ISO1228: judgement the input voltage

Chen Alex1

Expert 2965 points

Part Number: ISO1228

Tool/software:

hi Sir

may i know how to set up the VIH, VIL by firmware or hardware?

spec : VIH : 15V, VIL :10V,

VIH : input over 15V , LED ON

VIL : input under 10V , LED OFF

thanks

0 Andrew Jackiw 1 month ago

Hello Alex,

The VIH and VIL of ISO1228 are set by hardware resistors on the PCB.

Please see threshold resistor design process at 8.2.3.1.2 Voltage Thresholds.
Please see threshold calculator here https://www.ti.com/tool/download/ISO1228-CALC
LEDx will turn the LEDs on and off at the VIH and VIL thresholds set by the application's hardware.

Best,
Andrew

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