TPS767D3: Any questions about using TPS767D301 and WSON6 Package LDO for the power source of TMS320F28388D

Hi Kim, 

Please allow 2 business days for me to answer all your questions. I will get back to you by Friday. 

Regards, 
Jason

Hi Song,

What are the 2 business that I will allow?

Regards,

Seongdae

Seongdae, 

Sorry, it's a typo, I meant to say "two business days". 

Regards, 
Jason

Hi Seongdae, 

Please see my comments below your questions. 

1. Is it possible that TPS767D301’s inner first LDO’s output is applied as power source of TPS767D301’s inner second LDO?

If the method is not possible, I want to know the reasons.

--You could have one TPS767D301 connected to the output of another TPS767D301, as long as there is enough headroom for both LDOs, it will be fine.

2. In 2000 year’s datasheet, the TPS767D301’s minimum output is 1.8V.

    But in 1999 year’s datasheet, the TPS767D301’s minimum output was 1.2V.

    When I tested, it was possible that 1.2V is outputted from TPS767D301.

I wish to know the reason you announced that the TPS767D301’s minimum output is 1.8V.

--I tried, but I could not identify the exact reason for the change. It could be driven by certain test change or market repositioning. But for adjustable LDO, the lowest output voltage is the reference voltage, and for this LDO, you could get 1.2V when the FB pin is connected to the output pin.

3. If it is possible that on the TPS767D301 the its inner first LDO’s output can be the its inner second LDO’s input and TPS767D301 can outputs 1.2V,

    I would like to configure as follow.;

    For the power source of TMS320F28388D, I supply 5V to the first LDO of TPS767D301 and 3.3V output of the first LDO is connected to the second LDO’s input.

    The  TPS767D301's second LDO’s output 1.2V of is used for the TMS320F28388D’s VDD.

    The TPS767D301's first LDO’s output 3.3V is used for the TMS320F28388D’s VDDIO, VDDA, VDD3VFL, VDDOSC and the another circuits(Max. 124mA).

Is this method is possible? If not possible, I wish to know the reasons.

--Yes, this configuration should work.

4. Although it is possible that on the TPS767D301 the its inner first LDO’s output can be the its inner second LDO’s input, if TPS767D301 can not outputs 1.2V,

    I would like to configure as follow.;

    For the power source of TMS320F28388D, I supply 5V to the first LDO of TPS767D301 and 3.3V output of the first LDO is connected to the second LDO’s input.

    The  TPS767D301's second LDO’s output 1.8 or 1.9V is used as input of the another LDO which outputs 1.2V for TMS320F28388D’s VDD.

    The TPS767D301's  first LDO’s output 3.3V is used for the TMS320F28388D’s VDDIO, VDDA, VDD3VFL, VDDOSC and the another circuits(Max. 124mA).

Is this method is possible? If not possible, I wish to know the reasons.

--Since you could use TPS767D301 for 1.2V output, you could go with the previous configuration if it works better for you. But since the datasheet specification is only for the output voltage higher than 1.5V, you could go with a different LDO that outputs 1.2V.
    
5. The 1.2V output LDO mentioned in the 4'th paragraph above was selected as follows.

     Is there any problem with selection?  

     TPS745, TLV758P, TPS746, TLV759P, TPS7A11, TPS745-Q1, TPS746-Q1, TPS7A90, LP5912-Q1, LP5912, TLV755P, TLV757P

     WSON6 Package

--Yes, you could pick those adjustable or fixed LDO for 1.2V output.

6. Can the LDOs mentioned in the 5'th paragraph above be used as power source for DSP including TMS320F28388D?

    There are colleagues who are concerned about using the LDO mentioned in the 5'th paragraph above because the DSP is not mentioned in the Applications of the LDOs' data sheets.

    If the DSP is not mentioned in the datasheet's Applications of any LDO, can't the LDO be used as a power source for the DSP?

If not possible for use, I wish to know the reasons.

--I don’t see a reason you could not use LDO to power DSP. The typical applications are prepared as examples for some of the applications, but they are not limited to the ones listed.

7. After using all he TPS767D301, which is left a lot, we wish to change the design of the DSP power circuit at a lower price.

    Would you like to recommend a power circuit for TMS320F28388D that can be used up to 90℃ while having a small number of parts, a small space, a low total price?

Of course, the power circuit should be able to supply up to 124mA to the external circuit of  the TMS320F28388D.

--If I understand you correct, for this stage, you were looking for a 3.3V to 1.2V conversion with a 124mA load current, is this correct?

Regards, 
Jason

Hi Jason

Thank you for your reply.

I put any additional questions below your answers.

1. Is it possible that TPS767D301’s inner first LDO’s output is applied as power source of TPS767D301’s inner second LDO?

If the method is not possible, I want to know the reasons.

--You could have one TPS767D301 connected to the output of another TPS767D301, as long as there is enough headroom for both LDOs, it will be fine.

Additional question:

 According your answers to another questions below, it seems no problem that I configure the power circuits of TMS320F28388D using only one TPS767D301 and SWON package LDO.

 But your answer to this questions is confusing because you suggested using two TPS767D301.

 Do you suggest the using two TPS767D301 because the my configuration using only one TPS767D301 is wrong?

2. In 2000 year’s datasheet, the TPS767D301’s minimum output is 1.8V.

    But in 1999 year’s datasheet, the TPS767D301’s minimum output was 1.2V.

    When I tested, it was possible that 1.2V is outputted from TPS767D301.

I wish to know the reason you announced that the TPS767D301’s minimum output is 1.8V.

--I tried, but I could not identify the exact reason for the change. It could be driven by certain test change or market repositioning.

  But for adjustable LDO, the lowest output voltage is the reference voltage, and for this LDO, you could get 1.2V when the FB pin is connected to the output pin.

Additional question:

Do you say that I can get 1.2V(exactly 1.1834V) by the connecting the FB pin to output pin without the divide resistors on the TPS767D301 according to the formula below.

In TPS767D301’s datasheets, even if it is declared that TPS767D301’s adjustable output range is 1.5V to 5.5V, do you say that customers can use it by outputting 1.18V according to the following formula?

3. If it is possible that on the TPS767D301 the its inner first LDO’s output can be the its inner second LDO’s input and TPS767D301 can outputs 1.2V, I would like to configure as follow.;

   For the power source of TMS320F28388D, I supply 5V to the first LDO of TPS767D301 and 3.3V output of the first LDO is connected to the second LDO’s input.

    The  TPS767D301's second LDO’s output 1.2V of is used for the TMS320F28388D’s VDD.

    The TPS767D301's first LDO’s output 3.3V is used for the TMS320F28388D’s VDDIO, VDDA, VDD3VFL, VDDOSC and the another circuits(Max. 124mA).

Is this method is possible? If not possible, I wish to know the reasons.

--Yes, this configuration should work.

Additional question:

Are you saying that your answer to this question is that my configuration have not a problem?

I don't exactly know the meaning that you say "this configuration should work.".

When answering this question, is did you answer about the configuration using only one TPS767D301?

My configuration in this question.

4. Although it is possible that on the TPS767D301 the its inner first LDO’s output can be the its inner second LDO’s input, if TPS767D301 can not outputs 1.2V,

    I would like to configure as follow.;

    For the power source of TMS320F28388D, I supply 5V to the first LDO of TPS767D301 and 3.3V output of the first LDO is connected to the second LDO’s input.

    The  TPS767D301's second LDO’s output 1.8 or 1.9V is used as input of the another LDO which outputs 1.2V for TMS320F28388D’s VDD.

    The TPS767D301's  first LDO’s output 3.3V is used for the TMS320F28388D’s VDDIO, VDDA, VDD3VFL, VDDOSC and the another circuits(Max. 124mA).

Is this method is possible? If not possible, I wish to know the reasons.

--Since you could use TPS767D301 for 1.2V output, you could go with the previous configuration if it works better for you. But since the datasheet specification is only for the output voltage higher than 1.5V, you could go with a different LDO that outputs 1.2V.

Additional question:

When answering this question, is did you answer about the configuration using only one TPS767D301?

Is “the previous configuration” in your answer the configuration I mentioned in the 3’d paragraph above?

My configuration in this question.

5. The 1.2V output LDO mentioned in the 4'th paragraph above was selected as follows.

     Is there any problem with selection?  

     TPS745, TLV758P, TPS746, TLV759P, TPS7A11, TPS745-Q1, TPS746-Q1, TPS7A90, LP5912-Q1, LP5912, TLV755P, TLV757P

     WSON6 Package

--Yes, you could pick those adjustable or fixed LDO for 1.2V output.

Additional question:

Are LDOs(TPS745, TLV758P, TPS7A11, TPS745-Q1, TPS7A90, LP5912-Q1, LP5912, TLV755P) with a maximum output current of 500 mA appropriate for the 1.2 V power source of TMS320F28388D?

TMS320F28388D’s VDD(1.2V) current max consumption is 475mA and 56Ω resistor’s current consumption is 21mA. 56Ω resistor is mentioned in the Signal Description section of TMS320F28388D’s datasheets.

Do you think these LDOs are enough for TMS320F28388D's VDD source without any margin?

In the case of TLV755P and TLV757, if considering the Vdo(Dropout voltage), is there usage no problem?

6. Can the LDOs mentioned in the 5'th paragraph above be used as power source for DSP including TMS320F28388D?

    There are colleagues who are concerned about using the LDO mentioned in the 5'th paragraph above because the DSP is not mentioned in the Applications of the LDOs' data sheets.

    If the DSP is not mentioned in the datasheet's Applications of any LDO, can't the LDO be used as a power source for the DSP?

If not possible for use, I wish to know the reasons.

--I don’t see a reason you could not use LDO to power DSP. The typical applications are prepared as examples for some of the applications, but they are not limited to the ones listed.

Additional question:

For example of TPS746, its datasheets’ first page have its Applications as follow;

Even though the Applications don’t include the usage of DSP, do you say that the TPS746 can use for DSP?

7. After using all he TPS767D301, which is left a lot, we wish to change the design of the DSP power circuit at a lower price.

    Would you like to recommend a power circuit for TMS320F28388D that can be used up to 90℃ while having a small number of parts, a small space, a low total price?

Of course, the power circuit should be able to supply up to 124mA to the external circuit of  the TMS320F28388D.

--If I understand you correct, for this stage, you were looking for a 3.3V to 1.2V conversion with a 124mA load current, is this correct?

Additional explains for my question:

I am looking for conversion circuits and components from 5V to 3.3V and 1.2V.

3.3V is used for the TMS320F28388D’s VDDIO, VDDA, VDD3VFL, VDDOSC and the another circuits(Max. 124mA) out of the TMS320F28388D.

1.2V is used only for the TMS320F28388D’s VDD.

Regards,

Seongade

Hi Seongade,

Sorry for the late response as I was on time off last week, and just returned today.

To better help with all your questions, do you think you would be available for a WebEx meeting? 

Regards, 
Jason Song

Hi Jason

Thank you for your reply and suggesting Webex meeting to explain about my questions.

But I’m sorry. I would like to receive your text reply because I can only read English.

Best regards,

Seongdae

Hi Seongdae, 

Let me read through your questions again, and I will try to provide the answers here.  Please allow 2 business days for me to review all your questions and provide my comments. 

Thank you, 

Jason

Hi Seongdae, 

Instead of providing answers to all your 7 questions, let's get started on one at a time. 

1. Is it possible that TPS767D301’s inner first LDO’s output is applied as power source of TPS767D301’s inner second LDO?

I am not sure if I understand you correctly on the term of "inner" LDO. I am assuming you are asking whether an application can have one LDO after another. The answer for this one is Yes, you may create multiple middle stages. For example, you could have your first LDO doing a voltage convertion from 5V to 3.3V, and the second LDO from 3.3V to 1.2V. As long as you pick the right LDOs, there is no problem. 

Is this what your question is? 

Regards, 
Jason

Hi Jason

I'm sorry to confuse you.

The circuit below shows my question well, so please refer to it.

Now do you understand my question?

Best regards

Seongdae.

Hi Seongdae, 

Thanks for your clarifications, and yes since TPS767D3 has two LDOs packed into one package, it's not common but you should be able to use the output from one of the LDO as the input for the other LDO in the same package. 

Let's move to your 2nd question:

1. Do you say that I can get 1.2V(exactly 1.1834V) by the connecting the FB pin to output pin without the divide resistors on the TPS767D301 according to the formula below.

Since the FB voltage is 1.2V, technically, you could have an output option down to FB voltage for most of the LDOs. However, since the datasheet explicitly lists 1.5V as the lowest output, we cannot recommend a solution outside of the datasheet recommendation. You will need to take your own risk by using the part outside of the datasheet condition. 

Regards, 
Jason

Hi Jason

Thank you for your kind explanation.

The TPS767D301’s minimum output was 1.2V in 1999 year’s datasheet, but now not recommended, so I wonder what problems can be occurred when using 1.2V.

Best regards

Seongdae.

Hi Seongdae, 

As we can see, the device has a long history, and I understand one of the old datasheets has the output voltage listed as 1.2V, but we can only provide application recommendations based on the latest datasheet revision. The reason for the change could be driven by market repositioning or certain test changes. If you have a concern about using the device at 1.2V which is outside of datasheet limit, I would suggest you consider other devices that do offer an output voltage of 1.2V. Do you think you could change this device to another device? 

Regards, 
Jason

Hi Jason

If TI not recommend the using of TPS767D3 at 1.2V which is outside of datasheet limit, I will not use this device at 1.2V during mass-production.

But I wish to know what problems can be occurred when using 1.2V.

The our board is presently composed by TMS320F28335. I would like to change DSP used on the our board by TMS320F28388D.

And I would like to continuously use the TPS767D301 because we have to use all the many remained TPS767D301 during mass production of the board after changing DSP.

We wish to use the board up to the max ambient temperature 90℃.

In this situation, Could you suggest any solutions for following cases?

Case 1. I would like to add a LDO of less than $0.5 in a very small size for 1.2V to the output end of TPS767D301 while continuing to use TPS767D301.

What are the appropriate LDOs available in this case?

Case 2. What device of the same package and pin configure will replace TPS767D301 in the above case1.

Case 3. I would like to select dual LDO that can output 1.2V in the same package and pin configure as TPS767D301.

Case 4. Regardless of TPS767D301, I would like to configure an appropriate power circuit with a low price and a small number of parts for TMS320F28388D.

Best regards

Seongdae.

Hi Seongdae, 

We are looking into the solutions as you requested, and we will get back to you soon. 

Regards, 
Jason 

Hi Jason

Thank you for your replies.

1. Is the configuration below what you are suggesting for my application?

What is the input voltage of the TLV755P you have reviewed?

Can this configuration be used in environments with a ambient temperature of 90 ºC under CFM value 0?

2. Is the configuration below what you are suggesting for my application?

Could you reconsider this configuration because this configuration's 3.3v current is more than the value of TPS751’s spec..

Can this configuration be used in environments with a ambient temperature of 90 ºC under CFM value 0?

3. Are the configurations below what you are suggesting for my application?

Can these configurations be used in environments with a ambient temperature of 90 ºC under CFM value 0?

4. Could you suggest a configuration same as above that can be used for TMS320F28388D in environments with a ambient temperature of 90 ºC under CFM value 0 using the TLV767.

5.  Could you reconsider TPS7A25 because TPS7A25’s output current is lower than my application’s current consumption.

    If I am wrong, could you correct my mistakes?

Best regards

Seongdae.

Hi 

1. Is the configuration below what you are suggesting for my application? 

Yes, this is one of the options for your application. 

What is the input voltage of the TLV755P you have reviewed?

I would budget 2V for the input of the TLV755p if possible. 

Can this configuration be used in environments with a ambient temperature of 90 ºC under CFM value 0?

Please see the 8.1.5.1 Estimating Junction Temperature in the datasheet for thermal calculation. 

2. Is the configuration below what you are suggesting for my application?

Yes, this configuration would work. If  you need higher than 500mA of current from each channel, you may consider TLV752, which is the 1A version of TLV751. 

3. Are the configurations below what you are suggesting for my application?

Yes, TPS7A87 can also work in this manner. 

4. Could you suggest a configuration same as above that can be used for TMS320F28388D in environments with a ambient temperature of 90 ºC under CFM value 0 using the TLV767.

Since you asked the thermal question on every configuration, I will explain at the end of this message. 

5. Could you reconsider TPS7A25 because TPS7A25’s output current is lower than my application’s current consumption.

    If I am wrong, could you correct my mistakes? TPS7A25 is rated for 300mA, and if you need more current, I would consider other options. 

For the thermal, you may refer to the Rja number listed under thermal metrics of each datasheet, and then you may calculate the junction temperature rise using 

Tjunction = Tambient + Rja x Power Dissipation 

The power dissipation is (Vin-Vout) x Load Current. For dual channels, you will need to add the Pd from both channel. 

Regards, 
Jason Song

Hi Jason

Thank you for your replies.

You seem to think I want a current of more than 300mA but it's not.

I wanted to ask if you have reviewed the parts selection considering the maximum current required on the data sheet of TMS320F28388D.

I already knew the formula for the heat you mentioned. But when I applied the formula for the parts you selected, I did not seem to fit my application.

Please check if my calculation is correct.

1.

   For TPS767D301

       Pdmax = [(5 - 3.3) x (0.06 + 0.054)] +[(5 - 2) x (0.475 + 0.021)] = 1.682W

       Tamax = Tjmax –Rja x Pdmax = 125 – 27.9 x 1.682 = 78.1°C

   For TLV755P

       Pdmax = (2 – 1.2) x (0.475 + 0.021) = 0.397W

       Tamax = 125 – 100.2 x 0.397 = 85.3°C

   As these results, this configuration is not fit to my application with a ambient temperature of 90 ºC under CFM value 0.

   Did I miss anything or did anything wrong in the process of reviewing the heat and the power dissipation?

2.

   Pdmax = [(5 – 3.3) x (0.06 + 0.054 + 0.475 + 0.021)] + [(3.3 – 1.2) x (0.475 + 0.021)] = 2.08W

   Tamax = 125 – 74.6 x 2.08 = -30.1°C

   As these results, this configuration is not fit to my application with a ambient temperature of 90 ºC under CFM value 0.

   Did I miss anything or did anything wrong in the process of reviewing the heat and the power dissipation?

3.

 1)

    Pdmax = [(5 – 3.3) x (0.06 + 0.054)] + [(5 – 1.2) x (0.475 + 0.021)] = 2.08W

    Tamax = 125 – 74.6 x 2.08 = -30.1°C

    As these results, this configuration is not fit to my application with a ambient temperature of 90 ºC under CFM value 0.

    Did I miss anything or did anything wrong in the process of reviewing the heat and the power dissipation?

2)

    Pdmax = [(5 – 3.3) x (0.06 + 0.054)] + [(5 – 1.2) x (0.475 + 0.021)] = 2.08W

     Tamax = 125 – 33 x 2.08 = 56.27°C

    As these results, this configuration is not fit to my application with a ambient temperature of 90 ºC under CFM value 0.

    Did I miss anything or did anything wrong in the process of reviewing the heat and the power dissipation?

Best regards

Seongdae.

Hi Seongdae,

The max currents listed in the F28388D's datasheet e.g IDDMAX=475mA is not the absolute max current you can experience on the F28388 device, this is mentioned in the intro paragraph to the table. In addition, that current is a steady state current and does not account for transients.

With that in mind when you are choosing a PMIC, it's recommended to go with at least 2x the current requirement. Let us know if this is not clear.

Hi Frank

If I use TMS320F28388D under the below condition, could you tell me the requirement current you mentioned on your reply?

<H/W conditions>

-. GPIO 30EA

-. EMIF Address 16bit, EMIF Data 16bit

-. EPWM 3channels

-. ADC module 1EA

-. SCI module 2EA

-. CAN module 1EA

-. USB module

-. EQEP module 1EA

-. External oscillator 20Mhz

<S/W condition>

-. Assume the use all area of the inner Flash and RAM

-. Assume the use all the available function of the TMS320F28388D in relation to the above H/W

Do you need another condition for calculation of the requirement current?

Best regards,

Seongdae.

Seongdae,

We don't have a way to estimate this today for the F28388D device. In addition, use cases are too varied to capture a current that would accurately predict the current consumption for every user. Nevertheless, the Power Consumption Summary section in the datasheet is an attempt at trying to capture this. However as you can see in the test case description, it's very generic. You can use the "System Current Consumption" table along with "Typical Current Consumption per Disabled Peripheral" to get a little closer to your use case.

As i said in the previous reply, whatever the current consumption is, you need to add guard band to it. It's a safer approach to design for the worst case. Let us know if it's not clear.

Hi Frank

Thank you for your kind reply.

I understand your comments mentioned in the your reply.

However, it is not easy for me to grasp current consumption using the table on the datasheet you mentioned because my experience is insufficient.

I don’t request you that you do calculate the correct current value for my application.

But, in the case I use fully TMS320F28388D and its functions while maintaining the hardware configurations mentioned in the previous inquiry, I would like to ask you again what the empirical value of your TI technical staff is about the TMS320F28388D's current consumption.

That is;

What are the current consumption values of 3.3V and 1.2V considered by Jason in several configurations recommended by Jason for my application?

And are the values considered by Jason sufficient as the TMS320F28388D’s consumption currents for the TMS320F28388D’s H/W and S/W configuration mentioned in the previous inquiry?

Best regards

Seongdae.

Seongdae,

I understand. You can somewhat approximate your use case by using the 475mA current as a baseline and subtracting the currents of the peripherals you aren't using from it utilizing "Table 5-2 Typical Current Reduction per Disabled Peripheral". Most of the current draw just comes from enabling the clocks to the module.

As mentioned in the description for the System Current Consumption table, all peripherals have clocks enabled.

As an example, if you aren't using all 4 ADCs, your projected current would be 475mA - (4 x 2.6mA) = 464mA.

Let us know if it's not clear.

Hi Frank

Thank you for your reply.

If not use all the peripheral listed in the Table 5-2, the total reducible Idd current is 138.5mA as bellow.

Is my calculation right?

If not use all the peripheral in the Table5-2, by the your method mentioned last your reply, this case’s current is 336.5mA(= 475 – 138.5).

But, in the real case, general user uses one or greater among all the peripheral in the Table5-2.

Then the current in their case would be more than 336.5mA. This is not seems to match the Idd TYP value(288mA) on the TMS320F28388D’s datasheet.

Is there any other factors besides Table5-2 when reviewing the Idd reduction current?

If those exist, what are those and how do I calculate the Idd reduction current by using those?

Best regards

Seongdae.

Seongdae,

The approach you have is correct however some of the module instances you have listed is wrong. For instance, there are only 2 SDFM module clocks not 8. Please double check the actual module clock instances using CPUSYSREGS.PCLKCRx registers in the TRM.

Since the reduction currents are typical values, please subtract from the typical 288mA instead of the max 475mA I mentioned in the previous reply. Keep in mind the test condition for typical values is 30C and nominal voltages. Also as i mentioned in the previous reply, most of the current draw comes from turning on the clocks to the modules. Depending on what you are using the module for, you would see more current.

Hi Frank

Is it wrong that the baseline of subtraction is 475mA you mentioned in the previous reply?

In this your reply you are telling me that TMS320F28388D’s Idd current is 288mA when I use all the peripheral in the Table5-2 under the condition of 30℃ and nominal voltages. Is that right?

Is possible the case where the current consumption of TMS320F28388D is from 288mA to 475mA even though all those peripheral devices are used under this condition?

If such cases are possible, would you please tell me those cases?

Best regards

Seongdae.

Seongdae,

475mA is the max number and it's driven predominately by temperature. 288mA is the typical number. The numbers in the current reduction table are typical numbers so you will have to subtract typical from typical.

Yes, 288mA is the typical current you should see if you are using all the peripherals listed in Table 5-2 under nominal conditions. However as i mentioned before, the 288mA number is derived from a use-case that could be vastly different from yours.

Yes, it is very possible for your nominal current to be different from 288mA. There is device-to-device variation in leakage current and more importantly, your use-case could be very different from the use-case that was used to derive the currents in Table 5-1.

Let us know if it's still not clear.

Hi Frank

Thank you for your reply.

1. According to the your previous reply and the Figure5-1, 5-3 of datasheet, is it correct to understand that the baseline of subtraction is approximately 283mA under the following conditions of use?

   -. VDD: 1.2V

   -. SYSCLK: 190Mhz

   -. CMCLK: 125Mhz

   -. Full use of the peripherals in the Table5-2

   -. Operating ambient temperature: 90℃

    

2. According to the your previous reply and the Figure5-1, 5-3 of datasheet, is it correct to understand that the baseline of subtraction is approximately 305mA under the following conditions of use?

   -. VDD: 1.2V

   -. SYSCLK: 200Mhz

   -. CMCLK: 125Mhz

   -. Full use of the peripherals in the Table5-2

   -. Operating ambient temperature: 125℃

    

3. In previous reply, you told me that 475mA is the max number and it's driven predominately by temperature.

   I think this temperature is the recommended operating ambient temperature. Is that right?

   If the above paragraph 2 is correct, what is the difference between 475mA and 305mA, approximately 170mA?

    

4. Dose GPIO pin use Idd current? Then how much Idd current is consumed per GPIO?

Best regards

Seongdae.