Baseband Description; Functional Description; Upp; Memory - Nokia 2760 Service Manual

RM-258; RM-259
System Module

Baseband description

Functional description

The BB core is based on UPP8M CPU. UPP8M takes care of all the signal processing and operation controlling
tasks of the mobile device. For power management, there is one main ASIC for controlling charging and
supplying power UEMCLite plus a discrete power supply. The main reset for the system is generated by the
UEMCLite. The memory comprises of 128 Mbit flash and 16 Mbit PsRAM. memory devices that are stacked on
top of each other in a single Combo package.
The interface to the RF and audio sections is also handled by the UEMCLite. This ASIC provides A/D and D/A
conversion of the in-phase and quadrature receive and transmit signal paths and also A/D and D/A conversions
of received and transmitted audio signals. Data transmission between UEMCLite and RF and the UPP8M is
implemented using different serial connections (CBUS, DBUS and RFBUS). Digital speech processing is handled
by UPP8M ASIC.
A real time clock function is integrated into UEMCLite, which utilizes the same 32 kHz-clock source as the
sleep clock. The SLCK/RTC runs all time when the phone battery is connected. It is running also when the
phone is switched off. In UEMCLite there is no back up battery/capacitor connection.
There are three audio transducers in the product; 16 mm speaker, an earpiece and a microphone. The earpiece
is used to generate audios for earpiece; the speaker is used to generate audios for IHF and ringing tones. A
separate audio amplifier drives the speaker. There is only one microphone for both HS and IHF modes.
The display is an TFT type color display with 65536 colors and 128 x 160 pixels with backlighting. The keypad
module features a function keymat with a 4-way navigation key with a center selection key.

UPP

UPP (Universal Phone Processor) is the digital ASIC of the DCT4 generation base band. UPP8M includes 4.5
MBit internal RAM, 16/32-bit RISC MCU core. UPP8Mv6.11 includes ARM7TDMI rev4 16/32-bit RISC MCU core, TI
Lead3 16-bit DSP phase2+ core with DMA controller, ROM for MCU boot code and all digital control logic.

Memory

This mobile uses two kinds of memories, Flash and Synchronous RAM (SRAM). These memories have are
sharing the same bus interface to UPP8M. SDRAM is used as the working memory. The SRAM size is 16 Mbits.
SRAM I/O is 1.8 V and core 1.8 V supplied by UEMCLite regulator VIO. All memory contents are lost if the supply
voltage is switched off.
Multiplexed flash memory interface is used to store the MCU program code and user data.
Configuration of flash memory is a 128 Mbit NOR flash memory. Flash I/O and core voltage are 1.8 V.

UEMCLite

The UEMCLite is a low cost energy management ASIC contains for BB use two 2.78V LDO regulators, 1.8V linear
regulator, programmable 1.0 - 1.5 V linear regulator and 1.8/3.0 V LDO regulator. For RF use UEMCLite has
five 2.78 V LDOs. In addition, the UEMCLite contains audio codec, A/D converters, RF converters, many drivers,
etc.

External regulators

White LED Driver solution is implemented with DC/DC converter. The driver circuit is controlled by UEM output
pin DLIGHT, which add external pull up using a digital transistor and one resistor. The schematics also
combined the UEMIO (5) to control DC/DC enable as another optional using two jumper.
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