Major Chips Description 2-91
2.9 T62.062.C Battery Charger
2.9.1 Overview
Ambit T62.062.C.00 charger is designed exclusively for TI Extensa 610 notebook computer as a
power management and battery charger module which can charge a 9 cells Nickel-Metal Hydride
(NiMH) or 9 cells with 3’s parallel and 3’s serial Lithium Ion(LIB) Battery pack. When charging the
NiMH battery , the determination of the battery full capacity for the charger is based on zero delta
Voltage (0 V), temperature increment gradient (T/t), minus delta voltage (-V) and maximum
voltage (Max. V). On the other hand, if charging the LIB battery, constant current and constant
voltage the typical LIB battery charging mode will be applied precisely. It is important to notice that
every battery pack to be used must have a built-in 103AT-2 NTC thermistor (maximum 70thermal
breaker included for NiMH battery). Otherwise, most of the charger functions so as to be failed.
The charger permits a soft charging of NiMH battery to full capacity whereas over-charging is well
protected. Fast charge begins with the application of the external AC adapter or the replacement
of a new plugged in battery whichever NiMH or LIB battery. For safety, at the beginning of
charging, battery will not be charged until its temperature within a certain interval and if start
voltage is lower than another certain value, the charger module provides trickle charge current to
charge the battery which prevents fast charging could possibly damage the battery. In addition,
maximum temperature protection and safe timer is provided during quick charge. To maintain the
capacity once the NiMH reaches full energy level, trickle charge current will be continuously
provided to the battery by the charger.
2.9.2 Features
• Designed for charging a 9 cells Nickle-Metal Hydride Battery pack or 9 cells (3 parallel,
3 serial) Lithium- Ion Battery pack
• Providing the basic power management for the main system
• System off time selectable : 50mS (software) / 2.5S (hardware)
• Providing charging function whenever system in use power or not
• Providing battery protections by constantly monitoring temperature, voltage and charging
time
• Compact size & low cost
• Determination of a NiMH battery full capacity against over-charging based on
• 0 ∆V (disabled when system sharing the power with the charger during charging)
• - ∆V (disabled when system sharing the power with the charger during charging)
• ∆T/∆t ( 3oc/3min )
• Max. V ( charge NiMH:16.2v )
• Charging LIB battery following the constant current then constant voltage mode
• Providing battery safety protections by:
• Trickle current when battery voltage being very low