Motorola V820, Service Manual

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Theory of Operation
V810
2003 Motorola Confidential Proprietary Page 20
Supports low-power, low-frequency crystal to enable
TCXO shutoff
Low Vdc power consumption during operation
Software-controlled power management features
ANSI/IEEE 1149.1A-93 compliant JTAG interface for
Testability
Enhanced I/O support for faster RS-232
Supports page-mode flash memory
PM6000
The PM6000 chip (IC304) is a complete power management
system device for CDMA handset applications whose primary
functions provide battery management and charger control, and
linear voltage regulation with programmable voltages for
digital and RF/analog circuits. PM6000 IC contain the
following features:
7 LDOs
Serial Interface (SBI bus) to MSM
TCXO control for Slotted mode operation
Charging control for Li-Ion battery
Ten 10-bit A to D converters (5 wired internally, 5
accessible)
Keyboard/LCD backlight driver (not used)
Ringer driver (not used)
Vibrator driver (not used)
MSM/32.768KHz clock driver
Power On Reset control
FLASH/PSRAM Memory
IC309 Flash/PSRAM (Pseudo SRAM) Memory is mixed multi-chip
package containing two 64Mbit Flash memories and one 64Mbit
pseudo SRAM. The Flash/PSRAM Memory supports page mode for
fast access time. Flash is for boot code, program code storage and
NVM data storage. FLASH memory contains executable code that is
executed directly from FLASH. Flash memory also contains
configuration parameters, look-up tables, calibration constants, user
selectable option settings, phonebook data, call history, etc. Pseudo
SRAM contains run-time dynamic data storage, software stack/heap
data, and other data that is frequently modified during run-time
operation. The Baseband Processor accesses FLASH/PSRAM
memory via a 16-bit asynchronous bus interface.
Accessory Interface
A 17 pin accessory connector (CN300), called as CE bus connector is
provided at the bottom of the main housing. This interface supports
charging accessories, analog and digital audio accessories, and RS-
232 and USB communication accessories. The accessory interface
provides for auto-detection of accessories upon insertion. Depending
on the
accessory, power can be provided to the phone from an external
approved power accessory or power can be provided to the accessory
for battery powered applications.