MCP73855T datasheet(10/24 Pages) MICROCHIP

10 / 24 page

MCP73853/55

DS21915A-page 10

 2004 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

Voltage Regulation Selection

(VSET)

Connect to VSS for 4.1V regulation voltage. Connect to

VDD for 4.2V regulation voltage.

3.2

Battery Management Input Supply

(VDD1, VDD2)

A supply voltage of [VREG(Typ) + 0.3V] to 5.5V is

recommended. Bypass to VSS with a minimum of

4.7 µF.

3.3

Battery Management 0V Reference

(VSS1, VSS2, VSS3)

Connect to negative terminal of battery.

3.4

Current Regulation Set (PROG)

Preconditioning, fast and termination currents are

scaled by placing a resistor from PROG to VSS.

3.5

Cell Temperature Sensor Bias

(THREF)

THREF is a voltage reference to bias external

thermistor for continuous cell temperature monitoring

and pre-qualification.

3.6

Cell Temperature Sensor Input

(THERM)

Input for an external thermistor for continuous cell-

temperature monitoring and prequalification. Connect

to THREF/3 to disable temperature sensing.

3.7

Timer Set (TIMER)

All safety timers are scaled by CTIMER/0.1 µF.

3.8

Battery Charge Control Output

(VBAT1, VBAT2)

Connect to positive terminal of battery. Drain terminal

of internal P-channel MOSFET pass transistor. Bypass

to VSS with a minimum of 4.7 µF to ensure loop stability

when the battery is disconnected.

3.9

Battery Voltage Sense (VBAT3)

Voltage sense input. Connect to positive terminal of

battery. A precision internal resistor divider regulates

the final voltage on this pin to VREG.

3.10

Logic Enable (EN)

Input to force charge termination, initiate charge, clear

faults or disable automatic recharge.

3.11

Fault Status Output (STAT2)

Current-limited, open-drain drive for direct connection

to a LED for charge status indication. Alternatively, a

pull-up resistor can be applied for interfacing to a host

microcontroller.

3.12

Charge Status Output (STAT1)

Current-limited, open-drain drive for direct connection

to a LED for charge status indication. Alternatively, a

pull-up resistor can be applied for interfacing to a host

microcontroller.

MCP73853

MCP73855

Sym

Description

VSET

Voltage Regulation Selection

VDD1

Battery Management Input Supply

3—

VDD2

Battery Management Input Supply

VSS1

Battery Management 0V Reference

PROG

Current Regulation Set

—

THREF

Cell Temperature Sensor Bias

—

THERM

Cell Temperature Sensor Input

TIMER

Timer Set

9—

VSS3

Battery Management 0V Reference

VBAT1

Battery Charge Control Output

VBAT2

Battery Charge Control Output

—

VBAT3

Battery Voltage Sense

VSS2

Battery Management 0V Reference

Logic Enable

—

STAT2

Fault Status Output

STAT1

Charge Status Output

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