TI 公司的TCS2315 GPRS手机解决方案是第三代基于GSM的超低成本手机，采用先进的65-nm工艺技术，在单片上集成了TMS320C54x™ DSP 和ARM7核以及数字RF DRP™ 技术，具有高性能以及强大的功能如GPRS功能，内置的VGA功能支持JPEG编译码和先进的图像功能如旋转和变焦等，用来在PC和手机间数据传输的USB连接以及蓝牙连接等，主要适合印度，中国，俄罗斯和巴西等国市场。本文介绍了TCS2315 GPRS手机解决方案的主要性能特点和指标以及方框图。

              TIs third-generation GSM-based solutions for the Ultra
              Low-Cost (ULC) Handsets
              Leveraging an advanced 65-nm process with TMS320C54x™
              DSP and ARM7 cores in the same package, the TCS2315 GPRS
              solution integrates TIs breakthrough digital RF DRP™
              technology to offer the most compelling user experience in
              Ultra Low-Cost (ULC) handsets. Part of the LoCosto ULC family,
              the TCS2315 enables handsets with high performance, robust
              functionality and innovative form factors in the most
              price-sensitive handsets. Ideal for emerging markets such as
              India, China, Russia and Brazil where the next billion
              subscribers will come from, the scalability and flexibility of
              the TCS2315 LoCosto ULC GPRS chipset also allow it to be
              deployed in enhanced handsets for value-conscious segments in
              more mature markets.

              Software portability from one generation of LoCosto solution
              to the next gives manufacturers and operators the ability to
              rapidly and cost-effectively differentiate handsets and
              service offerings for both emerging and mature markets,
              crossing over regional borders, language barriers and
              subscriber requirements.
              A set of enhanced capabilities are now possible in ULC
              handsets, such as a relatively high-resolution color display
              without requiring additional external SRAM, VGA camera
              support, MP3 playback and mass storage (SD/MMC), USB and
              Bluetooth® connectivity, high-end full duplex voice
              quality, a MIDI player with 32 polyphonics, MP3 and polyphonic
              ringers, longer talk time and standby time, stereo FM radio
              connectivity, USB charging, handsfree speakerphone operation,
              vibration ringer, headset support and other functionality.

              Equipped with TIs scalable and hardware-based M-Shield™
              security technology, a TCS2315 handset offers ironclad
              protection of the owners personal information. M-Shield also
              prevents the unlocking of the handsets SIMlock code, defeating
              attempts to switch networks. High-value content and IP can be
              fully protected from tampering, piracy and malicious attacks.

              Innovative user form factors such as ultra-slim, clamshell and
              candybar handsets are possible because of the reduced
              component count and PCB board space requirements brought about
              by the smaller 65-nm process node, increased integration, and
              advanced packaging technologies for a single-chip solution. In
              addition, a smaller PCB area requirement allows a handset to
              support larger batteries for a longer battery life enabling
              extended standby and talk times. The superb full-duplex
              quality of voice service of the
              “LoCosto ULC” solutions are comparable to more expensive
              handsets. In fact, the voice loudness on both ends of a call
              can be improved by 7 dB or practically twice as loud.
              Moreover, voice chopping and double talk are reduced
              dramatically, making handsets based on the TCS2305 and TCS2315
              solutions very effective in handsfree applications and noisy
              environments, characteristic of densely populated emerging
              markets. The TCS2305 and TCS2315 also offer SMS text
              messaging, a Universal Subscriber Identity
              Module (USIM) interface for SIM cards and support for a
              standard keypad and joy stick.

              Lowering the power dissipation in the advanced “LoCosto ULC”
              solutions extend the battery life of a handset, lengthening
              the standby and talk times for users. “LoCosto ULC”
              single-chip platform integrates power management functions for
              best-in-class power consumption levels and supports USB
              charging for universal and easy charger access. This
              eliminates the need to supply a charger with the phone (saving
              costs) and minimizes electronic waste from incompatible or
              obsolete chargers.
              Concerns over the security of wireless handsets are completely
              mitigated by TI is scalable and hardware-based M-Shield™
              technology. The “LoCosto ULC” solutions take advantage of
              M-Shield technology to safeguard not just the handset owner is
              sensitive personal information, but it also defeats malicious
              attempts to unlock the handset is SIMlock code. Cracking the
              SIMlock code can increase subscriber churn because users are
              able to switch a handset that had been locked to one network
              to another provider is network. To reduce phone theft and
              protect the service provider is investment in  subsidized
              handsets, TI is M-Shield technology secures the contents of
              flash memory,
              including boot code, and provides robust SIMLock and handset is
              International Mobile Equipment Identity (IMEI) protection.
              This level of protection is simply not possible with
              software-based security systems.

              TI is M-Shield security technology includes secure read-only
              memory (ROM), unique hardware-based public keys, and other
              protection measures to safeguard valuable information, data
              and software stored on a handset, including sensitive personal
              information of handset owners as well as the device is boot
              code and other critical firmware modules provided by the
              handset manufacturer. The investment handset manufacturers
              have made in developing software and other intellectual
              property (IP) is protected against piracy and the handset
              itself is safeguarded against malicious attackers attempting
              to install viruses, worms and other unwanted software on the
              device.

              Fabricating the “LoCosto ULC” solutions with 65-nm process
              technology as well as several other chip- and system-level
              cost optimization techniques all contribute to the device is
              sustainable ULC characteristics. For example, the electronic
              bill of materials (eBOM) for an entry-level ULC handset is
              reduced by up to 25 percent with the “LoCosto ULC” solutions
              compared with the previous generation. Additionally,
              fabricating the chip at a smaller process node means that the
              chip itself is substantially smaller. This, along with
              component reduction, reduces the size of a handset is PCB,
              lowering the manufacturing cost of the cell phone. Integration
              of the power management with the digital baseband into a
              single chip also yields reduction in the modem PCB area.

              图1.TCS2315 “LoCosto ULC“ GPRS手机方框图