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PJRC Teensy 4.0 announced, small 600 mhz Cortex M7 board

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  PJRC Teensy 4.0 announced, small 600 mhz Cortex M7 board Paul Rubin <no.email@nospam.invalid> - 2019-08-07 16:58 -0700
    Re: PJRC Teensy 4.0 announced, small 600 mhz Cortex M7 board Cecil - k5nwa <cbayona@cbayona.com> - 2019-08-07 23:16 -0500

#28740 — PJRC Teensy 4.0 announced, small 600 mhz Cortex M7 board

In case anyone cares about this sort of thing.  I find it cool.

Teensy 4.0 is announced:

  - NXP iMXRT1062 Cortex M7 MCU, 1024k ram (512k tightly coupled,
    i.e. on a special fast internal bus that allows 2 accesses in the
    same cycle), 2048k flash, RNG, RTC, crypto acceleration, ports and
    timers galore.  Includes many analog in and PWM out (no true analog
    out), CAN, USB host, SDIO, etc.  SPDIF audio in and out.  FPU
    supports single and double precision and has transcendentals.

  - Same form factor as Teensy 3.2 (0.7*1.4 inch), mostly compatible
    pinout, similar price ($20).

  - Uses 100 mA current (3.3v) at 600 mhz.  Supposedly fastest
    microcontroller available today, whatever that means.  I calculate
    166 μA/MHz which is decent, probably beating most Cortex M4's in
    compute efficiency because of the M7's superscalar capability.  But
    the Ambiq M4's at 6(!) μA/MHz are in a different class of low power
    if you don't mind 48 mhz speed.

  - more details and benchmarks: https://www.pjrc.com/store/teensy40.html
    Also available from Adafruit which is where I first saw the
    announcement.

In raw speed and capacity this is slower and more limited than a $5
Raspberry Pi Zero, but it's smaller, lower powered, uses MCU-style
programming rather than Linux, has lots of analog I/O (Raspberry has
none), etc.  So it's better suited than the Raspberry for realtime and
mixed signal applications.

The Pocket Beagle is bigger, more power hungry, and costs a bit more
($25?), but has comparable I/O and a pair of on-chip realtime
coprocessors, so it may also be of interest.

Overall I don't have an immediate use for one of these, but I
appreciated seeing the announcement and think it's nice to know about.
It will be great for MicroPython and maybe overkill for Forth.

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#28741

On 8/7/2019 6:58 PM, Paul Rubin wrote:
> In case anyone cares about this sort of thing.  I find it cool.
> 
> Teensy 4.0 is announced:
> 
>    - NXP iMXRT1062 Cortex M7 MCU, 1024k ram (512k tightly coupled,
>      i.e. on a special fast internal bus that allows 2 accesses in the
>      same cycle), 2048k flash, RNG, RTC, crypto acceleration, ports and
>      timers galore.  Includes many analog in and PWM out (no true analog
>      out), CAN, USB host, SDIO, etc.  SPDIF audio in and out.  FPU
>      supports single and double precision and has transcendentals.
> 
>    - Same form factor as Teensy 3.2 (0.7*1.4 inch), mostly compatible
>      pinout, similar price ($20).
> 
>    - Uses 100 mA current (3.3v) at 600 mhz.  Supposedly fastest
>      microcontroller available today, whatever that means.  I calculate
>      166 μA/MHz which is decent, probably beating most Cortex M4's in
>      compute efficiency because of the M7's superscalar capability.  But
>      the Ambiq M4's at 6(!) μA/MHz are in a different class of low power
>      if you don't mind 48 mhz speed.
> 
>    - more details and benchmarks: https://www.pjrc.com/store/teensy40.html
>      Also available from Adafruit which is where I first saw the
>      announcement.
> 
> In raw speed and capacity this is slower and more limited than a $5
> Raspberry Pi Zero, but it's smaller, lower powered, uses MCU-style
> programming rather than Linux, has lots of analog I/O (Raspberry has
> none), etc.  So it's better suited than the Raspberry for realtime and
> mixed signal applications.
> 
> The Pocket Beagle is bigger, more power hungry, and costs a bit more
> ($25?), but has comparable I/O and a pair of on-chip realtime
> coprocessors, so it may also be of interest.
> 
> Overall I don't have an immediate use for one of these, but I
> appreciated seeing the announcement and think it's nice to know about.
> It will be great for MicroPython and maybe overkill for Forth.
> 

Pretty nice for not much money, useful when you want bare metal and 
having to deal with the Linux overhead. I2S would be handy for 
implementing a SDR radio.


-- 

Cecil - k5nwa

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