Chip selection (What problems should be noted in chip selection)

• 1, What is the principle of arm chip selection
• 2. Domestic ADC chip selection
• 3, How to select the design scheme of digital tube clock voice broadcast chip?
• 4, Introduction to voice chip selection

What is the principle of arm chip selection

1, as a product development, in the selection of chips must consider its support for the software, such as what kind of OS support. For existing OS people, in the selection process to consider whether the selected chip supports the OS, it can also be vice versa, that is, whether the OS supports the chip. (10) Technical support The current trend is to buy services, that is, to buy technical support.

2, selection principle From the application point of view, the main factors that should be considered in the selection of ARM chips are explained in detail. If ARM wants to use operating systems such as WinCE or Linux to reduce software development time, it needs to choose ARM chips with MMU functions above ARM720T, ARM720T, StrongARM, ARM920T, ARM922T, and ARM946T all have the MMU function.

3, from the perspective of application, the main factors that should be considered in the selection of ARM chips are explained in detail. When large capacity memory is not required, you can consider choosing an ARM chip with built-in memory. See Table 1.

4, when the single chip chip selection, the general principle is: "the chip contains (function or quantity) slightly greater than the design requirements", "the design needs as far as possible (with) the chip to complete (less peripheral devices)", "choose large (big factory) do not choose small, choose more(more supply) do not choose less, choose name (brand name) do not choose miao (Miao, do not know the details of the factory), choose cheap (modest price) but good (quality assurance).

5, choose a suitable ARM CPU embedded operating system several important factors: the first is the application. If you want to develop an embedded device that is closely related to a network application or is a network device, then you should choose to use embedded Linux or mCLinux rather than mC/OS-II. The second is real-time.

Domestic ADC Chip Selection

In the world of exploring domestic ADC chip selection , we must first understand the basis of this technology - the digital conversion art of analog signals. ADC chip selection , the full name of analog to digital converter chip selection , is a key component in electronic design chip selection , which solves the mode of the signal worldThe bridge between analog and digital problem. Integrated ADCs and sensors are at the intersection of modern technology, and together they build the perception capabilities of devices.

Lichuang EDA can also. EDA's software has an efficient design engine and optimization algorithm, which can quickly complete complex circuit design and layout. EDA's software interface is simple and clear, easy to operate and learn, suitable for beginners and professional engineers.

AD60AD603A, AD603AR, etc. Domestic vga is an analog signal output interface on the graphics card, also known as D-Sub interface, in which the operation is amplifiedThe functional requirements of the above scheme design can be realized by jumping the chip.

With Protues 7 software, we have implemented a detailed simulation design, allowing the design process to be visualized.

- If you are doing real-time clock or using assembler, C language is not accurate assembly. Use assembly, and then define the relevant registers, such as hours, minutes, seconds, etc. Interrupts are also used as timers. Do not know how your hardware circuit, if I/O is relatively small, you can use dynamic scanning program. In addition, some keys need to be defined to adjust the time and trigger of the keysEvents can be arranged in a scanner or in an interrupt.

First of all, we must determine the hardware circuit, the specific 1302 and how the digital tube is connected to the MCU. Then, in order to write the program, we must first write the digital tube font array, but the digital tube can normally display numbers and some special symbols, so that it is also easy to debug the program. Finally, read the data of 1302, read the transformation, and send it to the digital tube display.

Give you a circuit and program, // A few days ago to help a netizen write, single-chip timing clock in the adjustment function, you can refer to my program / 6-bit digital tube display electronicsClock function: button add, button subtract, button, start and stop.

A total of eight sections of digital tube 6. CD4511 integration block 6 blocks. CD4060 Integration block 1. 74HC390 Integrated block Three. 74HC51 Integrated block 1. 74HC00 Integrated block 5. 74HC30 Integrated block 1. 10 Mω resistors 5. 500Ω resistors 14. Two 30p capacitors. 3768k clock crystal 1. The buzzer.

Introduction to voice chip selection

GenerallyThe principle of sex: The selected voice chip should be widely used and verified, and have been studied by a large number of experiments. 2) The principle of high cost performance: In the case of similar functions, performance and utilization, try to choose inexpensive voice chips to reduce costs. 3) The principle of convenient procurement: try to choose chips that are easy to buy and have a short supply cycle.

Speech recognition chip Compared with the traditional voice chip, the biggest feature of the speech recognition chip is to be able to voice recognition, it can make the machine understand the human voice, and can perform various actions according to the command, such as blinking eyes, moving the mouth (smart doll). In addition, phonological awarenessThe chip also has the function of high quality and high compression rate recording and playback, which can realize man-machine dialogue.

From the supermarket's big speakers, its recording time ranges from 120 seconds to 360 seconds, mainly using cost-effective MP3 chips, recording effect is acceptable. Such products as toy recording, such as cactus, usually use Taiwan ADPCM technology, although it can be customized and optimized, but the overall effect is limited and difficult to develop. Professional-grade recording equipment, such as live sound cards, have extremely high requirements for recording chips, and high-end brands such as AKM are common choices.

Voice chip selection, with the development of science and technologyWith the integration of products, voice chips have gradually replaced a variety of voice equipment applications in various occasions. The main features of the voice chip are low power consumption, strong anti-interference ability, few peripheral devices, simple control, long voice storage time (some voice chips can save the content for 100 years), no loss of voice after power failure, and some chips can also repeatedly erase and write the voice content.

Power consumption: The power consumption of voice recognition chips is also an important consideration, especially for mobile devices or low-power applications, which need to choose energy-efficient chips to extend battery life. Interface and compatibility: Voice recognition chips need to work with other hardware or softwareThe system is integrated, so the interface and compatibility of the chip need to be considered to ensure seamless integration into existing systems.