PCF50603 データシートの表示（PDF） - Philips Electronics

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PCF50603

Controller for power supply and battery management

Philips Electronics 

Philips Semiconductors

Controller for power supply

and battery management

8 FUNCTIONAL DESCRIPTION

8.1 On/off control

8.1.1 OPERATING STATES

The PCF50603 has four operating states (see Fig.3):

• NOPOWER

• SAVE

• STANDBY

• ACTIVE.

Preliminary specification

PCF50603

handbook, full pagewidth

SAVE

VBAT < VVERY_LOW_BAT

AND

VSAVE > VVERY_LOW_BACK

OR

VCHG > VVERY_LOW_BAT

NOPOWER

VBAT < VVERY_LOW_BAT

AND

VSAVE < VVERY_LOW_BACK

AND

VCHG < VVERY_LOW_BAT

STANDBY

VBAT > VVERY_LOW_BAT

ACTIVE

VBAT > VLOW_BAT

MDB681

Fig.3 State diagram.

8.1.2 RESET GENERATION

The OOC generates an internal and an external reset each

time the system goes from STANDBY to ACTIVE state. All

registers for the regulators and converters are reset to their

default values.

The RSTHC_N is kept LOW for minimum 10 ms after

entering the ACTIVE state. If the IOREG supply is

switched off, RSTHC_N becomes LOW again (see Fig.4).

A special condition occurs when the main battery voltage

drops below the VVERY_LOW_BAT limit of typically 2.7 V; the

RSTHC_N is asserted in order to shut down the host

controller immediately (see Fig.5).

2003 Oct 31

10

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