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PICList Thread
'SPI DTMF transceiver'
1999\11\12@155747 by Dan Tye

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face
Thanks, James and Peter for your suggestion on using the max3100, it looks
like it will do just fine.  I now need to find a couple of other SPI
devices... First, does anyone know of a DTMF encoder/decoder that works with
SPI?  I can find a lot of DTMF encoder only devices, but I've had no joy on
a combined encoder/decoder.  Second, I'm also looking for an SPI 256k x 8
EEPROM, uchip's largest SPI EEPROM is just 64k, but they do have a 256k i2c
EEPROM; does anyone know where I can find a 256k SPI EEPROM?

+++++++++++++++++++++++++++++++++++++++
++      Dan Tye
++      Chief Engineer
++      Tel-Tron Technologies Corporation
++      220 Fentress Boulevard
++      Daytona Beach, FL 32114
++      Phone: 904-255-1921    Fax: 904-258-3782
+++++++++++++++++++++++++++++++++++++++

1999\11\12@160204 by Jose Souto

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www.nexflash.com

Dan Tye wrote:
>
> Thanks, James and Peter for your suggestion on using the max3100, it looks
> like it will do just fine.  I now need to find a couple of other SPI
> devices... First, does anyone know of a DTMF encoder/decoder that works with
> SPI?  I can find a lot of DTMF encoder only devices, but I've had no joy on
> a combined encoder/decoder.  Second, I'm also looking for an SPI 256k x 8
> EEPROM, uchip's largest SPI EEPROM is just 64k, but they do have a 256k i2c
> EEPROM; does anyone know where I can find a 256k SPI EEPROM?
>
> +++++++++++++++++++++++++++++++++++++++
> ++      Dan Tye
> ++      Chief Engineer
> ++      Tel-Tron Technologies Corporation
> ++      220 Fentress Boulevard
> ++      Daytona Beach, FL 32114
> ++      Phone: 904-255-1921    Fax: 904-258-3782
> +++++++++++++++++++++++++++++++++++++++

1999\11\13@105216 by Nick Taylor

picon face
Atmel AT25256

Dan Tye wrote:
>
> Thanks, James and Peter for your suggestion on using the max3100, it looks
> like it will do just fine.  I now need to find a couple of other SPI
> devices... First, does anyone know of a DTMF encoder/decoder that works with
> SPI?  I can find a lot of DTMF encoder only devices, but I've had no joy on
> a combined encoder/decoder.  Second, I'm also looking for an SPI 256k x 8
> EEPROM, uchip's largest SPI EEPROM is just 64k, but they do have a 256k i2c
> EEPROM; does anyone know where I can find a 256k SPI EEPROM?
>
> +++++++++++++++++++++++++++++++++++++++
> ++      Dan Tye
> ++      Chief Engineer
> ++      Tel-Tron Technologies Corporation
> ++      220 Fentress Boulevard
> ++      Daytona Beach, FL 32114
> ++      Phone: 904-255-1921    Fax: 904-258-3782
> +++++++++++++++++++++++++++++++++++++++

1999\11\15@094551 by netquake

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Hi!
I don't know exactly what you're looking for but check:
TDK Semiconductor's 75T2089/2090/2091 are
complete Dual-Tone Multifrequency (DTMF)
Transceivers that can both generate and detect all
16 DTMF tone-pairs. These ICs integrate the
performance-proven 75T202 DTMF receiver with a
DTMF generator circuit.
The DTMF receiver electrical characteristics are
identical to the standard 75T202 device
characteristics. The DTMF generator provides
performance similar to the Mostek MK5380, but with
an improved (tighter) output amplitude range
specification and with the addition of independent
latch and reset controls.
An additional feature of the 75T2090/2091 is
"imprecise" call progress detector. The detector
detects the presence of signals in the 305-640 Hz
band.
(continued)
á DTMF Generator and Receiver on one-chip
á Call progress detection (2090/2091 only)
á Early detect output (2091 only)
á DTMF Receiver exhibits excellent speech
immunity
á Analog input range from -32 to -2 dBm
(ref 600W)
á Three-state outputs (4-bit hexadecimal) from
DTMF Receiver
á AC coupled, internally biased analog input
á Latched DTMF Generator inputs
á DTMF output typ. -8 dBm (Low Band) and
-5.5 dBm (High Band)
á Easy interface for microprocessor dialing
á Uses inexpensive 3.579545 MHz crystal for
reference
á Low-power 5 volt CMOS

{Quote hidden}

------------------------------------
netQ <spam_OUTnetquakeTakeThisOuTspaminnocent.com>
http://virtuaweb.com/picprog
"Home of amateur PIC programmers..."

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1999\11\15@121450 by Dave VanHorn
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> Hi!
> I don't know exactly what you're looking for but check:
> TDK Semiconductor's 75T2089/2090/2091 are

Beware. These are 4 bit bus devides, not SPI, and they are somewhat hard to
get ahold of.
I just designed them out of a product.

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