NEXSYS® Component Technology – Sensing Components

Voltage Sensor

Voltage Sensor

Summary Description

The NEXSYS Voltage Sensor (VSD1, VSD2) is a Series A (4 pin)solid-state, direct current (DC) voltage sensor, developed to detect undervoltage and overvoltage conditions. The Voltage Sensor features fault-tolerant circuitry and architecture that provides low-drift sensing over the operating temperature range.

Voltage Sensor Block Diagram

Input Characteristics

28V: Operating voltage (nom.), 2 mA current draw (max.) - VSD1, 4 mA current draw (max.) - VSD2. 

GND: Continuous Ground required. 

SENSE: Detects DC voltage. Voltage sensing includes a hysteresis band to prevent signal chatter.

Output Characteristics

OUTPUT Z: Open-drain output is Ground when active and High Impedance when not active. Output can be specified to activate when SENSE voltage is above or below the specified voltage level. VSD1 output load capacity is 2.0 A (Resistive), and VSD2 is 0.5 A (Resistive).

Configuration Options

The Voltage Sensor is available in two options based on the specified voltage setpoint. 

Voltage Sensor 1 (VSD1): Monitors overvoltage and undervoltage at defined setpoints from +1 to +48 VDC. When combined with a NEXSYS Electronic Latch, the Voltage Sensor can create a wide hysteresis solution with separate pull-in and drop-out levels. 

Voltage Sensor 2 (VSD2): Monitors overvoltage and undervoltage conditions at defined setpoints from +50 mVDC to +1 VDC. When combined with an external shunt resistor (not included), the VSD2 can detect undercurrent or overcurrent conditions by measuring the voltage drop across the external resistor versus unit Ground.

Voltage Sensor – Application Examples

To help system designers understand the potential of NEXSYS Component Technology, we have assembled a collection of Application Notes. The links below show example applications that utilize the Voltage Sensor  component.

Application Example

GPS Ready

GPS Ready This application diagram depicts a flight deck GPS status indicator that has built-in voltage sense circuitry. Depending on the voltage level of the status input, the indicator will indicate the active state of the GPS system and equipment.