Author Archives: allaismt

RK3399 is a low-power, high-performance application processor chip introduced by Ruixinwei, which is based on Big.Little architecture, that is, dual-core Cortex-A72 and quad-core Cortex-A53 combined architecture with independent NEON co-processors. It is mainly used in intelligent terminal devices such as computers, personal Internet mobile devices, VR and advertising machines. RK3399 has built-in multiple high-performance hardware […]

Before the patch processing in Xi ‘an SMT small batch patch processing factory, there is a process that is not particularly noticed, that is, baking. Some circuit boards in the electronics factory that don’t meet the requirements of Xi ‘an SMT chip processing due to long storage time and humidity in the storage environment can […]

The thermal, mechanical and electrical behavior of each PCB depends on the material characteristics of PCB substrate, conductor and component materials. Among these different materials, PCB designers can control the behavior of the board to the greatest extent by choosing the right PCB substrate material. The performance of PCB materials, especially the performance of resins […]

1.PCB wiring and layout isolation criteria: strong and weak current isolation, large and small voltage isolation, high and low frequency isolation, and input and output isolation. The demarcation standard is one order of magnitude difference. The isolation method includes: the space is far away and the ground wire is separated. 2. The crystal oscillator should […]

Firstly, this paper analyzes the key technologies of GSM communication system, introduces the system composition and working principle of GSM mobile phone baseband and radio frequency in detail, and further analyzes and studies the platform MTK6225 provided by MediaTek, as well as the hardware design and basic debugging of GSM mobile phone on this platform. […]

MCU is just the beginning … The cost and time-to-market requirements of entry-level MCU design are becoming more and more urgent. With the development of embedded software becoming the biggest contributor, MCU development kit must provide the same high-level value and usability as MCU. At present, designers demand powerful, simple, low-cost or, in some cases, […]

Besides the selection of components and circuit design, good printed circuit board (PCB) design is also a very important factor in electromagnetic compatibility. The key of PCB design is to minimize the reflow area and make the reflow path flow in the designed direction. The most common return current problems come from cracks in the […]

Basic requirements of wiring in high-speed PCB design (1) the outlet of rectangular pad of 1)QFP, SOP, etc. package should be led out from the PIN center (generally, shape is used). (2) The distance from the wiring to the board edge is not less than 20MIL. ) (3) Other network vias and surface wiring are […]

Base station, information communication between base stations. V2 is the key technology to realize intelligent transportation technology in the future. NXP, formerly known as Philips Semiconductor Company with a long history, has a very mature practical application scheme and technical platform for vehicle-to-outside information exchange (V2X). On the vehicle V2X communication, NXP provides complete solutions […]

Freescale Kinetis series is a microcontroller based on ARM CORTEX-M4 introduced by Freescale. Design of Freescale K60 Clock System As shown in the above figure, the Freescale K60 clock system can find that there are four source clock sources of the device: ① Internal reference clock sources, including Fast IRC and Slow IRC (IRC-Internal Reference […]