Reference DesignAnalog

CN-0274: Ultralow Power, 3-Axis, Motion Activated Switch

Ultralow power motion-activated switch using the ADXL362 and ADP195 to control up to 1.1A. Features <300nA standby current for battery-critical applications.

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Overview

The CN-0274 reference design provides an ultralow power, 3-axis motion-activated power switch capable of controlling up to 1.1 A of load current. The circuit is designed for battery-critical applications, drawing less than 300 nA in the off state and less than 3 μA in the on state. It utilizes the ADXL362 nanopower MEMS accelerometer to monitor acceleration and toggle the ADP195 high-side power switch based on the presence or absence of motion. The ADXL362 provides 12-bit resolution and operates in wake-up mode to minimize energy consumption, while the ADP195 offers reverse current blocking and low on-resistance to reduce power losses.

Use Cases

Wireless sensors
Metering devices
Home healthcare monitors
Portable electronics
Battery-powered asset tracking

Topics

ADXL362

ADP195

motion activated switch

MEMS accelerometer

nanopower

high-side power switch

CN-0274

Analog Devices

reverse current blocking

Referenced Parts

ADP195

Analog Devices

The ADP195 is a high-side load switch designed for operation between 1.1 V and 3.6 V and is protected against reverse current flow from output to input.

ADXL362

Analog Devices

The ADXL362 is an ultralow power, 3-axis accelerometer that consumes less than 100 nA in wake-up mode.

ADP190

Analog Devices

For applications requiring less downstream power, the ADP190 can be used. It has a continuous current of 500 mA and is available in a smaller WLCSP package than the ADP195.

ADP197

Analog Devices

By sacrificing approximately 15 μA of quiescent current, the ADP197 is capable of providing 3 A of current to downstream circuitry.

ADP195	Analog Devices	The ADP195 is a high-side load switch designed for operation between 1.1 V and 3.6 V and is protected against reverse current flow from output to input.
ADXL362	Analog Devices	The ADXL362 is an ultralow power, 3-axis accelerometer that consumes less than 100 nA in wake-up mode.
ADP190	Analog Devices	For applications requiring less downstream power, the ADP190 can be used. It has a continuous current of 500 mA and is available in a smaller WLCSP package than the ADP195.
ADP197	Analog Devices	By sacrificing approximately 15 μA of quiescent current, the ADP197 is capable of providing 3 A of current to downstream circuitry.