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Author Topic: How to find out what voltage is needed for a circuit?  (Read 830 times)

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Offline symbianasTopic starter

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How to find out what voltage is needed for a circuit?
« on: February 03, 2021, 07:30:25 pm »
Hi, I want to power BMW DSC sensor on my test bench, but don't know how much volts it requires.





How could I find voltage value needed? Is it possible that it is powered by regular +12V? Or it should be less?
Should I try to power it from low voltages and go up to see when its working?
What power supply voltages are common for car sensors?
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Offline CaptDon

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Re: How to find out what voltage is needed for a circuit?
« Reply #1 on: February 03, 2021, 07:40:09 pm »
Where is the rest of the diagram? It surely has more than two wires? Is it CANBUS powered?
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Offline symbianasTopic starter

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Re: How to find out what voltage is needed for a circuit?
« Reply #2 on: February 03, 2021, 08:27:08 pm »
Quote from: CaptDon on February 03, 2021, 07:40:09 pm
Where is the rest of the diagram? It surely has more than two wires? Is it CANBUS powered?

Yes, its connected to F-CAN by 2 wires. In total DSC sensor has 4 wires: Ground, F-CAN+, F-CAN-, Supply. Supply wire is marked as 0.5mm2 thickness.



Power supply of whole DSC unit:
« Last Edit: February 03, 2021, 08:58:14 pm by symbianas »
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Offline symbianasTopic starter

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Re: How to find out what voltage is needed for a circuit?
« Reply #3 on: February 04, 2021, 03:08:03 pm »
Should I try to power it from low voltages and go up to see when its working? Or is there any better way?
Does the information that module is using CAN BUS suggests its power supply voltage?
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Offline CaptDon

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Re: How to find out what voltage is needed for a circuit?
« Reply #4 on: February 04, 2021, 03:19:41 pm »
Our CANBUS sensors on GE/WABTEC locomotives are powered from +15vdc although they are simply automotive sensors which were used on cars at 12vdc. I think the BOSCH manufacturer spec says they will work accurately anywhere from 8vdc to 20vdc.
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Offline symbianasTopic starter

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Re: How to find out what voltage is needed for a circuit?
« Reply #5 on: February 05, 2021, 05:06:40 pm »
I took apart the sensor, sadly it had tough plastic and I have damaged the board parts. But I am still interested to know what voltage it needs (If I will buy another sensor) so here its internals:

GFE 5BA - diode ?
TMS 980 - some kind of MCU by ATE
5CT D47Y - some kind of chip ?
A476C - capacitor 16V
L4P 22 35V - capacitor
551 U1D
25LC040 - eeprom

Can this suggest the Voltage required?


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Offline mvs

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Re: How to find out what voltage is needed for a circuit?
« Reply #6 on: February 05, 2021, 05:45:08 pm »
GFE with general semiconductor logo is SMCJ26A 26V TVS diode, so this DSC sensor is made for "12V" board supply.
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