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Discussion Groups
Discussion Groups | LPC2000 | P1.24 of LPC2214 doesn't work
Discussion group dedicated to the Philips LPC2000 family of ARM MCUs
Do you need a 16mbit async sram chip? - ghazanhaider - Oct 11 11:32:22 2006
I like the CY7C1061AV33-12ZC chip from cypress, 2MB of ram in one chip
at 3.3v and easy enough interface. At least one
The problem is digikey and mouser have nothing equivalent (the best
being 4mbit = 512kB) and anywhere else I check their minimum order is
$250 USD. Each of these chips are $40 roughly. Two or even one should
suffice for uclinux.
So I'm considering ordering $250's worth and putting up the rest in
single quantities on ebay. I only need two. Will you guys pay $50
including shipment for such a chip or will I be stuck with too much
memory?
Even better, is there anything equivalent for cheaper elsewhere?
(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )
P1.24 of LPC2214 doesn't work - Herbert Demmel - Oct 11 18:46:58 2006
Hi,
I'm trying to use P1.24 of a LPC2214 as an output but the port pins
constantly remains at about 2.3V.
I'm using
IO1DIR |= (1 << 25);
IO1CLR = (1 << 25);
to pull the pin low (PINSEL2 bit 3 has the correct state, P1.20 is not
pulled low at reset). If I try to do the same with e.g. P1.16, everything
works as expected.
Any idea?
Regards
Herbert
(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )
I'm trying to use P1.24 of a LPC2214 as an output but the port pins
constantly remains at about 2.3V.
I'm using
IO1DIR |= (1 << 25);
IO1CLR = (1 << 25);
to pull the pin low (PINSEL2 bit 3 has the correct state, P1.20 is not
pulled low at reset). If I try to do the same with e.g. P1.16, everything
works as expected.
Any idea?
Regards
Herbert
(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )
Re: Do you need a 16mbit async sram chip? - Herbert Demmel - Oct 11 18:47:59 2006
At 15:31 11.10.2006 +0000, you wrote:
>I like the CY7C1061AV33-12ZC chip from cypress, 2MB of ram in one chip
>at 3.3v and easy enough interface. At least one
>used it with lpc2200.
>
>The problem is digikey and mouser have nothing equivalent (the best
>being 4mbit = 512kB) and anywhere else I check their minimum order is
>$250 USD. Each of these chips are $40 roughly. Two or even one should
>suffice for uclinux.
>
>So I'm considering ordering $250's worth and putting up the rest in
>single quantities on ebay. I only need two. Will you guys pay $50
>including shipment for such a chip or will I be stuck with too much
>memory?
>
>Even better, is there anything equivalent for cheaper elsewhere?
You may use a PSRAM like the 2Mx16 (= 32 Mbit)
http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail?Ref=150446&Row=744047&Site=US,
it is much cheaper (it costs 4.80 US$ only), and it's as simple as SRAM to
connect. It has an access time of 70ns; the only disadvantage is, that it
is available in BGA packages with 0.75mm pitch only as it is destined to be
used in mobile handsets primarily. PSRAM is made by miscellanous producers,
simply have a look at Google for PSRAM.
BTW: The link to DigiKey points to a product which is not on stock :-(
Stocked PSRAMs from DigiKey are 1.7 ... 1.95V devices only.
Regards
Herbert
[Non-text portions of this message have been removed]
(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )
>I like the CY7C1061AV33-12ZC chip from cypress, 2MB of ram in one chip
>at 3.3v and easy enough interface. At least one
>used it with lpc2200.
>
>The problem is digikey and mouser have nothing equivalent (the best
>being 4mbit = 512kB) and anywhere else I check their minimum order is
>$250 USD. Each of these chips are $40 roughly. Two or even one should
>suffice for uclinux.
>
>So I'm considering ordering $250's worth and putting up the rest in
>single quantities on ebay. I only need two. Will you guys pay $50
>including shipment for such a chip or will I be stuck with too much
>memory?
>
>Even better, is there anything equivalent for cheaper elsewhere?
You may use a PSRAM like the 2Mx16 (= 32 Mbit)
http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail?Ref=150446&Row=744047&Site=US,
it is much cheaper (it costs 4.80 US$ only), and it's as simple as SRAM to
connect. It has an access time of 70ns; the only disadvantage is, that it
is available in BGA packages with 0.75mm pitch only as it is destined to be
used in mobile handsets primarily. PSRAM is made by miscellanous producers,
simply have a look at Google for PSRAM.
BTW: The link to DigiKey points to a product which is not on stock :-(
Stocked PSRAMs from DigiKey are 1.7 ... 1.95V devices only.
Regards
Herbert
[Non-text portions of this message have been removed]
(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )
Re: Do you need a 16mbit async sram chip? - ghazanhaider - Oct 12 9:59:13 2006
> You may use a PSRAM like the 2Mx16 (= 32 Mbit)
>
http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail?Ref=150446&Row=744047&Site=US,
> it is much cheaper (it costs 4.80 US$ only), and it's as simple as
SRAM to
> connect. It has an access time of 70ns; the only disadvantage is,
that it
> is available in BGA packages with 0.75mm pitch only as it is
destined to be
> used in mobile handsets primarily. PSRAM is made by miscellanous
producers,
> simply have a look at Google for PSRAM.
>
> BTW: The link to DigiKey points to a product which is not on stock :-(
> Stocked PSRAMs from DigiKey are 1.7 ... 1.95V devices only.
>
> Regards
> Herbert
>
> [Non-text portions of this message have been removed]
>
I've been following PSRAM chips as well, and BGA is just difficult for
me. Even if the pitch was 1mm. I'd like to get the uclinux system
running before getting into the lpc2888, 1.8V ram, bga psram and other
goodies. I'm also looking for 3.3V non-BGA PSRAM/utram if one exists
in stock anywhere.
(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )
Re: Do you need a 16mbit async sram chip? - Bill Knight - Oct 12 11:24:05 2006
ghazanhaider wrote:
> I like the CY7C1061AV33-12ZC chip from cypress, 2MB of ram in one chip
> at 3.3v and easy enough interface. At least one
>
> The problem is digikey and mouser have nothing equivalent (the best
> being 4mbit = 512kB) and anywhere else I check their minimum order is
> $250 USD. Each of these chips are $40 roughly. Two or even one should
> suffice for uclinux.
>
> So I'm considering ordering $250's worth and putting up the rest in
> single quantities on ebay. I only need two. Will you guys pay $50
> including shipment for such a chip or will I be stuck with too much
> memory?
>
> Even better, is there anything equivalent for cheaper elsewhere?
Sorry if I jumped into this thread a bit late.
Future Electronics e-store indicates the
CY7C1061AV33-10ZXI might be available in single pieces. You might give
them a try.
Regards
-Bill Knight
R O SoftWare
(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )
> I like the CY7C1061AV33-12ZC chip from cypress, 2MB of ram in one chip
> at 3.3v and easy enough interface. At least one
>
> The problem is digikey and mouser have nothing equivalent (the best
> being 4mbit = 512kB) and anywhere else I check their minimum order is
> $250 USD. Each of these chips are $40 roughly. Two or even one should
> suffice for uclinux.
>
> So I'm considering ordering $250's worth and putting up the rest in
> single quantities on ebay. I only need two. Will you guys pay $50
> including shipment for such a chip or will I be stuck with too much
> memory?
>
> Even better, is there anything equivalent for cheaper elsewhere?
Sorry if I jumped into this thread a bit late.
Future Electronics e-store
CY7C1061AV33-10ZXI might be available in single pieces. You might give
them a try.
Regards
-Bill Knight
R O SoftWare
(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )
Re: Re: Do you need a 16mbit async sram chip? - Herbert Demmel - Oct 12 12:34:28 2006
At 13:56 12.10.2006 +0000, you wrote:
> > You may use a PSRAM like the 2Mx16 (= 32 Mbit)
> >
>http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail?Ref=150446&Row=744047&Site=US,
>
> > it is much cheaper (it costs 4.80 US$ only), and it's as simple as
>SRAM to
> > connect. It has an access time of 70ns; the only disadvantage is,
>that it
> > is available in BGA packages with 0.75mm pitch only as it is
>destined to be
> > used in mobile handsets primarily. PSRAM is made by miscellanous
>producers,
> > simply have a look at Google for PSRAM.
> >
> > BTW: The link to DigiKey points to a product which is not on stock :-(
> > Stocked PSRAMs from DigiKey are 1.7 ... 1.95V devices only.
> >
> > Regards
> > Herbert
> >
> > [Non-text portions of this message have been removed]
> >I've been following PSRAM chips as well, and BGA is just difficult for
>me. Even if the pitch was 1mm. I'd like to get the uclinux system
>running before getting into the lpc2888, 1.8V ram, bga psram and other
>goodies. I'm also looking for 3.3V non-BGA PSRAM/utram if one exists
>in stock anywhere.
As far as I know, there is no PSRAM in non-BGA. I've checked the net a lot
and could find anything. But using 0.75 mm pitch BGA is much more simple
than using the LPC2888, as 0.5mm pitch is a nightmare - you have to use 3
mil tracks which makes the PCB very expensive. 0.75 pitch can be done with
0.15 mm tracks and 0.3 mm vias when you place the vias into the pads. This
allows to use standard PCB technology (except of pluggin the via's holes).
Herbert
Regards
Herbert
[Non-text portions of this message have been removed]
(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )
> > You may use a PSRAM like the 2Mx16 (= 32 Mbit)
> >
>
>
> > it is much cheaper (it costs 4.80 US$ only), and it's as simple as
>SRAM to
> > connect. It has an access time of 70ns; the only disadvantage is,
>that it
> > is available in BGA packages with 0.75mm pitch only as it is
>destined to be
> > used in mobile handsets primarily. PSRAM is made by miscellanous
>producers,
> > simply have a look at Google for PSRAM.
> >
> > BTW: The link to DigiKey points to a product which is not on stock :-(
> > Stocked PSRAMs from DigiKey are 1.7 ... 1.95V devices only.
> >
> > Regards
> > Herbert
> >
> > [Non-text portions of this message have been removed]
> >I've been following PSRAM chips as well, and BGA is just difficult for
>me. Even if the pitch was 1mm. I'd like to get the uclinux system
>running before getting into the lpc2888, 1.8V ram, bga psram and other
>goodies. I'm also looking for 3.3V non-BGA PSRAM/utram if one exists
>in stock anywhere.
As far as I know, there is no PSRAM in non-BGA. I've checked the net a lot
and could find anything. But using 0.75 mm pitch BGA is much more simple
than using the LPC2888, as 0.5mm pitch is a nightmare - you have to use 3
mil tracks which makes the PCB very expensive. 0.75 pitch can be done with
0.15 mm tracks and 0.3 mm vias when you place the vias into the pads. This
allows to use standard PCB technology (except of pluggin the via's holes).
Herbert
Regards
Herbert
[Non-text portions of this message have been removed]
(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )
Re: Do you need a 16mbit async sram chip? - ghazanhaider - Oct 12 22:50:07 2006
I happen to build the PCBs at home using the laser printer technique,
and anything under 0.5mm TSOP or anything BGA becomes prohibitive,
unless I get the ICs as samples and spend a day or two practising.
TSOP is quite easy, and its in my best interest to keep the number of
vias extremely low. Even if I have to put a ribbon cable on one side
to the other. Thus the need to use fewer chips to boot uclinux. I'll
use board dev once I have finalized something. Its too early in my
career to use BGA.
That said, there's probably a market for PSRAM chips on dip or tsop or
soj breakout boards. Especially larger PSRAM chips 32mbit and higher.
>
> As far as I know, there is no PSRAM in non-BGA. I've checked the net
a lot
> and could find anything. But using 0.75 mm pitch BGA is much more
simple
> than using the LPC2888, as 0.5mm pitch is a nightmare - you have to
use 3
> mil tracks which makes the PCB very expensive. 0.75 pitch can be
done with
> 0.15 mm tracks and 0.3 mm vias when you place the vias into the
pads. This
> allows to use standard PCB technology (except of pluggin the via's
holes).
>
> Herbert
>
> Regards
> Herbert
>
> [Non-text portions of this message have been removed]
>
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