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L6924D Datasheet(PDF) 6 Page - STMicroelectronics

Part # L6924D
Description  Battery charger system with integrated power switch for Li-ION/Li-POLYMER
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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Pins description and connection diagrams
L6924D
6/38
2.1
Pin description
Table 2.
Pin functions
Pin
I/O
Name
Pin description
1
I
VIN
Input pin of the power stage.
2
I
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
O
ST2-ST1 Open-collector status pins.
5
I
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
6
-
GND
Ground pin.
7
I
SD
Shutdown pin.
When connected to GND enables the device; when floating disables the device.
8
I
TH
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 .
9
I
VOPRG
Output voltage selection pin.
If is it floating, VOUT = 4.1V. If is it connected to GND, VOUT = 4.2V.
10
I
VOSNS
Output voltage sense pin.
It senses the battery voltage to control the voltage regulation loop.
11
O
VOUT
Output pin. (connected to the battery)
12
O
VREF
External reference voltage pin.(reference voltage is 1.8V±2%)
13
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).
14
I
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.
15
I
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%.
16
I
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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