Power Management - LG KG270 Service Manual

3. TECHNICAL BRIEF
3.1.12 C166 Debug Concept
The debugging of the C166 uses the OCDS and the Cerberus.
3.1.13 TEAKLite Debug Concept
TEAKlite debugging uses the OCEM and the SEIB.

3.1.14 Power Management

The E-GOLDvoice provides the power management unit (PMU) for the complete mobile phone
application. The integrated PMU is directly connected to the battery and provides a set of linear
voltage regulators (LDO's).
These LDO's generate all required supply voltages and currents needed in a low feature mobile
phone. A charger control circuit charges NiCd, NiMH and LiIon batteries.
The charger control supports hardware controlled pre-charging and software controlled charging. It
offers a wide charger voltage range, making halfwave/full-wave charging with cheap transformers
possible.
White/blue backlight generation is supported with a special driver for very a low external parts count.
Power consumption during operation phases is minimized due to flexible clock switching In the
Standby Mode most parts of the device are switched off, only a small part is running at 32kHz and the
controller RAM is switched to a power saving mode. The TEAKLite ROM can be switched off during
Standby via SW.
3.1.15 On-Chip Security Concept
Secure boot is based on a public/private key approach. Flash images that are not signed with the
private key during phone manufacture cannot be loaded.
Verification of the Flash code is done with the public key. The public key as well as hash and verify
algorithms are stored in the ROM, which ensures a hardware secured boot procedure.
The following security features are supported:
• Prevention of illegal Flash programming
• Flash programming makes use of the E-GOLDvoice ID for personalization checks with IMEI and
SIM-lock protection
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