Radiometrix
Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England
Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233
Issue: 1, 20 December 2007
CTA88
8 b it A d d r e s s - 8 b it D a t a e n c o d e r /d e c o d e r
CTA88 is an 8 bit address, 8 bit data encoder
and decoder combined in a single IC. This
device is intended to be used with ISM band
telemetry modules and can be operated in
either Encode or Decode mode.
CTA88 uses 1kbps differential Manchester bit
balancing with preamble and checksum. It
permits a simple, one way link to be
Figure 1: CTA88 in 28 pin DIL package
established, for simple remote control
applications, with a minimum of effort and
no customer software input.
CTA88 is
available in 28pin SO and DIL packages.
Features
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Operating voltage (temperature):
4.0V-5.5V for standard version (-40°C to +125°C)
2.0V-5.5V for low voltage version (-40°C to +85°C)
Draws <2mA without external load
8 bit address and 8 bit data
256 different remotes with 8 controls each
Single packetised transmission for fast activation
Maximum usage of the range capability of an RF module
Adequate preamble to settle data slicer in the receiver.
Extra wake up preamble to allow for transmitter power up time requirements
Differential Manchester encoding of address, data and checksum
Synchronisation codes and checksum to reduce false triggering on noise
Suitable to be used with Narrow Band FM radio modules
Ceramic resonator or crystal oscillator up to 20MHz
Data rate up to 5.6kbps
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Minimum external component requirement
Serial operation allow a PC to send or receive CTA88 command bursts
Decoder timeout
Up to 8 encoder/decoder modes including push button, delayed and continuous TX modes.
Applications
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Security and Alarm systems
Emergency assistance call system
Status reporting and monitoring systems
RF Remote control systems
Industrial controls
HVAC controls
Simple On/Off switching
Long range telecontrol with Narrow Band FM radios
Radiometrix Ltd
CTA88
page 1
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