In today's semiconductor industry, microprocessor systems are extensively utilized in industrial control, smart instrumentation, and portable electronic devices. These applications demand stringent stability requirements for microprocessors, particularly regarding the continuous controllability of power supply voltage. The stable operation of microprocessors heavily relies on precise voltage regulation, as any voltage fluctuation exceeding threshold values may cause program malfunctions, data corruption, or even complete system crashes. However, traditional power monitoring chips face multiple challenges: they typically provide only a single voltage threshold level, making it difficult to meet the diverse power supply needs ranging from 2.4V lithium batteries to 5V USB; their high static power consumption (often exceeding 50μA) shortens the battery life of portable devices; additionally, open-drain outputs require external pull-up resistors, which not only increase bill of materials (BOM) costs but also add pressure to PCB layout; under low VCC conditions (<1.5V), these chips may fail to reset and cannot handle extreme operating conditions such as power outages.

The CBM810X series microprocessor monitoring circuit by Corebai Microelectronics is engineered with precise parameter design and scenario-based optimization. It addresses the core requirements of 'reliable monitoring, low power consumption, and simplified design,' delivering a comprehensive power supply solution for microprocessor systems across all scenarios.

1、Core Features

Ⅰ. Multi-level precise reset threshold with multi-scenario power supply

The CBM810X series features seven reset thresholds (Table 1: Reset Model vs. Threshold Voltage Comparison), spanning from 2.32V (Z-type) to 4.63V (L-type). These thresholds precisely match various power supply scenarios: 2.32V/2.63V for 2.4V/3.0V applications in lithium battery-powered devices (e.g., portable instruments), 3.08V/2.93V for 3.3V embedded systems, and 4.00V/4.38V/4.63V for 5V industrial power supplies. Each model maintains strict ±3% threshold deviation control (e.g., CBM810L:4.56V–4.70V, typical value 4.63V), ensuring accurate reset triggering during voltage fluctuations and preventing monitoring failures caused by threshold deviations.

Table 1 Comparison of Reset Models and Threshold Voltage

Ⅱ. Ultra-low static power consumption, extending battery life for low-power devices

The CBM810X series features tiered optimization for static current: with VCC below 3.6V (for R/S/T/Z types), it delivers a typical 17μA and a maximum 30μA current; when VCC drops below 5.5V (for L/M/J types), the typical current is 24μA with a peak of 35μA. Compared to conventional monitoring chips (typically exceeding 50μA in static current), this series achieves over 60% lower power consumption.

Ⅲ. Push-pull output design simplifies circuitry and reduces costs

The CBM810X features a push-pull RESET high-level output (product description) without external pull-up resistors, unlike the open-drain output of its sibling CBM803X. Its output level characteristics are stable: when VCC exceeds VTH max, VOH is ≥0.8VCC (I SOURCE=150μA, 1.8V<VCC<VTH min); when VCC equals VTH min, VOL is ≤0.4V (L/M/J type, I SINK=3.2mA), meeting the logic level requirements of most microprocessors.

Ⅳ. Reliability of High Pressure and Stable Reset Timing

Wide operating voltage range: The power supply voltage spans 1.0V to 5.5V (Table 1), with reset functionality maintained even at 1V VCC (product description). This comprehensive voltage coverage ensures reliable reset during system power-on and power-off cycles, preventing reset failure at low voltage levels.

Stable reset sequence: The minimum power-on reset time is 140ms, with a typical value of 240ms, and the reset pulse width ranges from 140ms to 460ms (Table 1). This ensures the microprocessor completes initialization after power stabilization, preventing startup sequence disruptions.

Ⅴ. Industrial-grade environmental adaptability, enhancing scene resilience

The maximum rated value indicates that the CBM810X operates within a storage temperature range of-65℃ to 150℃ and a working temperature range of-40℃ to 85℃, making it suitable for harsh environments such as industrial high-temperature and outdoor low-temperature conditions. It is available in two package sizes: SC70-3 (2mm × 1.25mm) and SOT23-3 (2.9mm × 1.3mm), meeting the miniaturization needs of various devices.

2. Typical Application Scenarios

Ⅰ. Industrial controllers (e.g., PLCs, sensor controllers)

Industrial controllers must operate within a wide temperature range of-40℃ to 85℃, while also handling voltage fluctuations in power grids (e.g., 3.3V/5V after 380V/220V voltage reduction). The CBM810X features wide temperature tolerance and 1.0V low VCC reset capability, effectively preventing reset failures caused by low temperatures or voltage fluctuations. Its push-pull output design simplifies circuitry, thereby reducing maintenance costs for the controller.

Ⅱ. Intelligent instruments (e.g., portable detection devices)

The portable instrument is powered by 2.4V/3.7V lithium batteries, with high sensitivity to power consumption and size. The CBM810X features a 17μA low static power consumption to extend battery life, while its 2.32V (Z-type) and 2.93V (S-type) thresholds precisely match the battery voltage. The SC70-3 small package is designed for miniaturization of instruments, and its precise thresholds ensure that detection data remains unaffected by voltage anomalies.

Ⅲ. Microprocessor systems (e.g., embedded control modules)

Most embedded modules operate on 3.3V/5V power supplies and require high-density PCB layouts. The CBM810X features 3.08V (T-type) and 4.00V (J-type) thresholds that align with mainstream voltage standards, with a typical 240ms reset time to ensure stable initialization. Its push-pull output without external resistors further reduces module size, enabling seamless integration into high-density PCB designs.

Core Differences Comparison of CBM803X/809X/810X Series in the Same Selection Table