RS08 New project and question

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RS08 New project and question

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SecondTechCo
Contributor IV

Would you start a new project today with a MC9RS08K if you needed a product that was good for 5 years ?

Also in the specifications for the MC9RS08K it lists an unusual statement.   This is it :

 

ADC — 12-channel, 10-bit resolution;

2.5 μs conversion time; automatic compare

function; operation in stop; fully functional

from 2.7 V to 5.5 V (8-

 

 

We want a product that runs down to 1.8 Volts which is the VDD specification on this micro.  What happens to the A/D measurment and comparision at source voltages between 2.7 volts and 1.8 volts.

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john_suchyta
NXP Employee
NXP Employee

Hi William,

the RS08KA8 datasheet statement in the features section appears to have been left over from the datasheet it was copied from. The ADC operates down to 1.8V – it is the same 10-bit ADC used on our similar low-voltage QG MCU. The KA8 device is a good seller, so it is unlikely that it will be gone in the next 5 years.

One caution on the KA8 – the low voltage detect level for rising VDD is about 2.0V, meaning that the initial power ramp has to go above 2.0V to get out of reset. After that, the LVD can be shut off to prevent triggering below 2V. The part is only tested down to 1.8V so be sure that your lowest supply voltage does not go below that.

Regards,

John

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john_suchyta
NXP Employee
NXP Employee

Hi William,

the RS08KA8 datasheet statement in the features section appears to have been left over from the datasheet it was copied from. The ADC operates down to 1.8V – it is the same 10-bit ADC used on our similar low-voltage QG MCU. The KA8 device is a good seller, so it is unlikely that it will be gone in the next 5 years.

One caution on the KA8 – the low voltage detect level for rising VDD is about 2.0V, meaning that the initial power ramp has to go above 2.0V to get out of reset. After that, the LVD can be shut off to prevent triggering below 2V. The part is only tested down to 1.8V so be sure that your lowest supply voltage does not go below that.

Regards,

John

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