DS1813R-5+T&R

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PMIC - Supervisor chips offer a wide range of protection and control functions for a variety of power-management related applications. The DS1813R-5+T&R Supervisors from Maxim Integrated is one such supervisor, optimised for an variety of applications that require monitoring and control of junction temperature, power-on reset, supply voltage and voltage-level supervisor functions. This article shall explain the application field, working principle and features of the DS1813R-5+T&R.

Application Field

The DS1813R-5+T&R Supervisors are ideal for use in devices in a variety of end products, including portable computing, communications devices, Internet-of-Things (IoT) nodes, instrumentation and factory automation products, home and professional audio-visual systems and in automotive systems. The primary application field of the DS1813R-5+T&R Supervisors is for Power-On-Reset, Reset Functions and Voltage Supervisor Functions.

Working Principle

The DS1813R-5+T&R Supervisors are comprised of six main blocks: a temperature sensor, two voltage monitoring and control blocks, a power-on reset block, a voltage supervisor block, and a voltage comparator block. The temperature sensor embedded in the supervisor continuously monitors for thermal events by monitoring the on-chip junction temperature. When the junction temperature reaches a preset critical temperature, the supervisor enters an active thermal protection state, which signals the system to reduce the processor performance and clock frequency in order to prevent overheating. The two on-chip voltage monitored and control block are selectable via digital pins. This allows the device to set up into various voltage sensing/control options, including oscillator start-up, power-on reset, voltage supervisor, and OTP reset functions. The power-on reset block monitors the input voltage levels, while the voltage supervisor block monitors and compares the input voltage level against the level set by the shutdown threshold. The voltage comparator block provides an active-low output when the input voltage is below the set threshold.

Features

The DS1813R-5+T&R Supervisors from Maxim Integrated offer a wide range of features, optimised for its application field. The key features of the device include:

• 2V to 5.5V voltage range.
• Low operating current of 2µA for long battery life.
• Integrated temperature monitoring.
• Push-pull or open-drain reset output.
• Two selectable voltage monitor/control blocks: one for power-on reset, the other for oscillator start-up and other control functions.
• Interrupt output that signals when either of the voltage monitor/control blocks activate.
• A selectable startup delay time of 25ms, 50ms and 100ms.
• Small low-profile SOT23-5 package.

Conclusion

The DS1813R-5+T&R Supervisors from Maxim Integrated is an ideal solution for providing power management and thermal protection for a variety of end products, including portable computing, communications devices, IoT nodes, and audio-visual systems. With its many features, such as 2V to 5V voltage range, low operating power, integrated temperature monitoring, interrupt output and selectable startup delay, the DS1813R-5+T&R stands as a premier supervisor choice.

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