MC34161P

Series:	--
Packaging:	Tube
Part Status:	Obsolete
Type:	Multi-Voltage Supervisor
Number of Voltages Monitored:	2
Output:	Open Drain or Open Collector
Reset:	--
Reset Timeout:	--
Voltage - Threshold:	Adjustable/Selectable
Operating Temperature:	0°C ~ 70°C (TA)
Mounting Type:	Through Hole
Package / Case:	8-DIP (0.300", 7.62mm)
Supplier Device Package:	8-PDIP
Base Part Number:	MC34161

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MC34161P application field and working principlePMIC (Power Management Integrated Circuit) are essential components in any electronic systems, and Supervisors are one of the subcategories of PMICs. The MC34161P made by ON Semiconductor is one of the typical PMIC Supervisors with applications in portable devices such as phones, wearables, and internet of things (IoT). This article will explain the characteristics and advantages of the MC34161P and explore the working principle and application fields of the device.Characteristics and Advantages The MC34161P is a 20-lead Small Outline Integrated Circuit (SOIC) package with adjustable supply voltage from 2.5V to 5.5V. It is capable of monitoring 1.3V to 5.5V power supply voltage through an integrated voltage detector and offer OV, UV, OT, and UV protection. The reset output is available in active-low and active-high mode which supports multiple voltages and sources, including rail-to-rail, low-noise, and low current output. In addition, it comes with slew-rate limited low-power open-drain and open-collector buffers. The main programs of the MC34161P include programmable reset timing, microprocessor unlocking, I2C interface programming via the I2C serial interface, and system powerup after power loss. The device allows low-power mode like sleep mode, advanced chip test, and pre-programming of the turn-on sequence and serial programming. Besides, its on-chip temperature sensing system provides a way to monitor the environmental conditions in the system. This feature allows the user to monitor the system temperature remotely for system control and optimization. Working PrincipleThe working principle of the MC34161P begins with the connection of a suitable voltage source, typically from a battery with the Vin pin of the device. The voltage source supplies power to the IC and the integrated voltage detector inside the IC measures the voltage of the power supply connected to the Vin pin. If the voltage is lower than the predetermined level, the voltage detector will output a voltage signal to the reset output and pull the reset output to low state.The IC then compares the output voltage level with a set threshold, which is determined by the combination of an internal voltage divider and an external resistor. The voltage divider sets the base voltage while the external resistor adjusts the threshold voltage. If the output voltage level falls below the preset threshold, a reset output signal is activated. Application FieldThe MC34161P is ideal for applications with low-voltage power supplies and it can be used in combination with low cost, low current microcontrollers. It provides many advantages and is suitable for use in a variety of applications such as portable devices, wearables, internet of things (IoT), motor system controllers, and power management systems.In portable devices, the MC34161P is useful for monitoring the power supply voltage of the device. It can detect voltage changes due to change of battery capacity or when external power is applied, and then reset the device when necessary. For wearables, it can detect when the device has been disconnected from the user, stop any unnecessary current consumption, and reduce power consumption of the device. In IoT, the temperature sensing system of the MC34161P is useful for monitoring the temperature of the system, helping to optimize the power efficiency of the device. In motor system controllers, the MC34161P can detect if the current supplied to the motor is insufficient and then reset the device immediately. For power management systems, it is capable of resetting the system or certain components if the device fails or operates at an insufficient voltage.ConclusionThe MC34161P is a versatile and reliable IC for applications where power supply monitoring and reset functions are needed. It is ideal for monitoring voltage levels and providing reset when necessary in a wide range of applications such as portable devices, wearables, internet of things (IoT), motor system controllers, and power management systems. The device can also offer OV, UV, OT, and UV protection and includes temperature monitoring system and programmable reset timing.

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