Siemens C55 Repair Documentation

V1.20 Page 28 of 48 ICM MP CCQ GRM
A55/C55_Hitachi Company Confidential © Copyright Siemens AG 04/03
6.1.2 Power Supply Operating modes:
The ASIC can be used in different operating modes:
Mode
Pin
Requirements
Description
Power down
mode with
minimum activity
ON/OFF
ON/OFF2
VDD_CHARGE
In power down mode the current consumption
of the ASIC is very low. The inputs for switch
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 Mode ON_OFF
ON_OFF2
Start Up Mode can be initiated by
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 ASIC is shut down.
Full operating
mode
VDD_CHARGE
CHARGE_UC
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 RESET2_N (PinG1)
signal. This will allow the µC(EGOLD+) to start
working.
Active Mode
(submode of Full
operating mode)
In this mode, the µC(EGOLD+) controls the
charging block and most of the failure cases.
The ASIC can be controlled by the TWI
interface (I2CC-PinJ2, I2CD-PinG3, I2CI-
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 ASIC will be
switched off immediately. The mono and stereo
audio block can be switched on in active mode.
Sleep Mode with
special low
current operating
mode for the
LDOs
(submode of Full
operating mode)
SLEEP1_N
TC_ON
CHARGE_uC
A low level at the signal VCOEN_UC (PinH1)
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 VDD_CHARGE (PinC3) with the
internal LDO is switched off. Only the battery
can be used for supply. This mode is called
“phone stand-by”.

Siemens C55 Specifications

General

Brand	Siemens
Model	C55
Category	Cell Phone
Language	English