MCP73855-I/MF【PDF 14/28 页】IC CONTROLLER LI-ION 4.5V 10DFN

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MCP73853/55

5.1.6

BATTERY VOLTAGE SENSE (V BAT3 )

TABLE 5-2:

STATUS OUTPUT – MCP73855

The MCP73853 monitors the battery voltage at the

V BAT3 pin. This input is tied directly to the positive

terminal of the battery pack.

CHARGE CYCLE STATE

Qualification

Preconditioning

STAT1

OFF

ON

5.1.7

BATTERY CHARGE CONTROL

OUTPUT (V BAT1 , V BAT2 )

Constant Current Fast Charge

Constant Voltage

ON

ON

The battery charge control output is the drain terminal of

an internal P-channel MOSFET. The MCP7385X

devices provide constant-current and constant-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.

Charge Complete

Fault

THERM Invalid

Disabled - Sleep mode

OFF

Flashing (1Hz,

50% duty cycle)

Flashing (1Hz,

50% duty cycle)

OFF

5.2

5.2.1

Digital Circuitry

CHARGE STATUS OUTPUTS

(STAT1,STAT2)

Input Voltage Disconnected OFF

Note: OFF state: open-drain is high impedance;

ON state: open-drain can sink current, typ-

ically 7 mA; FLASHING: toggles between

OFF state and ON state.

Two status outputs provide information on the state of

charge for the MCP73853. One status output provides

information on the state of charge for the MCP73855.

The current-limited, open-drain outputs can be used to

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

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

value of the timer capacitor.

illuminate external LEDs. Optionally, a pull-up resistor

can be used on the output for communication with a

5.2.1.1

MCP73853 Only

host microcontroller. Table 5-1 and Table 5-2 summa-

rize the state of the status outputs during a charge

cycle for the MCP73853 and MCP73855, respectively.

TABLE 5-1: STATUS OUTPUTS – MCP73853

CHARGE

STAT1 STAT2

CYCLE STATE

STAT2 is on whenever the input voltage is above the

under voltage lockout, the device is enabled, and all

conditions are normal.

During a fault condition, the STAT1 status output will be

off and the STAT2 status output will flash. To recover

from a fault condition, the input voltage must be

removed and then reapplied, or the enable input, EN,

Qualification

Preconditioning

Constant-

current Fast

Charge

Constant-

voltage

Charge

OFF

ON

ON

ON

Flashing (1 Hz,

OFF

OFF

OFF

OFF

OFF

must be deasserted 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 either not start or

be suspended. However, the charge cycle is not termi-

nated, with recovery being automatic. The charge cycle

will resume (or start) once the THERM input is valid and

all other qualification parameters are met.

Complete

50% duty cycle)

5.2.2

V SET INPUT

Fault

THERM Invalid

Disabled -

Sleep mode

OFF

OFF

OFF

ON

Flashing (1 Hz,

50% duty cycle)

OFF

The V SET input selects the regulated output voltage of

the MCP7385X devices. With V SET tied to V SS , the

MCP7385X devices regulate to 4.1V. With V SET tied to

V DD , the MCP7385X devices regulate to 4.2V.

5.2.3

LOGIC ENABLE (EN)

Input Voltage OFF OFF

Disconnected

Note: OFF state: open-drain is high-impedance;

ON state: open-drain can sink current,

typically 7 mA; FLASHING: toggles

between OFF and ON states.

DS21915B-page 14

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

nate a charge anytime during the charge cycle, 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 0.28 μA, typically.

? 2004-2012 Microchip Technology Inc.

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