Thresholds at the Inputs can be set by changing RTHR value. The equation and explanation are in datasheet. The ISO1228 calculator works on these equations.
The Internal Surge Protection is functional only in sink mode. The internal ESD structures can take current up to 1A and Voltage clamp at around 42V. Hence, if RTHR is surge proof resistor then surge protection is achieved without any additional Protection…
Yes, the voltage at INx channels on field side can be higher than AVCC Supply. The Max Value for AVCC = 36V. INx can never be greater than 36V. The device can handle and INx = AVCC +36V so long as 36V itself is not exceeded.
No, it cannot.
The device can only support either sink or source mode at a time. Data will not be transmitted to the output side, if all the 8 channels are not connected in same mode.
Part Number: ISO1228 hi SIR
In source type, need a RlLim between the AVSS & Field
the AVSS in pin 7 ,pin 17,
i need to short the Pin 7,Pin 17 and series a R to Ground?
i worry about the thermal
another question is how current output per ch in source…
Part Number: ISO1228 hi SIR
I want to design a DI module, which use 32 ch DI, so need 4 pcs ISO1228,
May I know how to set up the HW circuit?
thanks
if i don't need the LED, should floating the part? or short whether source or sink mode
how to set…
Part Number: ISO1228
Tool/software:
Hello All,
What is the nominal value of the Outx pin current? I see in the absolute ratings Io is +/- 15mA. But I don't see any recommended current levels for the output pins in parallel mode. Just curious if I can…
Hello Alex,
ISO1228 can operate without LED/diode in both sink and source mode but the wire break detection will not be available. “The LEDx pins can be connected directly to GND in sink mode provided wire-break detection is not used and V24V in source…
Sinking type: All the LEDx pins need to be <3V. Hence, LEDx pins are connected to GND via LED with drop up to maximum of 3V.
Sourcing Type: All the LEDx pins need to be >3V. Hence, LEDx pins are connected from AVCC through LEDs.