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S-1003CA28I-M5T1U Application Field and Working Principle

The S-1003CA28I-M5T1U is a supervisor/power-on reset IC from the S-1003 Series of precision reset supervisors.

Introduction to S-1003 Series

The S-1003 Series provides the most reliable way of resetting microcontroller, microprocessor, and peripheral systems. With an ultra-low 0.2μA maximum supply current, power consumption is kept to an absolute minimum. There are three main products in the S-1003 series: the S-1003C, the S-1003P, and the S-1003H. Each has their own distinct features and can be used for a variety of applications.

The S-1003C and the S-1003P are both superscalar designs that consist of two independent precision reset supervisory circuits. Each one of these circuits behaves the same way and the action of one affects neither the other or the system. This makes the S-1003 range very reliable when used in pulse-width-modulated (PWM) operation.

The S-1003H is a hybrid design with two independent clock circuits. The first clock circuit is used for synchronous reset and is based on the S-1003P design. The second clock circuit is based on the S-1003C design and is mainly used for monitoring the high order bits of the microprocessor.

Features of S-1003CA28I-M5T1U

The S-1003CA28I-M5T1U is a supervisor/power-on reset IC that features:

• Ultra-low 0.2μA supply current
• Extended reset input voltage range of 1.2V - 5.5V
• Commercial, Industrial, and Automotive Temperatures
• CMOS logic compatible reset input
• Low reset threshold voltage of 3.0V
• High reset threshold voltage of 5.5V
• Power On Reset (POR) output available

Applications

The S-1003CA28I-M5T1U is used in a variety of applications that require reliable and accurate reset and power-on reset capabilities. These include:

• Automotive systems
• Industrial system
• Telecommunications
• Security systems
• Robotics
• Medical equipment
• Computer systems
• Office equipment

Working Principle

The S-1003CA28I-M5T1U works according to a two-level reset supervisory principle. The first level is the Power On Reset (POR) circuit, which holds the reset output low until a preset power-on sequence is completed. This allows the system to be safely powered up from a cold start. The second level is an independent reset circuit, which monitors the system power rails for an out-of-control condition or for a failure or reset switch. If either of these conditions is detected, the circuit will issue a reset.

The S-1003CA28I-M5T1U also features a system power monitor (SPM) circuit. The SPM circuit monitors the system power rail voltage, and if it drops below the preset threshold voltage, the reset output will be pulled low. This feature prevents accidental data corruption or loss of control when the system power is unexpectedly lost.

The S-1003CA28I-M5T1U also features built-in overcurrent protection (OCP) to protect the system power rail from system overcurrent conditions. The OCP circuit monitors the system current and will issue a reset if the current drawn by the system exceeds the preset threshold.

Conclusion

The S-1003CA28I-M5T1U is a highly reliable and accurate supervisor/power-on reset IC from the S-1003 Series of precision reset supervisors. The S-1003CA28I-M5T1U features an ultra-low 0.2μA maximum supply current, extended reset input voltage range of 1.2V - 5.5V, system power monitor, overcurrent protection and a wide range of operating temperatures. It can be used for a variety of applications such as in automotive systems, industrial system, telecommunications, security systems, robotics, medical equipment, computer systems, and office equipment.

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