ISEL

Switches between high power USB (IUSB up to 500 mA) and low

power USB (IUSB/5) in USB mode. A low level sets the L6924U in

low power mode and a high level sets the L6924U in high power

mode. When the AC mode is selected, the ISEL pin must be

connected to ground or left floating.

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 1.8 V ± 2 %)

I/O

IEND

Charge termination pin.

A resistor connected from this pin to GND sets the charge

termination current threshold IENDTH: if ICHG < IENDTH, the charge

process ends. The voltage across the resistor is proportional to the

current delivered to the battery (gas gauge function).

MODE

Selects pin AC adapter or USB port input modes. A high level sets

the L6924U in USB mode while a low level sets the L6924U in the

AC adapter mode. When the AC adapter input is selected, the ISEL

pin status does not affect the current set.

IUSB

Charge current program pin in USB mode: a resistor connected

from this pin to ground sets the fast charge current value (IUSB up to

500 mA) with an accuracy of 7 %. The USB high power/low power

mode is selected with the ISEL pin.

IAC

Charge current program pin in AC mode: a resistor connected from

this pin to GND sets the fast charge current value (IAC up to 1 A)

with an accuracy of 7 %.

Table 2.

Pin functions (continued)

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