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Power Supply - Siemens S6 Power Service Manual

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The S6 Power has two main power inputs (see Blockdiagram):
1) Battery Voltage (3.6 Volts) connected at the battery contacts
2) Charging Voltage (6.5 Volts) delivered by
a) The plug-in charger at the charging plug
b) The desktop charger using the charging contacts at the bottom of the phone
c) The car kit using the charging connection at the bottom connector
Since the battery voltage is supplying the power supply asic, it is always needed to
operate the phone. You cannot switch on the handset if the battery voltage is not
present.
Blockdiagram Power Supply
VCC_DD
0.25 A
+3.6 V
Batt+
+6.5 V
Power
1A
Ignition
Watchdog
ON_OFF Button
From the 3.6 V battery voltage, all other supply voltages of the S6 power are
derived, controlled by the power supply ASIC.
The VCC_DD voltage is used to supply external accessories through the bottom
connector.
The RF module needs 6.0 V for its PA, this voltage is generated by a step-up
converter.
The logic module uses 2.8 V, generated by a simple linear regulator.
Furthermore the ASIC generates the supply voltage for the SIM-Card and the
RESET signal for the logic devices.
V1.2
VDD
Control
Charging
Control
Control
S6 Power

Power Supply

ASIC
Power Detection
Charging On
(to µP)
(from µP)
Page 12 of 18
Private Communication Systems
Mobile Phones
Switching
Regulator
Linear
Regulator
+6.0 V
RF Supply
+2.8 V
Logic Supply
SIM Supply
RESET
PN MP ST
D. Schnoor
4/98

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