Service manual

module which can give backlight in darkness environment. U9812 drives IR diodes
for communication link between PC and DragonBall. Alert circuit is also controlled
by DragonBall. Alert circuit is also controlled by DragonBall. Analog switches
provide multiple communication path control which give the serial port different link
under different use conditions. Refer to the PDA logic block diagram.
7. 3 Power Supplies
Global Control Audio Power II ( GCAP-II ) is a power and audio management IC. It
incorporates many of the functions of various different power and audio management
Ics into one platform. For power supplies, GCAP-II provides five programmable
linear regulators ( VSIM1, Ref, V1, V2, and V3 ) which give all voltages for the logic
IC’s and two Buck or Boost switching regulators ( PWM #1 and PWM #2 ).
Power Management
• PGM0,1,2 Hardware configuration
PGM0 and PGM1 alone determine the battery mode of GCAP-II. This is necessary
because the startup and shutdown voltages need to be available without processor
intervention. At power-up PGM2 alone determines the output of V3. If PGM2 is
connected to B+, V3 is 2.775V. If PGM2 is connected to ground, as in Taichi, V3 is
2.003V. No processor intervention is necessary.
• V2 Linear Regulator
V2 is a programmable linear regulator. It is programmed through the SPI bus to
outputs from 2.775V to 3.6V in 0.12V steps. For Taichi V2 is programmed to 2.775V.
The regulator is supplied by B+. This regulator is on whenevey the radio is turned on.
V2 is the supply for WhiteCap logic outputs, RAM FLASH, and display.
• V3 Linear Regulator
V3 is a programmable linear regulator with an output voltage which is determined by
PGM2 at power-up. It is either 2.008V if PGM2 is connected to ground or 2.775V if
PGM2 is connected to B+. After power-up V3 can be programmed through the SPI
bus to voltages from 1.8V to 2.8V in 0.13V steps.For Taichi V3 is programmed to
1.8V.The regulator is supplied by B+. V3 is the fupply for the WhiteCap core (does
not include logic output supply). For example, V3 supplies the ARM core, Clock
amplifier, DSP Core, and input logic. For RAM 2 Whitecap V3 is programmed to
1.8V.
• VSIM Regulator
VSIM is a programmable linear regulator. It is programmed through the SPI bus to
either 5.0V or 3.0V. For TaiChi VSM is programmed dynamically to 5.0V. VSIM is
spplied by V_BOOST1 and supplies the SIM card.
• V1 Regulator