CT D1 1 0 User Guide General Description Referenced Devices The CTD110 demo board is shown below CT100 and it features: CTD110 9x, male header connectors 2x, large connectors 1x, quad-opamp Introduction 1x, 3.3 V linear regulator The CTD110 demo board is designed to 1x, CT100 device in SOT23-6 demonstrate the current sensing capabilities package of the CT100 linear magnetic sensor from Crocus Technology. The two (2) large connectors (with screws) are used to connect and drive the external The CT100 is based on Crocus Technologys current to be measured. Please do not TMR technology. It features a full-bridge exceed 20 A . RMS configuration compromised of four (4) TMR elements. The CT100 does not include any The 3-pin male header on the left of the active CMOS circuitry allowing it to be a board labeled, from top to bottom: OUT, VSS versatile and low power with a small package (GND) and VDD are used to connect the footprint. power supply, ranging from 1.0 V to 5.0 V This user guide describes how to connect and the output pin to a metering device (e.g. and use the CTD110 demo board. It also oscilloscope, multimeter, etc.). provides a description of the circuit implemented and expected test results. Features 0.5% accuracy 20 A range RMS 70 mV/A Gain Non-intrusive current sensing Galvanic isolation 1.0 V to 5.0 V power supply FIGURE 1 CTD110 DEMO BOARD QUICK START 2019 Crocus Technology 1 Document : CTD110 User Guide Rev0.2 The 3-pin male header on the right of the board labeled, from top to bottom: VREF, OUT+ and OUT- are used for further evaluation of the CT100 or external custom circuitry. OUT+ and OUT- are the direct outputs of the CT100 full bridge structure. VREF is the onboard reference voltage generated for offset compensation. Package Additionally, the 3-pin male header to the top of the board labelled as GND, GND and PCB RCOUT. The two (2) GND connectors are additional ground pins that can be used to connect to external power supplies or Current Trace meters. The RCOUT pin is connected to the filtered output of the current sensor. The single-pole RC filter is designed for a 3-dB FIGURE 2 FEMM SIMULATION FLUX DENSITY frequency of 1 kHz. PLOT The distance between the sensor and the Magnetic Simulation current trace includes the total thicknesses of: PCB, top layer, soldering paste and the Simple magnetic simulations can be done to vertical position of the die inside the estimate the magnetic field that the CT100 package. sensor will see. Using FEMM software, the simulated Gain of the current trace is 95 T/A The demo board uses standard copper layers and process: PCB copper layer thickness: 35 m Current trace width: 1.60 mm PCB total thickness: 1.62 mm FIGURE 3 MAGNETIC FIELD (T) VS. DISTANCE FROM CURRENT TRACE Board Measurements This section summarizes the results of several practical measurements. The power supply is fixed to 3.0 V. Gain from PCB Trace to TMR: 95 T/A 2019 Crocus Technology 2 Document : CTD110 User Guide Rev0.2