MCP73864T-I/ML 查看數據表（PDF） - Microchip Technology

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MCP73864T-I/ML

Advanced Single or Dual Cell, Fully Integrated Li-Ion/Li-Polymer Charge Management Controllers

Microchip Technology 

MCP73861/2/3/4

During thermal regulation, the timer is slowed down

proportional to the charge current.

5.1.6

BATTERY VOLTAGE SENSE (VBAT3)

The MCP7386X monitors the battery voltage at the

VBAT3 pin. This input is tied directly to the positive

terminal of the battery pack.

5.1.7 BATTERY CHARGE CONTROL

OUTPUT (VBAT1, VBAT2)

The battery charge control output is the drain terminal

of an internal P-channel MOSFET. The MCP7386X

provides constant current and voltage regulation to the

battery pack by controlling this MOSFET in the linear

region. The battery charge control output should be

connected to the positive terminal of the battery pack.

5.2 Digital Circuitry

5.2.1

CHARGE STATUS OUTPUTS

(STAT1, STAT2)

Two status outputs provide information on the state of

charge. The current-limited, open-drain outputs can be

used to illuminate external LEDs. Optionally, a pull-up

resistor can be used on the output for communication

with a host microcontroller. Table 5-1 summarizes the

state of the status outputs during a charge cycle.

TABLE 5-1: STATUS OUTPUTS

CHARGE

CYCLE STAT1

STAT1

STAT2

Qualification

Off

Off

Preconditioning

On

Off

Constant-Current

On

Off

Fast Charge

Constant-Voltage

On

Off

Charge Complete Flashing (1 Hz,

50% duty cycle)

(MCP73861/2)

Off

(MCP73863/4)

Off

(All Devices)

Fault

Off

On

THERM Invalid

Off

Flashing (1 Hz

50% duty cycle)

Disabled – Sleep

Off

Off

mode

Input Voltage Dis-

Off

Off

connected

(1.5KΩ Pulldown)

Legend:

Off state: Open-drain is high-impedance

On state: Open-drain can sink current

typically 7 mA

Flashing: Toggles between off state and

on state

The flashing rate (1 Hz) is based off a timer capacitor

(CTIMER) of 0.1 µF. The rate will vary based on the

value of the timer capacitor.

During a Fault condition, the STAT1 status output will

be off and the STAT2 status output will be on. To

recover from a Fault condition, the input voltage must

be removed and then reapplied, or the enable input

(EN) must be de-asserted to a logic-low, then asserted

to a logic-high.

When the voltage on the THERM input is outside the

preset window, the charge cycle will not start, or will be

suspended. The charge cycle is not terminated and

recovery is automatic. The charge cycle will resume (or

start) once the THERM input is valid and all other

qualification parameters are met. During an invalid

THERM condition, the STAT1 status output will be off

and the STAT2 status output will flash.

5.2.2

VSET INPUT

The VSET input selects the regulated output voltage of

the MCP7386X. With VSET tied to VSS, the MCP73861/

3 and MCP73862/4 regulate to 4.1V and 8.2V, respec-

tively. With VSET tied to VDD, the MCP73861/3 and

MCP73862/4 regulate to 4.2V and 8.4V, respectively.

5.2.3 LOGIC ENABLE (EN)

The logic enable input pin (EN) can be used to termi-

nate a charge at any time during the charge cycle, as

well as to initiate a charge cycle or initiate a recharge

cycle.

Applying a logic-high input signal to the EN pin, or tying

it to the input source, enables the device. Applying a

logic-low input signal disables the device and termi-

nates a charge cycle. When disabled, the device’s

supply current is reduced to 0.17 µA, typically.

DS21893F-page 18

 2004-2013 Microchip Technology Inc.

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