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Discussion Groups | MSP430 | Can I supply a device with output
The purpose of this group is to foster exchange of information on the Texas Instruments MSP430 family of microcontrollers and related tools. Everyone welcome, all levels of familiarity/expertise.
Can I supply a device with output - rene - Oct 22 10:07:22 2009
hello,
CPU=3D msp430F149
I want make power_on and power_off for a little chip with the outputs port =
of CPU
My device is a CMOS EEprom type 24LC512 with I2C protocole
My cpu is supplied by an lithium-ion cell and I must avoid consommation.
If I put in // 4 or 5 outputs of a port, can I use it for VCC of my eeprom =
?
=20
ICC Read is 450=B5A and ICC Write is 5mA.
thank ( sorry for my poor english )
Bonjour,
je veux alimenter une eeprom Cmos avec 4 ou 5 sorties d'un port mises en pa=
rallele .
cette eeprom consomme 5 mA en =E9criture et 450=B5A en mode lecture.=20
Est-ce une id=E9e qui se tient ou un d=E9lire technique ??
Cela me permettra d'arreter compl=E9tement cette eeprom en mode repos, car =
chaque =B5A est important
Le montage doit tourner 7 ans avec une pile lithium, le tout =E9tant moul=
=E9 dans de la r=E9sine. Donc pile us=E9e =3D=3D module bon pour la benne!
Merci
------------------------------------
______________________________
controlSUITE™ software. Comprehensive. Intuitive. Optimized.
Real-world software for real-time control. Details Here!
(You need to be a member of msp430 -- send a blank email to msp430-subscribe@yahoogroups.com )
CPU=3D msp430F149
I want make power_on and power_off for a little chip with the outputs port =
of CPU
My device is a CMOS EEprom type 24LC512 with I2C protocole
My cpu is supplied by an lithium-ion cell and I must avoid consommation.
If I put in // 4 or 5 outputs of a port, can I use it for VCC of my eeprom =
?
=20
ICC Read is 450=B5A and ICC Write is 5mA.
thank ( sorry for my poor english )
Bonjour,
je veux alimenter une eeprom Cmos avec 4 ou 5 sorties d'un port mises en pa=
rallele .
cette eeprom consomme 5 mA en =E9criture et 450=B5A en mode lecture.=20
Est-ce une id=E9e qui se tient ou un d=E9lire technique ??
Cela me permettra d'arreter compl=E9tement cette eeprom en mode repos, car =
chaque =B5A est important
Le montage doit tourner 7 ans avec une pile lithium, le tout =E9tant moul=
=E9 dans de la r=E9sine. Donc pile us=E9e =3D=3D module bon pour la benne!
Merci
------------------------------------
______________________________
controlSUITE™ software. Comprehensive. Intuitive. Optimized.
Real-world software for real-time control. Details Here!
(You need to be a member of msp430 -- send a blank email to msp430-subscribe@yahoogroups.com )
Re: Can I supply a device with output - OneStone - Oct 22 11:36:07 2009
You can put the EE$PROM into a very low power standby mode at 1uA by
instruction on the I2C port. This is possibly easier than supplying from
a pin.
Al
rene wrote:
> hello,
> CPU= msp430F149
> I want make power_on and power_off for a little chip with the outputs port of CPU
>
> My device is a CMOS EEprom type 24LC512 with I2C protocole
>
> My cpu is supplied by an lithium-ion cell and I must avoid consommation.
> If I put in // 4 or 5 outputs of a port, can I use it for VCC of my eeprom ?
>
> ICC Read is 450µA and ICC Write is 5mA.
> thank ( sorry for my poor english )
> Bonjour,
> je veux alimenter une eeprom Cmos avec 4 ou 5 sorties d'un port mises en parallele .
> cette eeprom consomme 5 mA en écriture et 450µA en mode lecture.
>
> Est-ce une idée qui se tient ou un délire technique ??
> Cela me permettra d'arreter complétement cette eeprom en mode repos, car chaque µA est important
> Le montage doit tourner 7 ans avec une pile lithium, le tout étant moulé dans de la résine. Donc pile usée == module bon pour la benne!
> Merci
>
> ------------------------------------
______________________________
controlSUITE™ software. Comprehensive. Intuitive. Optimized.
Real-world software for real-time control. Details Here!
(You need to be a member of msp430 -- send a blank email to msp430-subscribe@yahoogroups.com )
instruction on the I2C port. This is possibly easier than supplying from
a pin.
Al
rene wrote:
> hello,
> CPU= msp430F149
> I want make power_on and power_off for a little chip with the outputs port of CPU
>
> My device is a CMOS EEprom type 24LC512 with I2C protocole
>
> My cpu is supplied by an lithium-ion cell and I must avoid consommation.
> If I put in // 4 or 5 outputs of a port, can I use it for VCC of my eeprom ?
>
> ICC Read is 450µA and ICC Write is 5mA.
> thank ( sorry for my poor english )
> Bonjour,
> je veux alimenter une eeprom Cmos avec 4 ou 5 sorties d'un port mises en parallele .
> cette eeprom consomme 5 mA en écriture et 450µA en mode lecture.
>
> Est-ce une idée qui se tient ou un délire technique ??
> Cela me permettra d'arreter complétement cette eeprom en mode repos, car chaque µA est important
> Le montage doit tourner 7 ans avec une pile lithium, le tout étant moulé dans de la résine. Donc pile usée == module bon pour la benne!
> Merci
>
> ------------------------------------
______________________________
controlSUITE™ software. Comprehensive. Intuitive. Optimized.
Real-world software for real-time control. Details Here!
(You need to be a member of msp430 -- send a blank email to msp430-subscribe@yahoogroups.com )
Re: Can I supply a device with output - Joerg - Oct 22 16:21:18 2009
rene wrote:
> hello,
> CPU= msp430F149
> I want make power_on and power_off for a little chip with the outputs port of CPU
>
> My device is a CMOS EEprom type 24LC512 with I2C protocole
>
> My cpu is supplied by an lithium-ion cell and I must avoid consommation.
> If I put in // 4 or 5 outputs of a port, can I use it for VCC of my eeprom ?
>
> ICC Read is 450µA and ICC Write is 5mA.
> thank ( sorry for my poor english )
>
That's ok. My French would be unintelligible :-)
Paralleling port pins is iffy, can increase EMI. If you have to, then at
least don't go across ports but make sure all 4 or 5 are on the same
port. If you use only one port pin: Per datasheet they say a port drops
max 600mV at 6mA, so roughly 500mV at 5mA. Meaning your EEPROM would see
VCC minus 500mV during write. Ecriture sounds so much nicer ...
In reality most MSP430 are in the 30ohm range for Rdson for the ports so
realistically you'd lose less than 200mV. But that is a typical value
and technically you must go by what the datasheet guarantees.
If you can use the shut-down command like Al suggested that would be
much more elegant and would save you a port pin.
--
Cordialement, Joerg
http://www.analogconsultants.com/
------------------------------------
(You need to be a member of msp430 -- send a blank email to msp430-subscribe@yahoogroups.com )
> hello,
> CPU= msp430F149
> I want make power_on and power_off for a little chip with the outputs port of CPU
>
> My device is a CMOS EEprom type 24LC512 with I2C protocole
>
> My cpu is supplied by an lithium-ion cell and I must avoid consommation.
> If I put in // 4 or 5 outputs of a port, can I use it for VCC of my eeprom ?
>
> ICC Read is 450µA and ICC Write is 5mA.
> thank ( sorry for my poor english )
>
That's ok. My French would be unintelligible :-)
Paralleling port pins is iffy, can increase EMI. If you have to, then at
least don't go across ports but make sure all 4 or 5 are on the same
port. If you use only one port pin: Per datasheet they say a port drops
max 600mV at 6mA, so roughly 500mV at 5mA. Meaning your EEPROM would see
VCC minus 500mV during write. Ecriture sounds so much nicer ...
In reality most MSP430 are in the 30ohm range for Rdson for the ports so
realistically you'd lose less than 200mV. But that is a typical value
and technically you must go by what the datasheet guarantees.
If you can use the shut-down command like Al suggested that would be
much more elegant and would save you a port pin.
--
Cordialement, Joerg
http://www.analogconsultants.com/
------------------------------------
(You need to be a member of msp430 -- send a blank email to msp430-subscribe@yahoogroups.com )