DS2441 Ver la hoja de datos (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS2441

1-Cell Li-Ion Battery Manager

Dallas Semiconductor -> Maxim Integrated 

DS2441

registers on the chip present the host with high-accuracy temperature, voltage, and current measurements

as well as information on remaining capacity and cycle life. Thirty-two bytes of general purpose memory

in the DS2441 are available for storing pack-specific information.

When the cell voltage reaches the undervoltage cutoff, the DS2441 automatically enters a low-power

mode in which it consumes only 1µA of battery current. When a battery charger is applied to the pack,

the DS2441 automatically leaves its low-power mode to support charging. A refresh feature in the

DS2441 allows even the most severely discharged battery packs to be refreshed and recharged. The

DS2441 also features a programmable I/O pin that allows the host system to sense and control other

electronics in the pack, such as vibration motors, speakers and LEDs.

DETAILED PIN DESCRIPTION Table 1

Pin

Symbol Description

1

GND Ground. System voltage reference. Connect this pin to the negative terminal

of the cell and to one side of the current sense resistor.

2

PIO Programmable Digital I/O. Use this user-definable pin to control features

such as a vibration motor or an LED driver, or to monitor an input signal such

as a tamper-sensing circuit.

3

ISENS Current Sense Input. The DS2441 measures the voltage between this pin

and GND to calculate the current flowing through the external sense resistor.

Connect this pin through an RC low-pass filter to the PACK- side of the sense

resistor.

4

VM Voltage Monitor Input. Not used on the DS2441. Connect to GND.

5

VDD Power Supply Input. The DS2441 draws operating power through this pin

and uses this pin and the GND pin to monitor the voltage of the cell. Voltage

on this pin must be between 2.4V and 10V for proper operation.

6

CHG Charge Control Output. Controls an external p-channel charge protection

FET. Open-drain output driver.

7

DCHG Discharge Control Output. Controls an external p-channel discharge

protection FET. Push-pull output driver.

8

DQ Data Input/Output. 1-Wire data line. Parasite power supply for memory

read/write operations. DS2441 power supply in Refresh Mode. Open-drain

output driver. Connect this pin to the DATA terminal of the battery pack. In

the host system, connect a 5 kΩ pullup from the DATA terminal to the

PACK+ terminal.

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