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Functions
Pin
Requirements
Voltage Supply
VREGA
Audio
Voltage Supply
VLPREG
RTC
Voltage Supply
VREGSIM
SIM
Charge Support
CHARGE_UC,
CHARGE,
VDDCHARGE,
AVDD,
SENSE_IN,
TBAT
Voltage
supervision
V1.20
A55/C55_Hitachi
Sequence
The linear controller is designed for 2.9V(min.
2.84V, max. 2.96V) and a maximum load
current of 190 mA.
BATT+
analog supply. The DAC digital
(PinC6), Low Noise Bandgap, Mono- and
Stereoamplifier supplies are connected to
VREGA
guaranteed only, if the
stereo path.
VREGA
by the µC.
The linear controller is designed for 2.00V(min.
1.9V, max. 2.1V) and a maximum load current
of 1 mA.
The output voltage can be adjusted to four
different values with TWI register by the µC.
The selectable values are 2.00(default), 1.82,
1.92 and 2.07V. LP-LDO is always working and
will switch of only with POR signal.
The linear controller is designed for 2.9V(min.
2.84V, max. 2.96V) and a maximum load
current of 60 mA. The output voltage can be
adjusted to a different value with TWI register
by the µC to 1.8V(min. 1.76V, max. 1.84V).
This regulator can be activated by TWI register
, but only in active mode. If the regulator is in
power down, the output is pulled down by a
transistor to avoid electrostatic charging of
VREGSIM
A charge support will be integrated for
controlling the battery charge function. It
consists basically of a temperature sensor, an
external charge FET, an integrated High-side
driver for the external FET with an external
resistor between the source and the gate of the
charge FET.
In
the
CHARGE_UC(PinH4) the power source will be
switched on. In this way the charge FET
becomes
integrated temperature comparator does not
give the signal for extreme temperature and
that no over voltage is present at the VDD. In
the
case
CHARGE_UC(PinH4), the current source is
switched off and the pull-up resistor will make
sure that the charge FET is blocked after a
definite time.
Temperature switchoff becomes effective at
approx. T>60°C.
The levels of regulator REG1 and REG2 and
also the supply voltage
with comparators.
Page 32 of 48
Company Confidential © Copyright Siemens AG
(PinA9) is used for the whole stereo
(PinB9). The AUDIO performances are
VREGA
is controlled with TWI registers directly
(PinB8)
case
of
a
rising
conducting,
provided
of
falling
slope
BATT+
VDDDAC
supplies all the
edge
at
the
that
the
at
the
are supervised
ICM MP CCQ GRM
04/03
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