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The LTC1760 automatically switches between power sources in less than 10μs to prevent power
interruption upon battery or wall adapter removal. It implements all elements of a version 1.1 "Smart
Battery System Manager" except for the generation of composite battery information. An internal
multiplexer cleanly switches the SMBus Host to the attached Smart Battery without generating partial
messages to the battery or SMBus host. The Thermistor on the battery is automatically monitored for
temperature and disconnection information (SafetySignal).
Hardware programmable limits for maximum charge current and voltage improve the safety of the
complete system. For more information see datasheet of LTC1760.
LOPWR TRIP
®
The threshold voltage controls the voltage which source the system. When the
voltage of the active source drops below this threshold, then the currently best
voltage source is selected. This threshold voltage is configured to 5,95 V.
VLIMIT
®
The maximum charging voltage is configured to 8,4 V. This limit provides a measure
of safety with a hardware restriction and charging voltage, which cannot be
overridden by software. This voltage sets the limit that will be applied to the battery
as reported by battery.
ILIMIT
®
The maximum charging current is configured to 2 A. This limit was set to decrease the
charger hardware.
8.4
Dual Buck Converter
The dual buck converter is used, to generate 5 V and 3,3 V, to source the system. On the ePDAnano
Baseboard the LTC3850 is used for this function. The 5 V path provides a maximum current of 6 A and the
3,3 V path a maximum of 3 A.
Kontron User's Guide nanoETXexpress-HMI
Baseboard (ePDAnano)
8 Smart Battery system and dual buck converter
31
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