회사 블로그 Recycle Renesas Power Supply Support:Power Supply Sequencer,Voltage Supervisor & Reset IC

Recycle Renesas Power Supply Support:Power Supply Sequencer,Voltage Supervisor & Reset IC

Shenzhen Mingjiada Electronics Co., Ltd. has been specialising in the electronic component recycling sector for many years and is a professional provider of inventory management and recycling services within the industry. We purchase genuine, original manufacturer products, obsolete stock, discontinued stock and idle chips at competitive prices, helping businesses to quickly clear their inventory, recover capital and reduce warehousing and management costs.

Key Advantages of Our Recycling Service

1. High-value recycling with industry-leading quotes

Based on global market trends and taking into account model, batch, packaging, quantity and condition (original packaging/removed from board/on board), we provide accurate quotes that are 10%–30% higher than those of our competitors.

There are absolutely no hidden deductions; genuine, factory-sealed products (in original packaging or on reels) will be prioritised for higher quotes, whilst slow-moving stock, discontinued stock and dismantled components will all be fairly priced.

2. Comprehensive Recycling Across All Categories, with No Entry Barriers

No quantity restrictions: we accept everything from single samples to hundreds of stock items, right up to bulk orders of tens of thousands;

No condition restrictions: we accept brand-new, original products; slow-moving stock; components already mounted on circuit boards or those that have been dismantled; and components that have passed testing;

3. Secure, Efficient and Prompt Payment

Streamlined process: Simply provide part numbers, quantities, batch numbers and a condition list; we will issue a preliminary quote within one hour and complete an accurate valuation within 24 hours;

Flexible settlement: We support cash, telegraphic transfers and bank transfers; payment is made immediately upon confirmation of receipt, with no credit terms or delays;

Confidential transactions: We strictly safeguard client information throughout the entire process, sign non-disclosure agreements to prevent any leakage of inventory information, and protect clients’ commercial confidentiality.

4. One-stop, end-to-end service

From inventory categorisation → submission of the list → quotation → inspection → settlement → logistics, we provide comprehensive support throughout the entire process to ensure you enjoy a hassle-free and efficient experience

Transaction Process

Submit the list: Compile detailed information on the chips (model, quantity, batch, package type, condition, packaging) and send it via WeChat, email or telephone;

Accurate Quotation: Our evaluation team will promptly verify the parameters and market conditions, and issue a formal quotation;

Transaction Confirmation: Once both parties have reached an agreement, a buy-back agreement is signed, specifying the delivery method (collection from your premises/courier);

Delivery and Payment: Settlement is processed immediately upon on-site inspection or receipt of the goods, ensuring prompt payment.

I. Functions and Operating Principles of Core Power Supply Components

1. Power Sequencer: Standardising the start-up and shutdown logic of multi-rail power supplies

Unregulated start-up and shutdown of multi-power-supply systems are key causes of hardware damage and system anomalies. For example, if the I/O power supply is energised before the core power supply, this can cause reverse current injection into the chip’s I/O ports and a latch-up effect, resulting in permanent damage to the controller chip; chaotic power-down sequencing can lead to register data anomalies and damage to storage blocks. Renesas’ power sequencer is specifically designed for the timing control of multi-rail power supplies. It precisely controls the sequential power-up, delayed start-up and reverse sequential power-down of multiple power rails, completely eliminating the risk of timing anomalies.

The device incorporates a programmable delay module and a power status verification mechanism, supporting flexible configuration of the power-up sequence (typical sequence: reference voltage → I/O power supply → core power supply → peripheral power supply). Each power supply channel can be independently configured with a start-up delay, whilst also integrating a power-good (PG) signal aggregation judgement function. Subsequent power supplies are only triggered once the preceding power supply has stabilised and met the required standards; should any power supply fail to start, a sequential rollback protection mechanism is automatically triggered, shutting down all power supplies and locking the fault status to prevent the system from operating whilst faulty. Furthermore, it effectively resolves issues such as PG signal jitter and transient interference during multi-rail power-up, thereby eliminating the risk of erroneous timing triggers.

2. Voltage Monitor: High-Precision Real-Time Power Supply Status Monitoring

Power supply voltage fluctuations, under-voltage, over-voltage and transient sags are common operating conditions in industrial and automotive applications. Standard power supply modules are unable to perform precise voltage monitoring, and even minor voltage anomalies can lead to system malfunctions. Renesas’ voltage monitor utilises a high-precision reference voltage source (monitoring accuracy of ±0.5 per cent) to provide 24/7 uninterrupted monitoring of the voltage status across all power rails, covering mainstream system voltages such as 3.3 V, 2.5 V, 1.8 V and 1.2 V.

The device supports customisable under-voltage and over-voltage thresholds and features instantaneous voltage glitch filtering to eliminate transient power supply interference, thereby preventing false monitoring and protection events. Upon detecting a voltage outside the preset normal range, a power supply drop or a supply anomaly, it immediately outputs a fault signal, simultaneously triggering subsequent reset mechanisms and power protection logic. Some high-end models integrate multi-channel synchronous voltage monitoring capabilities, enabling a single chip to monitor 3–4 power rails in parallel, thereby significantly simplifying peripheral circuitry and reducing hardware costs and routing complexity.

3. Reset ICs: Precise System Reset and Fault-Tolerant Recovery

Reset ICs are core components for system fault-tolerant recovery. They receive fault signals from voltage monitors and power sequencers to implement standardised, delay-controllable system reset control, thereby resolving the issues associated with traditional on-chip reset circuits in main controllers, such as low precision, uncontrollable delays and poor immunity to interference. Renesas’ reset ICs feature four core functions—power-on reset, undervoltage reset, manual reset and fault-triggered reset—to accommodate various system recovery scenarios.

The device incorporates a programmable reset delay circuit, allowing reset hold times to be configured between 20 ms and 10 s. This ensures that the reset signal is released only after the supply voltage has fully stabilised, thereby completely eliminating the problems of frequent reset oscillations and repeated system reboots caused by supply voltage ripple. They support a low-level-active reset output, compatible with the vast majority of MCUs, FPGAs and SoC controllers. They also feature reset signal fan-out capability, enabling a single reset source to simultaneously drive system resets across multiple voltage domains, ensuring synchronised system recovery across the entire system. Certain models integrate a watchdog monitoring function, capable of detecting programme deadlocks and operational anomalies, thereby providing dual hardware and software fault-tolerance protection.

II. Key Advantages

1. High reliability, suitable for demanding operating conditions

All core components meet industrial-grade and automotive-grade temperature ranges and possess strong resistance to electromagnetic interference, enabling stable operation under high-temperature, low-temperature, voltage fluctuation and complex electromagnetic environments. High-precision voltage monitoring and controllable reset delay completely resolve various system faults caused by power supply jitter and timing anomalies, significantly enhancing equipment stability and service life.

2. High Integration, Simplifying Hardware Design

A single chip can realise multi-channel power sequencing control, multi-channel voltage monitoring and comprehensive reset management, replacing traditional combinations of discrete comparators, delay circuits and reset chips. This significantly reduces the number of peripheral components, simplifies PCB layout, lowers hardware failure rates and R&D costs, and shortens project development cycles.

3. Flexible and configurable, suitable for multiple scenarios

It supports customisation of power supply start/stop sequencing, delay times, voltage thresholds and reset durations, allowing flexible adaptation to the power requirements of various scenarios such as industrial control, automotive equipment, telecommunications base stations, medical devices and consumer electronics. The solution offers exceptional versatility and portability.

4. Low-power design, energy-efficient and high-performance

The device features an extremely low quiescent current and minimal standby power consumption, making it suitable for battery-powered and low-power embedded devices. It effectively reduces the overall power consumption of the equipment whilst ensuring power supply reliability.

5. Closed-loop protection and comprehensive fault tolerance

It enables power management throughout the entire lifecycle—from power-up, through operation and fault conditions, to power-down—combined with multiple protection mechanisms such as timing rollback, voltage protection, reset recovery and fault lockout. This forms a complete closed-loop power safety system, minimising the risk of hardware damage and data loss.

III. Recommended Renesas Core Device Selection

Based on mainstream application scenarios, we have selected Renesas power management devices that offer excellent value for money and high stability, catering to the requirements of power supply systems with varying numbers of channels and levels of precision:

1. Integrated Multi-Rail Voltage Monitoring and Reset ICs

ISL88021/ISL88022: Three-voltage monitoring reset managers supporting synchronous monitoring of multiple power rails. These integrate power-on reset, under-voltage protection and delayed reset functions, with customisable thresholds, making them suitable for industrial embedded controllers and FPGA power systems.

ISL88041: A four-channel high-precision voltage monitoring IC supporting manual reset functionality with a low-level-active reset output. Suitable for complex multi-rail power supply systems, it enables independent fault monitoring and coordinated reset across all four power rails.

2. Dedicated Power Sequencers

Renesas’ multi-channel programmable power sequencers support timing control for 3–6 power supplies. They integrate PG signal verification and timing rollback functions, allow flexible configuration of power-up/power-down delays, and are suitable for high-end automotive and industrial multi-power-supply systems.

3. General-Purpose Reset ICs

A series of dedicated reset ICs supporting a wide operating voltage range and programmable reset delays. Compatible with multi-voltage-domain systems, with some models integrating a watchdog function, these ICs meet the reset control requirements of various single- and multi-power-supply systems.