Sharp Actius PC-GP20 Betriebsanweisung PDF herunterladen (Seite 48)

4-20 Intel

StrongARM

SA-1110 Microprocessor Development Board

User’s Guide

Hardware Considerations

Note: The nine-pin RS232 cable connected to the Base Station serial port (J10) on the SA-1110

Development Board cannot be connected at the same time as the UART1 connector on the

SA-1111 Development Module. Failure to do so will corrupt the data on the UART1.

4.10 Power System

The SA-1110 development system has a unique, highly efficient and cost effective battery power

system.

4.10.1 Power System Design Benefits

The SA-1110 Development Platform provides the following benefits:

• Requires only a single cell Li-ion 3.6 V battery

• Greater then 90% efficiency on 3.3 V, 1.5 Vcore, and radio power rails in operating mode

• Greater then 90% efficiency on 3.3V rail in sleep mode

• Supports high power, high efficiency radio power rail for radio modules requiring either two

cell Li-ion batteries providing 7.2 V power or a single cell Li-ion battery providing 3.6 V

power

• Control of pulse width modulation (PWM) or pulse frequency modulation (PFM) and power

switching synchronization modes of main switching regulators

• Very clean power rails for audio and LCD systems

• Allows charging from AC power adapter or USB power input using a Maxim MAX846*

Li-ion charge controller

• Provides battery temperature monitoring

• Provides battery voltage and charger voltage monitoring

• Provides automatic battery lockout to prevent over-discharge and possible battery damage

• Provides low battery interrupt to SA-1110 processor

• Provides power switches for Compact Flash socket, audio subsystem and LCD display

subsystems

4.10.2 Power System Design

There are two main power rails in any SA-1110 design; are the 3.3 V main power and the

1.5 V core power. The 3.3 V rail must be on all the time to support sleep mode and preserve

SDRAM contents and system timer. In addition, a medium power 5 V rail is needed for the LCD as

well as a 7.6 V (two Li-ion cell equivalent) high power rail for the CDMA radio module.

As shown in Figure 4-1, the battery charge and discharge rates are quoted in relative terms related

to the rated capacity of the battery. As an example, a 1000 mA hour battery may be discharged at a

2 C rate where C is the rated battery current or 1000 mA in this example. A 0.2 C rate would be

200 mA for a 1000mAh battery. A Li-ion battery with a 100% charge starts at a terminal voltage of

4. 1 V and quickly discharges to about 3.6 V where it remains for most of the discharge cycle.

Toward the end of the discharge cycle the Li-ion terminal voltage falls rapidly from 3.6 V to 2.7 V

where the discharge must be stopped or battery damage (loss of capacity) may result. Two Li-ion

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