>
>> Prefer if the MPU is 8051 but it doesn't matter. Must be low power with
>> suspend currents under 30uA. I have seen the Cypress units and they are
>> almost perfect but the wake-up time is ~5ms. My current design is up and
>> running in around 120us after wake up. It is a data logger so it wakes up
>> as fast as every 10ms and spends around 50us collecting data,
>>
>> Currently I provide the NAND flash translation layer in the firmware on
>> the device. I am pursuing this solution so that I may have the USB mass
>> storage capability making data upload easier.
>>
>> Elan.
>>
>>
"Donald" <Donald@dontdoithere.com> wrote in message
news:JZOdnRwMoecdcuXYnZ2dnUVZ_vudnZ2d@comcast.com...
> Elan Magavi wrote:
>
>> I have been trying to find a device with a MPU core and a USB 2.0
>> interface.
>
> If you mean a USB 2.0 High Speed in a MPU, I have yet to see one.
>
> For that matter, I have not seen a High Speed stand alone chip either.
>
> Good Luck
>
> donald
>
> I have been trying to find a device with a MPU core and a USB 2.0 interface.
If you mean a USB 2.0 High Speed in a MPU, I have yet to see one.
For that matter, I have not seen a High Speed stand alone chip either.
Good Luck
donald
> Prefer if the MPU is 8051 but it doesn't matter. Must be low power with
> suspend currents under 30uA. I have seen the Cypress units and they are
> almost perfect but the wake-up time is ~5ms. My current design is up and
> running in around 120us after wake up. It is a data logger so it wakes up as
> fast as every 10ms and spends around 50us collecting data,
>
> Currently I provide the NAND flash translation layer in the firmware on the
> device. I am pursuing this solution so that I may have the USB mass storage
> capability making data upload easier.
>
> Elan.
>
>
>
Reply by Elan Magavi●December 7, 20062006-12-07
"Jim Granville" <no.spam@designtools.maps.co.nz> wrote in message
news:45786660$1@clear.net.nz...
> Elan Magavi wrote:
>
>> I have been trying to find a device with a MPU core and a USB 2.0
>> interface. Prefer if the MPU is 8051 but it doesn't matter. Must be low
>> power with suspend currents under 30uA. I have seen the Cypress units and
>> they are almost perfect but the wake-up time is ~5ms. My current design
>> is up and running in around 120us after wake up. It is a data logger so
>> it wakes up as fast as every 10ms and spends around 50us collecting data,
>>
>> Currently I provide the NAND flash translation layer in the firmware on
>> the device. I am pursuing this solution so that I may have the USB mass
>> storage capability making data upload easier.
>
> I guess USB devices simply don't target fast wakeup, so you may need two
> cores in this, for the lowest power. 10ms/50us sounds like a RTC firing an
> on 0nChip Osc into action (C8051F410, MSP430 etc), and then the USB is the
> users access side, not used during data store ?
>
> -jg
>
You may be right. This was the conclusion I was coming to! The cores would
share the FLASH and the nonUSB core would have to step through the FAT to
store.. Sure hate to do that 'cause I have a size limitation.
Reply by Jim Granville●December 7, 20062006-12-07
Elan Magavi wrote:
> I have been trying to find a device with a MPU core and a USB 2.0 interface.
> Prefer if the MPU is 8051 but it doesn't matter. Must be low power with
> suspend currents under 30uA. I have seen the Cypress units and they are
> almost perfect but the wake-up time is ~5ms. My current design is up and
> running in around 120us after wake up. It is a data logger so it wakes up as
> fast as every 10ms and spends around 50us collecting data,
>
> Currently I provide the NAND flash translation layer in the firmware on the
> device. I am pursuing this solution so that I may have the USB mass storage
> capability making data upload easier.
I guess USB devices simply don't target fast wakeup, so you may need two
cores in this, for the lowest power. 10ms/50us sounds like a RTC firing
an on 0nChip Osc into action (C8051F410, MSP430 etc), and then the USB
is the users access side, not used during data store ?
-jg
Reply by Elan Magavi●December 7, 20062006-12-07
I have been trying to find a device with a MPU core and a USB 2.0 interface.
Prefer if the MPU is 8051 but it doesn't matter. Must be low power with
suspend currents under 30uA. I have seen the Cypress units and they are
almost perfect but the wake-up time is ~5ms. My current design is up and
running in around 120us after wake up. It is a data logger so it wakes up as
fast as every 10ms and spends around 50us collecting data,
Currently I provide the NAND flash translation layer in the firmware on the
device. I am pursuing this solution so that I may have the USB mass storage
capability making data upload easier.
Elan.