Intermec 073293-001 Manual De Usuario
Chapter 4 — Theory of Operation
The charging current is applied through the contacts on the base of the
battery; the 26-pin dock connector is not used for charging. See “AD1
Charging” on page 99 for details on the charging circuit in the dock.
battery; the 26-pin dock connector is not used for charging. See “AD1
Charging” on page 99 for details on the charging circuit in the dock.
Supercap
A 10-farad 2.5V supercap (C89) provides backup current to hold the
machine state while the main battery is being replaced. If the battery is
removed without first suspending the CK30, a fully charged supercap can
provide enough current to run the CK30 at full power for up to 1 second
as it suspends, and still maintain the machine state for up to 10 minutes
(at 25°C).
machine state while the main battery is being replaced. If the battery is
removed without first suspending the CK30, a fully charged supercap can
provide enough current to run the CK30 at full power for up to 1 second
as it suspends, and still maintain the machine state for up to 10 minutes
(at 25°C).
The supercap voltage is boosted to 3.2V by switching converter U44 and
routed to the main 3.3V bus. Switcher U44 is always on but draws very
little current as long as the main 3.3V supply (U39) exceeds U44 3.2V
output.
routed to the main 3.3V bus. Switcher U44 is always on but draws very
little current as long as the main 3.3V supply (U39) exceeds U44 3.2V
output.
While the CK30 is still on, signal PWR_EN* holds U44 MODE pin low
(constant frequency mode), increasing its efficiency under heavy load.
Once the system suspends, PWR_EN* goes high, selecting U44 burst
mode for higher efficiency under a light load.
(constant frequency mode), increasing its efficiency under heavy load.
Once the system suspends, PWR_EN* goes high, selecting U44 burst
mode for higher efficiency under a light load.
Supercap Charging
C89 is charged at a constant 2.5V through LDO U50. Power Supply
Controller U38 enables supercap charging as long as main battery voltage
is ≥ 5.1V.
Controller U38 enables supercap charging as long as main battery voltage
is ≥ 5.1V.
External Power
While the CK30 is docked in an AD1, AD2, or AC2, the dock provides
12V operating current through Pin 3 on the base of the battery. The
battery pack internal logic biases off the battery voltage, sending the Pin 3
voltage from the dock to the CK30 while the battery charges.
12V operating current through Pin 3 on the base of the battery. The
battery pack internal logic biases off the battery voltage, sending the Pin 3
voltage from the dock to the CK30 while the battery charges.
DC voltage applied to the CK30 must not exceed 15 VDC.
CK30 Handheld Computer Service Manual
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