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MF200-NFB15H_Datasheet PDF

时间:2021-06-14 00:45:42 来源:网络整理编辑:Crescent

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Choosing an HMI development community To mitigate the costs of HMI design, projects should consider using a technology that is both appropriate for in-vehicle systems, and supported by a large and experienced developer community. This technology should be an automotive-quality technology proven in embedded environments and backed by a mature community.

Choosing an HMI development community To mitigate the costs of HMI design, projects should consider using a technology that is both appropriate for in-vehicle systems, and supported by a large and experienced developer community. This technology should be an automotive-quality technology proven in embedded environments and backed by a mature community.

(d) Verifies the suggested reduction techniques do not adversely affect other design targets such as area, timing and noise.

(e) Tracks power throughout the design process; through power regressions” that help immediately flag any design changes that may be functionally correct, but that can cause power increases.

MF200-NFB15H_Datasheet PDF

Once the power target goals are achieved in the RTL stage, the logic and circuit changes and power bugs” are identified and addressed, then extensive verification must be done. This will ensure that the low power techniques introduced perform and deliver the expected savings, but also that they do not adversely impact the design. For example, the amount of predicted power savings that can be achieved through clock gating may not be realized due to the introduction of clock buffering (during the synthesis phase), that is needed to meet timing and clock skew constraints.

As apparent in figure 3 , the margin available to prevent accidental device turn-on continuously shrinks as designers use much lower supply voltages to reduce the power consumption and heat dissipation. Increased levels of noise in the power and ground networks from circuit changes such as clock and power gating that are used to achieve low power targets, impacts an already reduced margin. Referring back to the example of using clock gating to reduce operation power, increased levels of clock buffering can cause high dynamic voltage drop in the design if the placement of these clock buffers is not done optimally.

Power gating is often used for standby power reduction. However, if the implementation of power gating is not properly done, it can affect the performance and functionality of the design, and waste more power. For example, if the power gate is sized improperly, it can introduce excessive drop through the power gate (when sized smaller than needed), or it can cause excessive leakage in the standby mode (if sized larger than needed). Additionally, if the turn-on sequence of the power gates is not well controlled, it can cause a high rush-current” in the device that generates noise through coupling in other parts of the chip.

MF200-NFB15H_Datasheet PDF

Accurate estimation and prediction of voltage drop in the chip is very important for low power designs. So if the system in which the chip operates is not considered in the simulation through incorporating the package and PCB parasitics, the on-die voltage drop analysis is incomplete. The design, optimization and verification of a low power chip must be done in conjunction with the design and optimization of the package that the chip will reside in, and the PCB that the packaged chip will go on. This can be achieved by providing accurate models of the package and board to the chip team, and by providing an accurate model of the chip to the package and board team. These models must capture all relevant electrical parameters (e.g. all switching current and parasitic information), and must be silicon validated for accuracy.

So, as you look to reduce operational and/or standby power, re-think your design methodology first. Establish power as a design target, starting from the micro-architecture and RTL design process. By leveraging an analysis driven optimization approach, you can explore different power saving modes and not be restricted to only one methodology. Using RTL based power estimation numbers that are available on-die, you can initiate power grid and package design planning and prototyping. Once RTL optimizations are done and a synthesized netlist is available, layout based power integrity analyses must be performed at the full-chip level, along with the package and PCB models, to quantify the success of the RTL stage optimizations and ensure that voltage drop in the chip is contained. In parallel, the package/PCB must be optimized considering the impact of the die to ensure the power, thermal and signal integrity of the system.

MF200-NFB15H_Datasheet PDF

In conclusion, the successful design and delivery of a low power chip requires a comprehensive design for power methodology that impacts not only the design of the IC but also of the entire system to meet the needs and demands of a power-conscious society.

About the author: Aveek Sarkar is vice president of product engineering and support at Apache Design Solutions Inc. (San Jose, Calif.)

Park Assist System : An optional safety system in high demand. Assists the driver in parking maneuvers where visibility is restricted.

The emerging center console With the availability of advanced technologies coupled with increased focus on the human machine interface aspect of console design, a change is being ushered into the design model of center consoles. Technologies prevalent in the consumer space are being adopted for the automotive environment and are enabling engineers and designers greater freedom in design of the console.

The brick” model above of stacking individual, independent modules is now giving way to a more HMI-centric, integrated design model. This design model distributes control panels (HMI centric) separately from the actual electro-mechanical unit of each center console element. Such a design methodology enables designers to focus on the actual HMI of the center console as a whole without having to interface with individual discrete components and create an integrated look and feel.  This concept is illustrated in the diagram and explained below.

The brick design model In the brick design, each center console component is a complete unit comprised of the controls/switch panel as well as the actual electromechanical box. For example, a center console is composed of a number of independent components including the HVAC, audio, and navigation units, and each unit is a complete system comprising the controls, electronic components, mechanical actuators, etc. This design approach enables a distributed development amongst tier one suppliers with each one specializing in one or more of the individual components. The car manufacturer is responsible for integrating each system in the center console almost independently of each other.

The limitations of such a design methodology is that the car manufacturer has only limited control in being able to provide a uniform look and feel. Likewise, the component designers also have limited freedom to design center consoles with various restrictions on styling.  There is also an increased cost adder to allow for tooling costs associated with additional grooves and harnesses. Due to the increased number of mechanical components, there is also an increased chance of failure.