The price of the product has been rapidly declining recently. Garmin's recently launched GPS product, the Nuvi 205, is available for a new round of peak usage and is available in many US retail stores.
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This design reveals the Garmin Nuvi 205, which retails for only $199. It is the first PND (Personal Navigation Device) I have seen in blister packaging. What caught my attention was the vacuum-packed Nuvi 205 on the open shelves of a local electronics hypermarket. The price of the PND is clearly no longer required to be placed in a locked glass showcase. The Nuvi 205 itself and the way it is sold show that the personal GPS system is becoming a popular commodity.
Garmin is not the first and not the only manufacturer to sell less than $200 PND. But in terms of its price, the Nuvi 205 is quite rich in features. A 3.5-inch 320 x 240 touch screen is used to display full-color Navteq 2D/3D map data, which is pre-downloaded into the Nuvi 205. In addition to the traffic information and news functions of the FM band of the MSN Direct service, the Nuvi 205 also features a voice turn alert feature. Geo-annotated images on the Google Image Community Panaramio can be downloaded to the user's MicroSD expansion card, providing a more realistic visual experience than the map.
The Nuvi 205 even includes a car charger and accessories for fixing it to the windshield, so when you buy the Nuvi 205, you can get a fairly complete navigation experience without spending more.
Because the Nuvi 205 is designed for entry-level users, its peripheral interface is fairly simple. The Nuvi 205 has only one “openâ€, “off†and “lock†three-speed slide switch above the white plastic case. The back of the case has a USB port and a side MicroSD expansion card slot. The reset button is hidden in the molded button to prevent abnormal operation of the system due to locking. It seems that something will never go out of fashion.
After unscrewing the two screws hidden under the product label and opening the upper and lower buckle housings, you will see the PCB that holds all the electronic parts of the system. The LCD is connected to the LCD touch screen module in a ZIF-free slot. The LCD touch screen is friction-fitted to the upper half of the chassis. Three screws secure the PCB to the lower half of the case. Once the three screws are removed, you will see a 3.7V/1250mAh lithium-ion battery and an 8Ω speaker under the PCB. Both the speaker and the battery are plugged into the PCB using separate wires. According to Garmin, the battery life and charging time are 4 hours.
The board uses an 8-layer drilled glass epoxy PCB technology that implements all GPS receiver and processor functions. By carefully placing the device to optimize the signal flow, the pad spacing of the components is carefully configured to achieve escape routing through conventional drill vias, saving the additional cost of high density laminate PCB technology. When it is necessary to consider the low price point, it is necessary to carefully calculate every penny, and then a slight reduction in the cost of raw materials will be critical.
Garmin uses highly integrated chips to reduce costs. Architecturally, the Nuvi 205's design is only divided into three parts: GPS processing, memory and analog functions.
In the basic GPS processing, the ST's single-chip RF front end STA5620 demodulates and converts the RF signal from the internal 25mm2 ceramic block patch antenna. Since the independent GPS is less restrictive in form than the GPS embedded in other systems (such as mobile phones), a larger antenna with a higher gain than a compact stamped metal antenna is still installed in the product. . In order to obtain faster signal positioning time, Maxim's LNA is used at the front end of the receiver chip to further improve the signal-to-noise ratio.
The signal from the RF receiver is sent to the system's main processor for handling GPS correlator functions and system control and peripheral support - a processor labeled Garmin-ST. The Garmin-labeled processor and the ST-based "Cartesio" series STA2062 processor based on the ARM core and built-in GPS function have many similar physical and functional attributes. It is obviously logical to use the ST RF front end. Speech synthesis, LCD control, microcontroller functions, USB and memory interfaces are all included.
The system memory used by the processor is 32MB DDR SDRAM from Hynix (for working memory) and SanDisk's 2GB iNAND flash. Flash memory is used to store all map data and system code (downloaded to DDR SDRAM) with a NAND controller that manages the interface to the host processor. Wear leveling or error correction and formatting of the SD or SPI bus interface are also performed by the controller chip, which is packaged with memory that is apparently multi-level cell (MLC) NAND chips.
Analog function
In addition to GPS and memory, the rest of the system implements the analog function of the system. Linear Technology's LTC35571 is responsible for USB battery charging and DC-DC conversion; Linear Technology's other chip, the LT3591, is used for power management of white LED backlights used in Sharp LCD touch screen modules. The touch screen controller uses TI's TSC2046, and TI's other two chips, PCM1774 and TPA2010, implement stereo DAC and audio power amplifier functions, respectively.
Every breakthrough in GPS performance and price will trigger a new wave of buying, and Garmin seems to be interested in attracting price-sensitive users. With full-featured PNDs appearing in hypermarkets at less than $200, the next question for Garmin and all of its competitors is clearly: How far is it from $100?
Figure: Internal structure and related components of Garmin Nuvi 205
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