VFQFPN16(2008) Просмотр технического описания (PDF) - STMicroelectronics

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VFQFPN16
(Rev.:2008)

USB compatible battery charger system with integrated power switch for Li-Ion/Li-Polymer

STMicroelectronics 

Pin description

L6924U

Table 2.

Pin

9

10

11

12

13

14

15

16

Pin functions (continued)

I/O

Name

Pin description

Switch from 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

I

ISEL 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.

I

VOSNS

Output voltage sense pin.

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

O

VOUT Output pin. (connected to the battery)

O

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

Charge termination pin.

A resistor connected from this pin to GND fixes the charge

I/O

IEND 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).

Select pin between AC adapter and USB port. A high level sets the

I

MODE

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.

Charge current program pin in USB mode: a resistor connected

I

IUSB

from this pin to ground fixes 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.

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

I

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

with an accuracy of 7 %.

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