MCP73828 datasheet(8/24 Pages) MICROCHIP

8 / 24 page

MCP73828

DS21706A-page 8

 2002 Microchip Technology Inc.

3.0

PIN DESCRIPTION

The descriptions of the pins are listed in Table 3-1.

TABLE 3-1:

Pin Function Table.

3.1

Logic Shutdown (SHDN)

Input to force charge termination, initiate charge, or ini-

tiate recharge.

3.2

Battery Management 0V Reference

(GND)

Connect to negative terminal of battery.

3.3

Cell Temperature Monitor (THERM)

Charging is inhibited when the input is outside the

upper and lower threshold limits. Connection of a

10 k

Ω resistor between THERM and GND disables the

function when cell temperature monitoring is not

required.

3.4

Charge Complete Output (CD10)

Open-drain drive for connection to an LED for charge

complete indication. Alternatively, a pull-up resistor can

be applied for interfacing to a microcontroller. A low

impedance state indicates charging. A high impedance

indicates that the charge current has diminished below

10% of the peak charge current.

3.5

Cell Voltage Monitor Input (VBAT)

Voltage sense input. Connect to positive terminal of

battery. Bypass to GND with a minimum of 10 µF to

ensure loop stability when the battery is disconnected.

A precision internal resistor divider regulates the final

voltage on this pin to VREG.

3.6

Drive Output (VDRV)

Direct output drive of an external P-channel MOSFET

pass transistor for current and voltage regulation.

3.7

Charge Current Sense Input VSNS)

Charge current is sensed via the voltage developed

across an external precision sense resistor. The sense

resistor must be placed between the supply voltage

(VIN) and the source of the external pass transistor. A

50 m

Ω sense resistor produces a fast charge current of

1A, typically.

3.8

Battery Management Input Supply

(VIN)

A supply voltage of 4.5V to 5.5V is recommended.

Bypass to GND with a minimum of 10 µF.

Name

Description

SHDN

Logic Shutdown

GND

Battery Management

0V Reference

THERM

Cell Temperature Monitor

CD10

Charge Complete Output

5VBAT

Cell Voltage Monitor Input

6VDRV

Drive Output

7VSNS

Charge Current Sense Input

8VIN

Battery Management

Input Supply

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