NEC Confidential & Proprietary
HAWK IC501
Hawk is a power supply and peripherals interface IC. It performs most of the
power supply requirements of the application portion of HHP. The device consists of 11
voltage regulators and is supplied directly from battery. There is a Voltage detector inside
Hawk to monitor the Voltage of battery. If the voltage of the battery is lower than 2.9V. A
reset signal will be sent from Hawk to Helen 1, and all the internal regulators will be
turned off as well. Then the HHP is going to power off automatically.
The Hawk performs the following functions :
Supply power for the application portion
Hawk provides the following outputs :
V21
2.85V : supply for Peripherals, Flash I/O and Com I/O of Helen 1,
Flash ROM, MA-3D (Melody IC) and Hall IC (Fold detect IC).
V25
1.85V : supply for SDRAM I/O of Helen 1 and SDRAM.
V28
2.85V : supply for Main LCD, SUB LCD, Warbler 2, Camera and
Papaya
V29
1.5V : supply for Core of Helen 1
V33
2.85V : supply for IrDA
MICBIAS
2.2V : Supply for the bias of microphone
JACKBIAS
2.2V : Supply for Simple handsfree Jack
V43
2.9V : supply for audio amplifiers
VIBD
3.0V : supply for Vibrator
VUSB
3.3V : supply for USB I/O of Helen 1
Receiver amplifier
Microphone amplifier
Melody ring tune amplifier
Key backlight control
Vibrator control
Battery charge and management
Back up Battery charge
Real time clock
Fold detection via Hall IC
Head set interface
Summary of Contents for N8
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Page 3: ...NEC Confidential Proprietary Next Section Main Menu Section 1 Precautions for Repair Work 1 ...
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Page 29: ...NEC Confidential Proprietary KEY SHEET ASSEMBLY ...
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