MAX22191EVKIT# Analog Devices

Click here for production status of specific part numbers. MAX22191 Evaluation Kit Evaluates: MAX22191 General Description Quick Start The MAX22191 evaluation kit (EV kit) is a fully assembled Required Equipment and tested circuit board that demonstrates the functionality MAX22191 EV kit of the MAX22191 digital input in an optical isolator circuit. 24V Digital signal generator The EV kit features two circuits: one for a 24V digital input signal and one for a 48V input signal. Oscilloscope Startup Procedure Features The EV kit is fully assembled and tested. Follow the steps 24V and 48V Circuits for Easy Evaluation below to verify board operation: Proven PCB Layout 1) Ensure that the jumpers are in the default position Fully Assembled and Tested (Table 1). 2) Connect the digital signal generator to the IN+ test point (TP3) and IN- test point (TP4). Ordering Information appears at end of data sheet. 3) Connect the oscilloscope to the IN+ test point (TP3), and the OUT (TP14) test point. Connect return terminals to the IN- test point (TP4) 4) Set the digital signal generator to generate a 0V 24V 2kHz pulse. 5) Turn on the digital signal generator. 6) Monitor the IN+ and OUT signals. Verify that the OUT signal toggles as expected. 319-100170 Rev 0 3/18MAX22191 Evaluation Kit Evaluates: MAX22191 Testing the MAX22191 as a Current Sourcing Detailed Description of Hardware Input The MAX22191 EV kit is a fully assembled and tested circuit board for evaluating the MAX22191 The MAX22191 EV kit can be used to evaluate the device digital input (DI) with either a 24V or 48V input. in either a current sinking or current sourcing configuration. Powering the MAX22191 EV Kit To test the MAX22191 as a current sourcing input, connect the proximity sensor/switch to the negative terminal The MAX22191 can be powered parasitically, from the of the 24V or 48V supply. Connect the positive terminal of signal on IN, or from a local V supply. To power the CC the supply to to the IN+ test point (TP1 or TP3) or terminal circuit parasitcally, ensure that the V jumper is set to CC block (J1 or J2) on the EV kit. Connect the negative/return LOW (J9 or J10 is 2-3) and apply a digital input signal to terminal of the sensor/switch to IN- test point (TP2 or TP4) IN+. or terminal block (J1 or J2). To power the circuit from a local power supply, connect the V jumper to TP (J9 or J10 to 1-2) and apply a 3V Evaluating the MAX22191 with an Optical CC to 5.5V supply to the V test point. Isolator (V = 0V) CC CC The MAX22191 includes an on-board high-speed optical Selecting the Test Circuit (24V or 48V) isolator for easy evaluation. To use the optical isolator, set The MAX22191 EV kit supports 0-24V or 0-48V digital V = 0V (J9 or J10 to 2-3) and connect an isolated supply CC input (DI) signals. These circuits are clearly labeled on between 2.7V and 5.5 to the V test point (TP9 or TP11) DD the silkscreen. on the isolated side of the board. Connect an oscillopscope In the 48V circuit, R1 and R2 are using to shift the input to the VO test point (TP10 or TP12) to see the output of the voltage, such that the IEC 61131-2 thresholds are met for isolator switch as the input signal (IN+) switches. a 48V input signal. Additionally, R1 limits surge current, Evaluating the MAX22191 with an Optical allowing for a higher voltage TVS clamp on the input. Isolator (3V V 5.5V) CC Apply the digital input (DI) signal to the J1 terminal block OUT is a push-pull buffered output when V is present. CC when using signal voltages above 30V. Apply the DI Remove the R13 or R15 resistor and connect a resistive signal to the J2 terminal block when using signal voltages load to R9/R10 to test functionality in this mode. below 30V. Testing the MAX22191 as a Current-Sinking Input The MAX22191 EV kit can be used to evaluate the device in either a current sinking or current sourcing configuration. To test the MAX22191 as a current sinking input, connect the proximity sensor/switch to the IN+ test point (TP1 or TP3) or terminal block (J1 or J2) on the EV kit. Connect the negative/return terminal of the sensor/switch to positive output of the 24V or 48V supply. Connect the return terminal of the supply to the IN- test point (TP2 or TP4) or terminal block (J1 or J2). Maxim Integrated 2 www.maximintegrated.com