PCF50603 Ver la hoja de datos (PDF) - Philips Electronics

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Fabricante

PCF50603

Controller for power supply and battery management

Philips Electronics 

Philips Semiconductors

Controller for power supply

and battery management

8.5.2 EXTERNAL COMPONENTS

A small discrete circuit must be used to control the charge current (see Fig.11).

Preliminary specification

PCF50603

handbook, halfpage

VCHG

CHGDRV

CHGCUR

BC869(1)

0.15 Ω Rsense

VBAT

MDB688

(1) The charge switch requires a current gain in the range of 50 to 400 for stable loop operation.

Fig.11 Charge current external circuitry.

8.6 Backup battery charger (BBC)

The BBC is implemented as a voltage limited current

source with a selectable output resistor. It offers the

following features:

• Selectable output resistor to reduce the current at higher

voltages

• Four programmable charge currents

• Two programmable maximum limiting voltages

• The BBC can be enabled in the ACTIVE state; in all

other states the BBC is disabled.

8.7 SIM card interface (SIMI)

The SIMI provides the facilities to communicate with SIM.

It offers the following features:

• Support for transparent mode. The host controller

controls the communication with the SIM card, including

the activation and deactivation sequences.

• Support for sequencer mode. The internal sequencer of

the PCF50603 performs the activation and deactivation

sequences.

• Includes a dedicated linear regulator for the SIM card

supply (SIMREG) supporting both 1.8 V and 3.0 V cards

• Provides level-shifters for the SIM interfacing signals.

The level-shifters translate the host controller signal

levels (IOVDD) to SIM card signal levels (SIMVCC) and

vice versa.

• In transparent mode the SIMEN input allows the host

controller to have direct control over the SIM card

supply. In sequencer mode the SIMEN input indicates

the presence of a SIM card.

• Enhanced ESD protection on all SIM contact pins

• The SIMI and SIMREG can be enabled in the ACTIVE

state. In all other states the SIMI and SIMREG are

disabled.

8.8 Battery voltage monitor (BVM)

The BVM monitors the main battery voltage. It offers the

following features:

• Programmable low battery threshold (VLOW_BAT)

• Hysteresis and selectable debounce filter built in to

prevent fast cycling

• The BVM is enabled in all activity states.

The BVM observes permanently the main battery voltage

and generates a LOWBAT interrupt if the battery voltage

drops below the programmed threshold voltage VLOW_BAT

(see Fig.12). When a LOWBAT interrupt is generated in

ACTIVE state, the host controller should initiate a

transition to STANDBY state. In case the host controller

does not initiate a transition to the STANDBY state within

eight seconds after the interrupt occurred, the OOC forces

the PCF50603 to the STANDBY state in order to prevent a

too deep discharge of the battery.

2003 Oct 31

17

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