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Power Supply Concept - Siemens S6 GSM Service Manual

Private communication systems mobile phones.
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The antenna switch is mechanical, whenever you plug in the bottom connector, the
handset will switch to its external antenna.

5.3 Power Supply Concept

The S6 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)
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 S6 Power Supply
+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 are derived,
controlled by the power supply ASIC.
The RF module needs 6.4 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.
V1.3
VDD
Control
Control
S6 GSM/PCN
Power Supply
ASIC
Power Detection
Charging On
(to P)
(from P)
14
Private Communication Systems
Mobile Phones
Switching
Regulator
Linear
Regulator
+6.4 V
RF Supply
+2.8 V
Logic Supply
SIM Supply
RESET
PN MP ST
D. Schnoor
10/97

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