S-80853CNMC-B9ET2G

Power Management ICs (PMICs) are a type of semiconductor ICs that can provide effective power management for any electronic system. Supervisors are one of the primary categories of PMICs. Supervisors are designed to monitor a voltage supply power rail to ensure the system is working correctly.The S-80853CNMC-B9ET2G is a supervisor IC from Renesas Electronics, one of the most well-known suppliers of PMICs. The supervisor provides a low-voltage detection (LVD) circuit and a general-purpose reset circuit that can be used to keep the system within a safe voltage range. The device features a fail-safe timer and can detect out-of-range conditions and respond with proper voltages. Additionally, the supervisor can be configured as a reset source with an optional open/short detection circuit.

Application field

The S-80853CNMC-B9ET2G is designed for applications that rely on low-voltage detection for reset control. These applications include smart-power systems, IoT, communications devices, automotive, and other industrial systems where power supply conditions must be monitored. In these applications, the supervisor protects the system from damage or misoperation that could otherwise be caused from an unexpected power-down condition.

Working Principle

The S-80853CNMC-B9ET2G operates on a supply voltage of 1.3V to 5.5V and is rated for a maximum output current of 5mA. When the input power is on and the supervisor is configured to detect out-of-range conditions, it will set the output voltage to Low if the input voltage is below the voltage set by the LVD trimming resistor and the output voltage will be set to High if the input voltage is above the voltage set. This allows the supervisor to protect the system from any sudden changes in the input power.

When the system is powered on and the supervisor is activated, the LVD initially charges the reset capacitor until the voltage at the Reset pin reaches the trip point and trips the comparator. The comparator will then discharge the reset capacitor, maintaining the reset level. When the input voltage drops below the LVD trip point, the reset capacitor will remain discharged, keeping the reset level low indefinitely. This is done to guard against unintended reset events while the system is running.

To improve reliability, the supervisor has a fail-safe timer that is enabled when the output voltage is Low. The fail-safe timer is used to ensure that the system will not be affected by any intermittent out-of-range conditions. The timer will trigger when the input voltage falls below a certain voltage and the output voltage does not reach the Low state after a certain amount of time. This will cause the supervisor to re-generate the reset, allowing the system to reset and prevent any potential malfunction.

In conclusion, the S-80853CNMC-B9ET2G supervisor IC from Renesas Electronics is a reliable solution for monitoring power conditions for many different applications. The supervisor can be used to protect any system from unexpected power loss and respond in case of power irregularities. It can be used to keep the system within its safety ranges, while providing a fail-safe timer to prevent any unintended resets.