A920:
PCAP
Description
The Platform Control Audio Power IC (PCAP), U3000, is a mixed signal IC that contains the following features:
·
Audio input/output amplification and filtering
·
Audio path selection
·
Voltage regulation
·
Battery charging control
·
Real time clock
·
Ringer/vibrator control
·
RS-232/USB drivers
·
Back-light control
·
Status LED control
·
Multiplexed DAC inputs for temperature and voltage monitoring
·
Dual SPI control interface to allow access from two independent baseband processors
·
Stereo DAC
·
Overvoltage protection
·
Touch Screen
The PCAP IC is controlled and configured by the Baseband Processor IC through a four-wire SPI interface. The Baseband Processor has read/write access to the PCAP
IC. Audio data is transmitted/received via the Baseband Processor through a four-wire SSI interface.
Motor
o
la
Conf
ide
n
tia
l Pr
opr
ie
ta
ry
4-
40
Baseband
Circuits
RF Interface
Logic Interface
Regulator
Interface
Backlight
Status
LEDs
Linear
Regulators
Control
Logic
Switching
Regulator
LED
Drive
Backlight
Control
Helen
Power Cut
Power Fail
Handling
XTAL
Coin Cell
Interface
Speaker Ckts
Mic Ckts
Charger
Logic
Interface
POG
SPI
Interface
Charger
Control
Multiplexer
Audio
Amplifiers
USB
RS232
Bus
CODEC
A/D
SSI
Interface
Overvoltage
Protection
CE Bus
Helen
Headset
Stereo Detect
USB
On-the-Go
CE Bus
POG
Helen
Bluetooth
U3000
Display
Touch
Screen
Interface