2762A25 Просмотр технического описания (PDF) - Maxim Integrated

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2762A25

High-Precision Li+ Battery Monitor With Alerts

Maxim Integrated 

DS2762 High-Precision Li+ Battery Monitor With Alerts

PIN DESCRIPTION

PIN

TSSOP

FLIP

CHIP

1

C1

2

B1

3

B2

4, 5, 6

A3

SYMBOL

FUNCTION

CC

PLS

DC

SNS

Charge Protection Control Output. Controls an external P-channel high-side charge

protection FET.

Battery Pack Positive Terminal Input. The DS2762 monitors the pack plus terminal

through PLS to detect overcurrent and overload conditions, as well as the presence of a

charge source. Additionally, a charge path to recover a deeply depleted cell is provided

from PLS to VDD. In sleep mode (with SWEN = 0), any capacitance or voltage source

connected to PLS is discharged internally to VSS through 200µA (nominal) to assure

reliable detection of a valid charge source. For details of other internal connections to

PLS and associated conditions see the Li+ Protection Circuitry section.

Discharge Protection Control Output. Controls an external P-channel high-side

discharge protection FET.

Sense Resistor Connection. Connect to the negative terminal of the battery pack. In

the internal sense resistor configuration, the sense resistor is connected between VSS

and SNS.

7

B4

DQ

Data Input/Out. 1-Wire data line. Open-drain output driver. Connect this pin to the DATA

terminal of the battery pack. Pin has an internal 1mA pulldown for sensing disconnection.

8

C4

IS2

Current-Sense Input. This pin is internally connected to SNS through a 4.7kW resistor.

9

D4

10

E4

11, 12, 13

F3

14

E2

15

E1

16

D1

—

C2

—

D2

IS1

PS

VSS

PIO

VDD

VIN

SNS

Probe

VSS

Probe

Current-Sense Input. This pin is internally connected to VSS through a 4.7kW resistor.

Connect a 0.1mF capacitor between IS1 and IS2 to complete a lowpass input filter.

Power Switch Sense Input. The device wakes up from sleep mode when it senses the

closure of a switch to VSS on this pin. Pin has an internal 1mA pullup to VDD.

Device Ground. Connect directly to the negative terminal of the Li+ cell. For the external

sense resistor configuration, connect the sense resistor between VSS and SNS.

Programmable I/O Pin. Can be configured to be used to control and monitor user-

defined external circuitry or as an interrupt output to alert the host when preset current

accumulator or temperature limits are exceeded. Open drain to VSS.

Power-Supply Input. Connect to the positive terminal of the Li+ cell through a

decoupling network.

Voltage Sense Input. The voltage of the Li+ cell is monitored through this input pin. This

pin has a weak pullup to VDD.

Do not connect.

Do not connect.

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