Lpc2000

I am looking at a new design for a very low power logger. I like the LPC 
2106 very much  - but its not quite right, so I was going to use a PIC 
(nasty after the luxury of a decent processor).

I need:

       Sub 50 microamps normal operation (idle or power down)
       Ability to wake every second based on the RTC
       Abilty to wake (on external interrupt and read the current value 
in the RTC counter

I read the data sheet but no info on power consumption. Any one with any 
experience or ideas - in normal, power down and idle modes?

Any idea where I can get a user manual?

Owen Mooney

Dear Owen

An Atmel AVR is the right choice for your application... dependent of how
much flash and sram you need have a look at the 

ATmega128 its faster than any PIC and uses very low current....

The newer ATmega44,88,162 etc... use below 50uA in shutdown and this is for
real...

Regards
lasse

-----Original Message-----
From: Owen Mooney [mailto:ojm@...] 
Sent: 23. december 2004 01:54
To: lpc2000@yahoogroups.com
Subject: [lpc2000] Any experience of the LPC2130 under very low power?


I am looking at a new design for a very low power logger. I like the LPC 
2106 very much  - but its not quite right, so I was going to use a PIC 
(nasty after the luxury of a decent processor).

I need:

       Sub 50 microamps normal operation (idle or power down)
       Ability to wake every second based on the RTC
       Abilty to wake (on external interrupt and read the current value 
in the RTC counter

I read the data sheet but no info on power consumption. Any one with any 
experience or ideas - in normal, power down and idle modes?

Any idea where I can get a user manual?

Owen Mooney



 
Yahoo! Groups Links

Have a look at the Texas MSP430

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Web:   www.homanndesigns.com
email: homann@...
Phone: +61 421 601 665
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Lasse Madsen wrote:

> Dear Owen
> 
> An Atmel AVR is the right choice for your application... dependent of how
> much flash and sram you need have a look at the 
> 
> ATmega128 its faster than any PIC and uses very low current....
> 
> The newer ATmega44,88,162 etc... use below 50uA in shutdown and this is for
> real...
> 
> Regards
> lasse
> 
> -----Original Message-----
> From: Owen Mooney [mailto:ojm@...] 
> Sent: 23. december 2004 01:54
> To: lpc2000@yahoogroups.com
> Subject: [lpc2000] Any experience of the LPC2130 under very low power?
> 
> 
> I am looking at a new design for a very low power logger. I like the LPC 
> 2106 very much  - but its not quite right, so I was going to use a PIC 
> (nasty after the luxury of a decent processor).
> 
> I need:
> 
>        Sub 50 microamps normal operation (idle or power down)
>        Ability to wake every second based on the RTC
>        Abilty to wake (on external interrupt and read the current value 
> in the RTC counter
> 
> I read the data sheet but no info on power consumption. Any one with any 
> experience or ideas - in normal, power down and idle modes?
> 
> Any idea where I can get a user manual?
> 
> Owen Mooney
> 
> 
> 
>  
> Yahoo! Groups Links
> 
> 
> 
>  
> 
> 
> 
> 
> 
> 
> 
>  
> Yahoo! Groups Links
> 
> 
> 
>  
> 
> 
> 
> 
> 
>

--- In lpc2000@yahoogroups.com, Owen Mooney <ojm@s...> wrote:

I think you need MSP430 from TI. 

> I am looking at a new design for a very low power logger. I like the 
LPC 
> 2106 very much  - but its not quite right, so I was going to use a 
PIC 
> (nasty after the luxury of a decent processor).
> 
> I need:
> 
>        Sub 50 microamps normal operation (idle or power down)
>        Ability to wake every second based on the RTC
>        Abilty to wake (on external interrupt and read the current 
value 
> in the RTC counter
> 
> I read the data sheet but no info on power consumption. Any one with 
any 

> experience or ideas - in normal, power down and idle modes?
> 
> Any idea where I can get a user manual?
> 
> Owen Mooney

Hello Owen,

we did some bench measurements, these will probably show up as typical
values in the data sheet for a later version:

If the device is in power down mode (the RAM content is kept and power
is supplied to Vdd), we measured approx. 150 uAs. The value is related
to the one voltage source 3.3V instead of having to provide 1.8V as
well. We have to generate the 1.8V internally, even during power down
because the RAM and the RTC run from 1.8V

The RTC itself can be buffered through a vbat pin. It uses approx.
15-20 uAs.  It is important to know that current from vbat is also
drawn during normal operation.

So, can't provide you with the 50 uAs requested but the value is MUCH
lower than the lpc2106 and you can log so much more data into the
flash than with an AVR Mega or a MSP430 but at the cost of a larger
battery.

Hope this helps, Robert

--- In lpc2000@yahoogroups.com, Owen Mooney <ojm@s...> wrote:
> I am looking at a new design for a very low power logger. I like the
LPC 
> 2106 very much  - but its not quite right, so I was going to use a PIC 
> (nasty after the luxury of a decent processor).
> 
> I need:
> 
>        Sub 50 microamps normal operation (idle or power down)
>        Ability to wake every second based on the RTC
>        Abilty to wake (on external interrupt and read the current value 
> in the RTC counter
> 
> I read the data sheet but no info on power consumption. Any one with
any 

> experience or ideas - in normal, power down and idle modes?
> 
> Any idea where I can get a user manual?
> 
> Owen Mooney

Use an MSP430F series. sub 1uA in sleep mode, wakes up in <1usec. 8MHz 
is around 3mA. The core of the LPC2000 alone draws around 30mA as far as 
I can see. I haven't seen data on peripherals etc.

It is easy to get MSP430 systems that have mean fuel consumptions of < 
1mA. Take a look in the MSP430 group under a htread call throughput (or 
was it here??? bugger this short term memory loss!

Al

Owen Mooney wrote:

> I am looking at a new design for a very low power logger. I like the LPC
> 2106 very much  - but its not quite right, so I was going to use a PIC
> (nasty after the luxury of a decent processor).
> 
> I need:
> 
>        Sub 50 microamps normal operation (idle or power down)
>        Ability to wake every second based on the RTC
>        Abilty to wake (on external interrupt and read the current value
> in the RTC counter
> 
> I read the data sheet but no info on power consumption. Any one with any
> experience or ideas - in normal, power down and idle modes?
> 
> Any idea where I can get a user manual?
> 
> Owen Mooney
> 
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I'll second the MSP430 suggestion.  It takes VERY LOW idle power,
has JTAG debug capabilities in even the lowest cost part, and had
a clean 16-bit instruction set.

Regards
-Bill Knight
R O SoftWare

On Thu, 23 Dec 2004 13:05:08 +1100, Peter Homann wrote:

Have a look at the Texas MSP430

------------------------------------------------------------------
Web:   www.homanndesigns.com
email: homann@...
Phone: +61 421 601 665
www.homanndesigns.com/DigiSpeedDeal.html - DC Spindle control
www.homanndesigns.com/TurboTaig.html     - Taig Mill Upgrade board

Lasse Madsen wrote:
> Dear Owen
> 
> An Atmel AVR is the right choice for your application... dependent of how
> much flash and sram you need have a look at the 
> 
> ATmega128 its faster than any PIC and uses very low current....
> 
> The newer ATmega44,88,162 etc... use below 50uA in shutdown and this is for
> real...
> 
> Regards
> lasse
> 
> -----Original Message-----
> From: Owen Mooney [mailto:ojm@...] 
> Sent: 23. december 2004 01:54
> To: lpc2000@yahoogroups.com
> Subject: [lpc2000] Any experience of the LPC2130 under very low power?
> 
> 
> I am looking at a new design for a very low power logger. I like the LPC 
> 2106 very much  - but its not quite right, so I was going to use a PIC 
> (nasty after the luxury of a decent processor).
> 
> I need:
> 
>        Sub 50 microamps normal operation (idle or power down)
>        Ability to wake every second based on the RTC
>        Abilty to wake (on external interrupt and read the current value 
> in the RTC counter
> 
> I read the data sheet but no info on power consumption. Any one with any 
> experience or ideas - in normal, power down and idle modes?
> 
> Any idea where I can get a user manual?
> 
> Owen Mooney
> 
> 
> 
>  
> Yahoo! Groups Links
> 
> 
> 
>  
> 
> 
> 
> 
> 
> 
> 
>  
> Yahoo! Groups Links
> 
> 
> 
>  
> 
> 
> 
> 
> 
> 




Yahoo! Groups Links

Thanks for the responses.

That's a disapointment. According to the datasheet the LPC2106 uses about
10 uA on the 1.8V in power down - and a Max1616 regulator for 1.8 V will use about 8 uA 
so obviously the on chip 1.8V regulator has not been a good idea as far as power
is concerned. I think I expressed a concern about this concept earlier.

I'll probably stick with the PIC as I have all the development tools.

Owen


 Date: Thu, 23 Dec 2004 05:14:04 -0000

   From: "philips_apps" <philips_apps@...>
Subject: 
Re: Any experience of the LPC2130 under very low power?

Hello Owen,

we did some bench measurements, these will probably show up as typical
values in the data sheet for a later version:

If the device is in power down mode (the RAM content is kept and power
is supplied to Vdd), we measured approx. 150 uAs. The value is related
to the one voltage source 3.3V instead of having to provide 1.8V as
well. We have to generate the 1.8V internally, even during power down
because the RAM and the RTC run from 1.8V

The RTC itself can be buffered through a vbat pin. It uses approx.
15-20 uAs.  It is important to know that current from vbat is also
drawn during normal operation.

So, can't provide you with the 50 uAs requested but the value is MUCH
lower than the lpc2106 and you can log so much more data into the
flash than with an AVR Mega or a MSP430 but at the cost of a larger
battery.

Hope this helps, Robert

How about current usage in active mode (core and peripherals)?


--- In lpc2000@yahoogroups.com, "philips_apps" <philips_apps@y...> 
wrote:
> 
> Hello Owen,
> 
> we did some bench measurements, these will probably show up as 
typical
> values in the data sheet for a later version:
> 
> If the device is in power down mode (the RAM content is kept and 
power
> is supplied to Vdd), we measured approx. 150 uAs. The value is 
related
> to the one voltage source 3.3V instead of having to provide 1.8V as
> well. We have to generate the 1.8V internally, even during power 
down
> because the RAM and the RTC run from 1.8V
> 
> The RTC itself can be buffered through a vbat pin. It uses approx.
> 15-20 uAs.  It is important to know that current from vbat is also
> drawn during normal operation.
> 
> So, can't provide you with the 50 uAs requested but the value is 
MUCH

> lower than the lpc2106 and you can log so much more data into the
> flash than with an AVR Mega or a MSP430 but at the cost of a larger
> battery.
> 
> Hope this helps, Robert

I don't have an issue with the current drawn from Vdd in power down, I
can always cut the Vdd at the regulator.  But the Ibat is a lot higher
than a typical RTC chip at <1uA.  I don't know why it is >15uA and
they should have included the diodes to allow it to be powered from
Vdd when available.  I guess this RTC is better than none.  But it
won't fit my needs. 


--- In lpc2000@yahoogroups.com, Owen Mooney <ojm@s...> wrote:
> Thanks for the responses.
> 
> That's a disapointment. According to the datasheet the LPC2106 uses
about
> 10 uA on the 1.8V in power down - and a Max1616 regulator for 1.8 V
will use about 8 uA 
> so obviously the on chip 1.8V regulator has not been a good idea as
far as power

> is concerned. I think I expressed a concern about this concept earlier.
> 
> I'll probably stick with the PIC as I have all the development tools.
> 
> Owen
> 
> 
>  Date: Thu, 23 Dec 2004 05:14:04 -0000
>    From: "philips_apps" <philips_apps@y...>
> Subject: 
> Re: Any experience of the LPC2130 under very low power?
> 
> Hello Owen,
> 
> we did some bench measurements, these will probably show up as typical
> values in the data sheet for a later version:
> 
> If the device is in power down mode (the RAM content is kept and power
> is supplied to Vdd), we measured approx. 150 uAs. The value is related
> to the one voltage source 3.3V instead of having to provide 1.8V as
> well. We have to generate the 1.8V internally, even during power down
> because the RAM and the RTC run from 1.8V
> 
> The RTC itself can be buffered through a vbat pin. It uses approx.
> 15-20 uAs.  It is important to know that current from vbat is also
> drawn during normal operation.
> 
> So, can't provide you with the 50 uAs requested but the value is MUCH
> lower than the lpc2106 and you can log so much more data into the
> flash than with an AVR Mega or a MSP430 but at the cost of a larger
> battery.
> 
> Hope this helps, Robert