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KRX416 数据表(PDF) 3 Page - Radiometrix Ltd

部件名 KRX416
功能描述  Code-hopping decoder with 4 outputs
Download  5 Pages
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制造商  RADIOMETRIX [Radiometrix Ltd]
网页  http://www.radiometrix.com
标志 RADIOMETRIX - Radiometrix Ltd

KRX416 数据表(HTML) 3 Page - Radiometrix Ltd

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Radiometrix Ltd
KRX416
page 3
Function S0 =1
Message repeated....
150ms: end of message
240ms: function activated
Start of new message
S0 Output
RXD
Notes:
1.
Absolute maximum source/sink current from each S0-S3, LED-L, LED-V pins is 25mA.
2.
Output pulse length is between 10 and 12ms
3.
Can be held high or low. When high, the outputs S0-S3 will be active only for a brief period
(see note 2), even if the same message continues to be received over and over again – this is
intended as a control pulse for interfacing to additional logic or a microcontroller and is the
most basic and secure way to use the decoder.
When low, the outputs will be active for 350-500ms (approx.) and this long period allows
“refreshing” by repeat messages from the same transmitter. In this way, repeated
transmissions with the same code (e.g. a user holding down a function-code button at the
transmitter) will cause the respective decoder output also to stay active, until the message
ceases to be received within the 350-500ms window. The function-code may change (i.e. be
added to) but the outputs will not be cleared until reception of the message has ended.
Data from a code-hopped message
Transmission format is 1250bps (nominal rate) Manchester encoding. Although the function-code is
only 4 bits, total message length is 67 bits. This includes a 28-bit serial number and a 32-bit encrypted
hop-code. Note that the serial number and function code data is not encrypted. The correct status of
the transmission is used to validate the data. This is achieved through use of the ever changing hop-
code (changes for every new message) and by synchronising the KRX416 IC to the transmitter(s) in use.
Put another way: the KRX416 “Learns” individual unique transmitters, as required by the user.
The hop-code is encrypted using the serial number of the transmitter plus the manufacturer code (64-
bit), which is kept secret and is not transmitted. The function-code (S0-S3) appears twice in the
message and forms a part of the hop-code encryption process.
If the KRX416 loses synchronisation with the transmitter (e.g. repeated transmitter activation whilst
out of range of the receiver) then the transmitter must be activated twice with valid and sequential hop-
codes before KRX416 will allow the control to be processed. The hop-code is only valid if it is within a
forward window of +32768 activations. This mechanism prevents “code-grabbers” from breaking the
security of the system by recording and re-broadcasting old codes. Additionally, in the KRX416 a
window exists allowing up to 14 transmissions to occur whilst the transmitter is out of range before two
valid sequential transmissions are required to use the system. In practice a user may not notice the
latter, since human reaction to the unsuccessful attempt is simply to “press the button again”.
The level of redundancy and encryption in a message mean that, in simple terms, the KRX416 will only
output a function-code that has been received from a properly recognised and synchronised transmitter.
Figure 3: Timing diagram – showing action upon receiving a message with S0 = 1
In a typical set-up, the time delay between “button-press” at the transmitter and function activation by
the KRX416 IC at the receiver is approx. ¼s.


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