User`s guide
Intel
®
StrongARM
®
SA-1110 Microprocessor Development Board
User’s Guide
6-3
System Power Management
6.2.2 Smart Battery Management
The SA-1110 Development Board’s battery pack connector includes connections for SMBus smart
battery system. Smart battery chips and smart battery packs are attached to the SA-1110
Development Board’s battery pack connector.
Smart battery system software has also been developed using this interface. For more information
on smart battery systems, refer to Intel’s web site for developers.
6.2.3 Battery Physical Interface
The SA-1110 Development Board’s battery interface will be via the J4 pin header that provides the
following connections:
• Battery pack plus
• Battery pack minus
• Ground
• SMBus SDA or thermistor signal
• SMBus SCL or thermistor return
• Key pin
• SMBus Interrupt
The pack power header pins must be capable of up to 2 A of continuous current.
If the smart battery chips are not used, a thermistor must be attached to the Li-ion battery pack. The
thermistor shares the pins assigned to the SMBus signals. Zero ohm jumpers on the SA-1110
Development Board can configure the system for thermistor or SMBus usage.
6.2.4 Battery Capacity
Capacity is typically quoted at specific temperatures and discharge rates. High discharge rates and
low temperatures will result in drastically reduced battery capacity.
Charging and discharging rates are usually quoted as a factor times the rated capacity. As an
example, a fast battery charging rate may be quoted as 0.5C. If the capacity of a battery is
1000mAH then 0.5C would specify a 500 mA fast charge rate.
6.2.5 Battery Safety
Most high performance batteries exhibit very low internal resistance. Low internal resistance
permits very high discharge currents especially under short circuit conditions. Short circuit
conditions must be avoided as they could result in personal injury or fire.
Li-ion batteries present an added hazard due to the potentially explosive nature of lithium.
Overcharged and overheated Li-ion batteries can split and release lithium which reacts explosively
when exposed to water or moisture in the air.