MCF8316A: Mass production programming tool

Hi Conor,

Conor said:

We have confirmed that there are plans to release a jig like a Gang programmer for mass production programming in Q2 2022. Any updates on this? We are looking for a mass production programming tool for the MCF8316A.

We currently plan to have the product (MCx Gang Programmer) released early Q4. 

Conor said:

When using the built-in BuckRegulator, if it is not used externally and is only used to supply to the internal DVDD and AVDD, how much current capacity should we estimate?

The internal buck regulators current capacity will depend on the inductor/resistor used. The max current capacity when using buck regulator is provided in Table 7-1 of the datasheet. 

Conor said:

When using the built-in BuckRegulator, is it correct to understand that the output to AVDD is 20mA MAX external plus the internal DVDD consumption current = 170mA Ext/Load output?

If the buck regulator is using a 47 uH inductor, then the max current output is 170mA minus current drawn from AVDD. The listed outputs of the internal buck take the draw of DVDD into account already.

Conor said:

if used under the conditions surrounded by the red frame in the table below, the external L is 600mA (MAX?), so would it be okay to use something rated at about 1A? Are there any recommended coil conditions?

Using a 1 A max rated inductor would be good. If you would like a recommendation for a 47 uH inductor, we used the part number 78438335470 in our EVMs.

Conor said:

In the case of the circuit below, the internal DVDD is supplied from the Buck Regulator, but how much current does the DVDD consume (Typ, MAX)?

I will need some time to look into this. I will aim to get back with you by 7/25.

Regards,

Joshua

Hi Joshua,

Q2. Your answer mentions the maximum current capacity when supplying to the internal DVDD/AVDD. What about the maximum current capacity when supplying only to the internal DVDD?

Q5. We look forward to your update.

Thanks,

Conor

Hi Conor,

We are curious why the customer ins interested in understanding the current requirement of the DVDD LDO. Could the customer provide us with a comment on why they are interested in this? 

Conor said:

Q2
When using the built-in BuckRegulator, if it is not used externally and is only used to supply to the internal DVDD, how much current capacity should we estimate?

DVDD will typically only pull ~1 mA. Typically what we recommend if the internal buck regulator is not required for supplying external circuitry or AVDD is stated in the following images:

Example schematic:

Conor said:

Q4.
In the case of the circuit below, the internal DVDD is supplied from the Buck Regulator, but how much current does the DVDD consume (Typ, MAX)?

DVDD will draw roughly ~1mA. Could the customer let us know why they would like to know the Typ and max current consumption of DVDD?

Regards,

Joshua

Hi Joshua,

Joshua Horlander Cruz said:

The internal buck regulators current capacity will depend on the inductor/resistor used. The max current capacity when using buck regulator is provided in Table 7-1 of the datasheet. 

What is the minimum output of the built-in Buck Regulator - in other words, what is the total current used by the internal DVDD (approximately 1 mA) and the internal AVDD?

The datasheet describes IAVDD as an "External analog regulator load," so I assume it is the current when it is used externally and not internally.

I would like to know the total current of DVDD and AVDD consumed inside the IC, not the maximum value.

Thanks,

Conor

Hi Conor,

We would like to know why the customer is interested in knowing about the current consumed by AVDD and DVDD within the IC? We typically do not provide this specification to customers.

Regards,

Joshua

Hi Joshua,

The reason I want to know the current consumption of the internal AVDD and DVDD is because I want to make the size of the inductor as small as possible.

When I observed the actual current consumption of the internal regulator, it was less than 1mA. I would like to confirm whether this actual value is reasonable.

The internal AVDD and DVDD are only used to supply power to the internal logic circuit, so I don't think a large current will flow, but I would like to know the maximum current consumption of the internal AVDD and DVDD as I want to use them as reference values ​​when designing.

Thanks,

Conor