FS8601HD datasheet(9/15 Pages) FORTUNE

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FS8601Hx

11. Description of Operation

Normal Condition

If VODL<VCC<VOCU and VST<VCS<VOI1, M1 and

M2 are both turned on. The charging and

discharging processes can be operated normally.

Overcharge Protection

When the voltage of the battery cell exceeds the

overcharge detection voltage (VOCU) beyond the

overcharge delay time (TOC) period, charging is

inhibited by turning off of the charge control

MOSFET. The overcharge condition is released in

two cases:

The voltage of the battery cell becomes lower than

the overcharge release voltage (VOCR) through

self-discharge.

The voltage of the battery cell falls below the

overcharge detection voltage (VOCU) and a load is

connected.

When the battery voltage is above VOCU, the

overcharge condition will not release even a load is

connected to the pack.

Overdischarge Protection

When the voltage of the battery cell goes below the

overdischarge detection voltage (VODL) beyond the

overdischarge delay time (TOD) period, discharging

is inhibited by turning off the discharge control

MOSFET.

The default of overdischarge delay time is 100ms.

Inhibition of discharging is immediately released

when the voltage of the battery cell becomes higher

than overdischarge release voltage (VODR) through

charging.

Overcurrent Protection

In normal mode, the FS8601HX continuously

monitors the discharge current by sensing the

voltage of CS pin. If the voltage of CS pin exceeds

the overcurrent detection voltage (VOI1) beyond the

overcurrent delay time (TOI1) period, the overcurrent

protection circuit operates and discharging is

inhibited by turning off the discharge control

MOSFET. The overcurrent condition returns to the

normal mode when the load is released or the

impedance between BATT+ and BATT- is larger than

150kΩ. The FS8601HX provides two overcurrent

detection levels (0.13V and 0.7V or 0.9V) with two

overcurrent

delay

time

(TOI1

and

TOI2)

corresponding to each overcurrent detection level.

Charge Detection after Overdischarge

When overdischarge occurs, the discharge control

MOSFET turns off and discharging is inhibited.

However, charging is still permitted through the

parasitic diode of MOSFET. Once the charger is

connected to the battery pack, the FS8601HX

immediately turns on all the timing generation and

detection circuitry. Charging progress is sensed if

the voltage between CS and GND is below charge

detection threshold voltage.

Power Down after Overdischarge

When overdischarge occurs, the FS8601HX will

enter into power-down mode, turning off all the

timing generation and detection circuitry to reduce

the quiescent current to 1.0μA (VCC=2.0V). At the

same time, the CS pin is pull-up to VCC through an

internal resistor.

Supervising charger voltage

By supervising the charge voltage, charging can be

prohibited instantly when a charger with overvoltage

is connevted. The charger voltage detection circuit

supervises the voltage between the VDD and CSI

pins. When this voltage exceeds Vdet(Vdet <

(VDD – VCSI)),regardless of the battery voltage,the

charge FET control pin output alow level(CSI

level)signal and the charge FET is turned off. When

the charger voltage drops to Vrec or lower, the

charger FET control output level is dependent on

battery voltage.

Note: When a battery is connected to FS8601HX

for the first time, it may not enter the normal

condition (dischargeable may not be enabled). In

this case, short the CS and VSS pins or connect

to a charger to restore to the normal condition

Rev. 1.3

9/15

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