MLX90615

MLX90615Infra Red Thermometer11.3 PWM outputWith PWM output configuration MLX90615 can be read via single wire. Output is open drain NMOS (with aweak pull-up, 300 kΩ typ). Therefore external pull-up is required for high level state on the line with longerwires. Simple level shifting is possible with a single resistor. ESD protective clamp on the SDA pin consists of4 diodes to Vdd, thus allowing high level to go up to 5V disregarding the MLX90615 supply voltage value.+3V+Vdd22Vdd1SCL SDA3C1U1Vss MLX906150.1uF 4R110kVddMCUPWM CaptureVssC2+Vdd2 may be +1.8...+5Vaccording to the MCUusedFigure 20: Using MLX90615 PWM outputIn EEPROM two PWM periods can be programmed – 102.4 or 1 ms (typ). With remote installation (wires)PWM is recommended as more robust to EMI than the SMBus and the high PWM period would be alsopreferred. As a factory default, once PWM is enabled, output will cover 0…50°C object temperature range (as12.5 … 62.5% duty cycle) at 1kHz frequency.3901090615 Page 23 of 30 Data SheetRev 00128/Aug/2008