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Power Supply Operating Modes - Siemens A55 Repair Documentation

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6.1.1 Power Supply Operating modes:

The
ASIC
can be used in different operating modes:
Pin
Mode
Requirements
Power down
ON/OFF
mode with
ON/OFF2
minimum activity
VDD_CHARGE
Start Up Mode
ON_OFF
ON_OFF2
Full operating
VDD_CHARGE
mode
CHARGE_UC
Active Mode
(submode of Full
operating mode)
Sleep Mode with
SLEEP1_N
special low
TC_ON
current operating
CHARGE_uC
mode for the
LDOs
(submode of Full
operating mode)
V 1.10
A52/A55/C55 IFX
Description
In power down mode the current consumption
of the
ASIC
on conditions (ON/OFF-PinH2, ON/OFF2-PinJ3
,VDD_CHARGE-PinC3), the LPREG, Bandgap
reference and the POR cells are active. All
other blocks are switched off, so the battery is
not discharged. This state is called "phone off.
Start
Up
ON_OFF(PinH2) or ON_OFF2(PinC3). In this
mode a sequential start-up of references,
oscillator, voltage supervision and regulators is
controlled by digital part. In failure case (under
voltage, over voltage or time out of the µC
reaction)., the
All blocks are active. Trickle charge is switched
off. The blocks fast charge and charge monitor
can be active only in this mode. These modes
will be activated with VDD_CHARGE(PinC3) or
CHARGE_UC(PinH4). The name of this mode
is "phone on" or "active mode". The border
between the startup phase and the active mode
is the rising edge of the
signal. This will allow the µC(EGOLD+) to start
working.
In this mode, the µC(EGOLD+) controls the
charging block and most of the failure cases.
The
ASIC
interface
PinE2), interrupts can be sent by the ASIC.
Further, the temperature and the voltages are
supervised (in case of failure, the uC will be
informed). In case of watchdog failure, over
voltage or power on reset, the
switched off immediately. The mono and stereo
audio block can be switched on in active mode.
A low level at the signal
will switch the phone from the mode "PHONE
ON" to sleep mode. This mode can be
activated out of the active mode. In sleep mode
trickle charge, fast charge, supply over voltage
detection, supply under voltage detection,
audio function are switched off. LDO under
voltage detection, clock and all reference
voltages are active. LDOs are working in low
current mode. The possibility to supply the
ASIC
from
internal LDO is switched off. Only the battery
can be used for supply. This mode is called
"phone stand-by".
Page 25of 45
Company Confidential © Copyright Siemens AG
is very low. The inputs for switch
Mode
can
be
ASIC
is shut down.
RESET2_N
can be controlled by the TWI
(I2CC-PinJ2,
I2CD-PinG3,
ASIC
VCOEN_UC
VDD_CHARGE
(PinC3) with the
initiated
by
(PinG1)
I2CI-
will be
(PinH1)
ICM MP CCQ GRM
08/03

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