PS200-I/SO データシートの表示（PDF） - Microchip Technology

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PS200-I/SO

PowerSmart® Configurable Battery Charger

Microchip Technology 

2.3 KEELOQ® Algorithm

The PS200 includes Microchip’s KEELOQ decoder

algorithm. The KEELOQ code hopping technology is a

worldwide standard providing a simple, yet highly

secure, solution for authentication. Microchip’s battery

management products include the KEELOQ algorithm to

provide secure identification for rechargeable batteries.

When the KEELOQ algorithm is enabled, the PS200 will

issue a 32-bit challenge to the attached rechargeable

battery. The battery, which also includes the KEELOQ

decoder algorithm, will generate a response. See

Microchip application note AN827 “Using KEELOQ® to

Validate Subsystem Compatibility” (DS00827) for

details on implementing a complete KEELOQ battery

authentication system.

2.4 Lithium Configurable Parameters

The PS200 device’s configurable parameters allow for

flexible changes in designing battery chargers. The

parameters are categorized as follows:

• Configuration

• Charging Limits

- Precharge

- Current Regulation

- Voltage Regulation

• LED Display Configuration

Please refer to Table 2-1 “PS200 Lithium Configurable

Parameters”.

2.4.1 CONFIGURATION PARAMETERS

The configuration parameters provide an identity to the

battery pack and provide its basic characteristics to the

PS200.

2.4.2 CHARGING LIMITS

2.4.2.1 Precharge Parameters

The Precharge parameters configure the charger’s

operation during this initial battery charging phase.

PS200

2.4.2.2 Current Regulation Parameters

The Current Regulation parameters configure the

charger’s operation during this second battery charging

phase.

2.4.2.3 Voltage Regulation Parameters

The Voltage Regulation parameters configure the

charger’s operation during this third battery charging

phase.

2.4.3 LED DISPLAY CONFIGURATION

The PS200 supports a two-LED charging state display.

These LEDs can be configured to identify seven unique

charger states:

• Charge Pending – charger is waiting for battery

pack that needs charge.

• Charge Qualification – charger is determining if

the battery pack can be safely charged.

• Precharge – charger is charging the battery pack

under the conditions configured for precharge.

• Charge Suspend – charger has temporarily

suspended charging the battery pack. This state

is usually entered as a result of violating a

maximum temperature requirement. Charging will

resume when conditions are within required

charging parameter values.

• Current Regulation – charger is charging the

battery pack with a constant current.

• Voltage Regulation – charger is charging the

battery pack at the constant target voltage.

• Charge Complete – charger has completed

charging the battery pack.

© 2005 Microchip Technology Inc.

DS21891B-page 9

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