MAS9011A1BD08 MAS [Micro Analog systems], MAS9011A1BD08 Datasheet - Page 3

• Manufacturer Part Number: MAS9011A1BD08
• Description: Solar Cell System Manager
• Manufacturer: MAS [Micro Analog systems]

FUNCTIONAL DESCRIPTION
The solar manager generates three signals: PO
(Power On), LB (Low Battery) and SOL (Full
Battery).
These signals are produced by three comparators
which have hysteresis build in. Each comparator
compares supply voltage (VDD) to
switching levels (see Electrical Characteristics on
next page). The current consumption of the
comparators is very low. The electrical parameters
are described more detailed in the Electrical
Characteristics chapter.
PO signal can be used to stop the whole system
whenever the power supply level has dropped low
enough. When power supply voltage is too low, the
PO
microcontroller to go power down.
goes
high
to
give
signal
to
internal
watch
LB signal indicates that the battery is low but not
empty. LB goes high when power supply level is too
low.
SOL is used for battery charging control of the solar
watch. When power supply voltage goes high
enough, the internal PMOS switch between VDD
and SOL pins is switched on to shunt the solar cell
charging
overcharging.
In operation without an external Schottky diode
between the pins SOL and GND, the voltage at pin
SOL is clamped to about 700 mV below GND by a
diode-connected PNP transistor.
MAS9011 does not have any control pin. After the
power supply is connected the device is ready to be
used.
current
and
to
prevent
DA9011.001
28 Jan 2004
battery
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