Power supply of s32K144

[ankan_creatara]

Hello Everyone, 
I am back with some more queries. Please help me out.

In the overall schematic, and as far as I can understand; the S32K144EVB can be powered up in two ways:
1. 12V supply (external)
2. 5V from Micro-USB

Please correct me if I am wrong!!

Whenever an external 12V supply is used, the power flows through the SBC UJA1169, right? When I was exploring the UJA1169, I found out two pins in the chip: 
1. Pin 5: V1
2. Pin 14: BAT

As I can see, V1 can be of 5V or 3.3V. Whereas BAT is the battery Voltage, which is of 5V. But, I could not find any port to connect the 12V from the external supply. Am I understanding the circuit correct? OR am I missing out something?

Please help me in figuring out,
A. How can I use an external 12V supply to power up the S32K144EVB. Is it even possible to use the 12V supply or Do I need to use any 5V source?
B. What is the voltage at which the entire board works? Is it 12V or 5V or 3.3V?

Thank you for your time. 

[Robin_Shen]

Hi ankan_creatara,

BAT is the battery Voltage, it connect the 12V from the external supply.

A. You can connect the 12V supply at J16
B. 5V, but J10 can select P3V3 for VDD

Best Regards,
Robin
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[ankan_creatara]

Hi @Robin_Shen 

Thank you for your insight. I really appreciate your help. 

So, does that mean that, even if I give 12V supply to the board, the chips will bring the voltage down to either 5V or 3.3V to operate?

If so, then what is the need of supplying 12V? We can simply provide the necessary 5V to the board. 

Could you kindly guide me, as to what would happen if I supply 5V to VDD?

Please help me out with this issue.

Thank you for your time. 

P.S.: In the board, nothing is connected to J10. No port/pin is connected. Even though PCB routing is there, physical pins are not connected. Why is that? Since, we cannot physically choose as to how to use this J10 port; what is the use of this J10 port? I have attached the screenshot of the same for your kind reference.

[Robin_Shen]

When you give 12V supply to the board(J16), the UJA1169TK/F bring the voltage down to 5V(V1 pin 5), and U15 bring 5V down to 3.3V.

If so, then what is the need of supplying 12V? We can simply provide the necessary 5V to the board. 

Some application need high voltage, for example CAN and FLEXIO UART. For more detail, you can search J16 in S32SDK_S32K144_UserManual.pdf

J10 and R63 are DNP on S32K144EVB, R64 is solder. So P5V0 is connect to VDD by default. If customer want to use P3V3 power S32K144, hardware change is needed by them self.

[ankan_creatara]

Hi @Robin_Shen 

Thank you for your support.

Could you kindly help me differentiate the following:
1. VBAT
2. VSUP
3. VIN


I am attaching the screenshot for your reference. 

Thank you for your time.

[Robin_Shen]

1. You can find the description about VBAT in S32SDK_S32K144_UserManual.pdf(C:\NXP\S32DS_ARM_v2.2\S32DS\software\S32SDK_S32K1xx_RTM_3.0.0\doc)

2. Please refer to the discussion: LIN Break Detect Interrupt not getting detected in S32K

3. You can find there are two VIN pin at J3. (provide additional power supply way)

[ankan_creatara]

Hi @Robin_Shen ,

Thank you for your support.

Could you kindly help me find the sources of the following? I want to know, from where exactly can I obtain the following voltages:
1. P5V_SBC (System basic chip)
2. P5V_SDA_PSW 
3. P3V3_SDA (Serial Debug Adapter)

I want to know the difference of any 5V and 3.3V supply with the above SDA/SBC specific supply.

Thank you for your time.

[Robin_Shen]

Please download the S32K144EVB-SCH-29248-RB1 , searching them will find the sources:

P5V_SBC is output from U19

P5V_SDA_PSW is from U11

P3V3_SDA  is from SDA_VOUT33

[ankan_creatara]

Hello @Robin_Shen ,

Thank you for your support.

Could you please help me understand the difference between:
1. P5V0
2. P5V_SDA
3. P5V_SDA_PSW
4. P5V_SBC

Thank you for your time. 

[Robin_Shen]

P5V0 select P5V_SDA_PSW(USB) or P5V_SBC(external 12v) power the system by J107

P5V_SDA is control by OpenSDA to enable the output of P5V_SDA_PSW(If OpenSDA application is not running, then the POWER_EN disable the P5V_SDA_PSW)