INA260: request for schematic review.

Hi, I can't see any reverse polarity protection in this design. Isn't it a common practice to use a diode in VBUS pin? Kindly review this matter. https://electronics.stackexchange.com/questions/710311/is-a-diode-really-necessary-when-exposing-usb-vbus-as-a-pin-on-a-dev-board   https://www.pcbway.com/blog/25/ESD_Protection_and_Reverse_polarity_protection.html 

Dear Mohamed

Please check the parts that need to be corrected.

 - VBUS pin monitoring power supply (36V, 27V, 5.0V, 3.3V)

 - IN+ GND connection (PIN_#1,2,3)

Please explain in detail what needs to be changed in the circuit.

Additional inquiries

If the 3.3V GND driving the IC and the GND of the monitoring power are different, should the IC GND be used as the monitoring GND? Or should I use GND driving the IC?

ex) IC supply power GND: GND
      IC monitoring power GND: GND-ISO

At this time, what kind of GND of the IC do you use?

GND??? GND-ISO???

Additional inquiries

Robin Is it possible to use 3.3V IC power in the circuit provided and connect 5V or 3.3V power monitoring power supply to VBUS and IN+ Pin_#1,2,3?

Conditions for not using 27V, 36V.

Please respond to two inquiries.

The circuit is urgently needed. ARTWORK progress is being delayed due to the circuit being slow.

We ask for your understanding and please confirm quickly.

HI Sang, 

sang rok song said:

 - VBUS pin monitoring power supply (36V, 27V, 5.0V, 3.3V)

 - IN+ GND connection (PIN_#1,2,3)

You would need to tie IN+ and IN- together, and to GND if they are not being used. The GND could be the same system GND that you are using to power the IC. 

sang rok song said:

Robin Is it possible to use 3.3V IC power in the circuit provided and connect 5V or 3.3V power monitoring power supply to VBUS and IN+ Pin_#1,2,3?

Conditions for not using 27V, 36V.

I'm not sure I understand this question, Do you mind clarifying please? 

Best,

Mohamed 

Dear Mohamed 

The attached circuit diagram is a circuit for monitoring 5V and 3.3V power.

In the same circuit, the power monitoring power is 5V and 3.3V, and each SLAVE ADDRESS is assigned.

What you requested: IN+ PIN_#1,2,3 / IN- PIN_#14,15,16 GND connected. (PIN VBUS Monitoring Power Connection)

Please confirm whether the 5V, 3.3V circuit diagram provided can be used to fix it.

If there is anything that needs to be corrected, please provide details on which part needs to be corrected and how.

Thank you for your cooperation.

Regards

srsong

Dear Mohamed 

In the circuit diagram provided

A0: MLCC
ALERT: MLCC

I will delete it.

Please confirm again.

Requested information: IN+ PIN_#1,2,3 / IN- PIN_#14,15,16 GND is connected. (PIN VBUS monitoring power connection)

We will proceed under these conditions.

There’s nothing wrong, right?

Dear Mohamed 

Additional inquiries

Monitoring power 5V VBUS connection GND-ISO External GND used

IC power internal GND used

Is the GND setting correct?

Hi Sang, 

What is the differential between the 5V VBUS connection and the GND-ISO external GND? 

Dear Mohamed 

Please ignore the GND part.

Please final check the circuit connection and time constant value.

To be deleted

A0: MLCC
ALERT: MLCC

Are the CLK and SDA resistances 49.9ohm?

Dear Mohamed

We will proceed with the final circuit provided. 

1. There is nothing that needs to be modified or changed, right?

2. F/U resistance 10K SCL, SDA, ALERT was applied.

3. Is there a reason to use SCL, SDA damping resistance of 49.9ohm?

 - If there is no reason, can I apply 0 ohm?

I would like to ask you to answer each of the three questions.

Dear Mohamed

Mohamed ) 1. Everything seems fine other than those resistors on the I2C lines

srsong) Are you talking about I21C Lines 49.9ohm? This is the value applied to the received reference board.

             If the resistance value of the I2C line is a problem, I will set it to 0 ohm.

Other than this, I understand there are no problems. Do you agree?

Dear Mohamed

I would like to inquire further.

The 27V, 36V circuits were implemented in the same way as the 5V, 3.3V monitoring circuits.

Slave addresses will be allocated separately.

Please check whether there are any abnormalities in the two circuit diagrams: 27V and 36V.

The IC specifications were confirmed to be up to 40V.

Dear Mohamed

Senses Bus Voltages From 0 V to 36 V,

VBUS specifications are up to 40V.

Is there any reason to be careful not to exceed 36V?

We need to monitor 36V power.

Please reply quickly.

Thank you always for your quick replies.