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