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Discussion Groups

Discussion Groups | 68HC12 | Supervisory device

Join our technical discussions about Freescale Microcontrollers: M68HC12. (Freescale Semiconductor is a Subsidiary of Motorola).

Supervisory device - kp_venu - Sep 3 23:03:00 2002

Hi All,
Has anyone used DS1811 or DS1233 with D60A controller?
Presently I'm using MC34164 but I want to add a power-on delay in
RESET line.
Any help?
Best Regards,
Venu




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RE: Supervisory device - Killingsworth, Steve - Sep 4 8:06:00 2002

We use the ADM809LART from Analog Devices on a DG128A MCU. It monitors Vcc
and provides power up reset delay. It has performed well.

-----Original Message-----
From: kp_venu [mailto:]
Sent: Wednesday, September 04, 2002 12:04 AM
To:
Subject: [68HC12] Supervisory device Hi All,
Has anyone used DS1811 or DS1233 with D60A controller?
Presently I'm using MC34164 but I want to add a power-on delay in
RESET line.
Any help?
Best Regards,
Venu
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RE: Supervisory device - Kelley, Dale - Sep 4 10:12:00 2002

watch out if you are using the COP timer, it takes very little delay (5us) to render it useless
Dale Kelley

-----Original Message-----
From: kp_venu [mailto:]
Sent: Wednesday, September 04, 2002 12:04 AM
To:
Subject: [68HC12] Supervisory device Hi All,
Has anyone used DS1811 or DS1233 with D60A controller?
Presently I'm using MC34164 but I want to add a power-on delay in
RESET line.
Any help?
Best Regards,
Venu
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http://www.motorola.com/mcu




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Re: Supervisory device - Carl Ungvarsky - Sep 4 10:27:00 2002

I have been using the MAX706CSA for several years with the 68HC812A4 and the
68HC912B32 with good results. It has power down reset, reset switch input,
and watchdog. As I recall one of the inputs allows RC to provide a small
power on delay. >Hi All,
>Has anyone used DS1811 or DS1233 with D60A controller?
>Presently I'm using MC34164 but I want to add a power-on delay in
>RESET line.
>Any help?
>Best Regards,
>Venu _________________________________________________________________
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Re: Supervisory device - Kerry Berland - Sep 4 12:23:00 2002

We have used the L4949 voltage regulator, made by
ON (formerly a Motorola part) and by ST. It provides
+5V regulated, very low drop-out, very low quiescent
current. Provides delayed reset. Also has an additional
uncommitted comparator that we used with an external
resistive divider network to sense loss of VBATT,
causing an interrupt to the MCU, telling it that
it's time to save current status into EEPROM.
With sufficient hold-up capacitors, the MCU had time
to save data. We used this chip to power the MCU,
and an additional regulator chip-- with enable-- to
power peripheral I/O. That other chip would be shut down
in sleep mode. Believe that the L4949 was designed
especially for automotive. This design went into
volume production and worked out well.

Hope this is helpful.

Best regards,

Kerry Berland

Silicon Engines
2101 Oxford Road
Des Plaines, IL 60018 USA
847-803-6860
Fax 847-803-6870

----- Original Message -----
From: kp_venu
To:
Sent: Tuesday, September 03, 2002 11:03 PM
Subject: [68HC12] Supervisory device Hi All,
Has anyone used DS1811 or DS1233 with D60A controller?
Presently I'm using MC34164 but I want to add a power-on delay in
RESET line.
Any help?
Best Regards,
Venu Yahoo! Groups Sponsor
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Re: Supervisory device - kp_venu - Sep 4 22:48:00 2002

Thanks to All,
I think ADM809LART is a right device.(Low cost compare to DS1811)
Thanks and Regards,
Venu

--- In 68HC12@y..., "Kelley, Dale" <Dale.Kelley@a...> wrote:
> watch out if you are using the COP timer, it takes very little
delay (5us) to render it useless
> Dale Kelley




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