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NKM2401 데이터시트 PDF




Milford에서 제조한 전자 부품 NKM2401은 전자 산업 및 응용 분야에서
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부품번호 NKM2401 기능
기능 Radio Data Encoder/Decoder IC
제조업체 Milford
로고 Milford 로고


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NKM2401 데이터시트, 핀배열, 회로
Data Sheet and Application Notes NKM2401 Code/decoder chip
Part number 1-982
Description
The NKM2401 Radio Data Encoder/Decoder IC enables serial data to be easily transported over low
power radio links and therefore allows users to quickly and easily add short range “wireless” capabilities
to their systems. It is designed for use with licence exempt transmitter and receiver modules operating
in the VHF and UHF bands and provides the buffering, packetisation, encoding, error checking and ‘bit
bashing’ required for transmitters and the reverse processes for receivers.
It can be interfaced to any PC or microprocessor serial port to provide simplex (one way) transfer of
data with built in error checking ensuring data integrity. It is ideally suited for use with the Parallax
BASIC Stampor other similar devices.
Features
Applications
Simple to use
Transparent operation
Single chip solution
Data acquisition
Alarm systems
Hand held terminals
Typical Application
Serial Data In
TxD
Busy*
TxEn
RxD
Serial Data Out
Data Ready*
Send Data*
User
Application
NKM2401
RF Transmitter
RF Receiver
* Optional handshake lines
NKM2401
User
Application
Introduction
Radio links comprising pre built and tested transmitter and receiver modules are now readily available
from a number of suppliers. These are easily connected to standard encoders and decoders allowing
simple On/Off remote control systems to be assembled.
However, sending data over these radio links is difficult as they are generally AC coupled, bandwidth
limited (100Hz to 5KHz typical) and may be subject to noise and interference. The receiver may
produce digital ‘white noise’ on its data output in the absence of any signal and in addition requires some
time to extract the data from the received audio signal. The format of the data must also be given
consideration as asymmetric data such as Serial ASCII (RS232) which is non DC balanced will cause the
‘data slicer’ in the receiver to give poor performance leading to errors after consecutive sequences of
ones or zeros. There may also be considerable pulse width distortion and ‘jitter’ produced by the link.
These radio links cannot therefore, usually be successfully connected directly to a UART, as such
devices will not tolerate these errors and almost certainly will produce erroneous data which may be
worse than useless !
NKM2401 Issue 1.1 Nov-98
© Milford Instruments/nikam electronics www.milinst.demon.co.uk
Page 1 of 15




NKM2401 pdf, 반도체, 판매, 대치품
Data Sheet and Application Notes NKM2401 Code/decoder chip
Part number 1-982
Technical Specifications
Ambient Temperature 20° C
Supply Voltage
+5.0 V
Parameter
Min
Typical
Max
Units Notes
Supply Voltage
Supply Current
4.75
1.8
5.0
5.25
Volts
2.4 mA
Serial In/Out Baud rate
Character time
RF transmit bit time
RF transmit time
Receive & decode time
Handshake delay
Serial data output time
Tx Enable source current
2400
4.16
200
35
36
1
50
8.0
bps 1
mS 2
uS 3
mS
mS
mS
mS 4
20 mA
Operating temperature
Storage Temperature
0 20 +40 deg. C
-40 +85 deg. C
Notes
1) Data is always ‘true’ i.e. same polarity as RS232 +/-12V levels but at 0v to +5V (Vcc) logic levels.
(Start bit is logic high, stop bit is logic low.)
2) 1 start, 8 data, 1 stop = 10 bits @ 416uS/bit = 4.16mS
3) Manchester encoded.
4) Eight bytes with handshake delay.
NKM2401 Issue 1.1 Nov-98
© Milford Instruments/nikam electronics www.milinst.demon.co.uk
Page 4 of 15

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NKM2401 전자부품, 판매, 대치품
Data Sheet and Application Notes NKM2401 Code/decoder chip
Part number 1-982
Receive Mode Interface
+5V
LED (Option)
Vcc
Rx Data Input
No Connect
Mode
Low
NKM2401
470R
Data Ready
Serial Data
Send Data +5V
Host
Ground (0V)
One Wire Interface (No Handshake)
+5V
Vcc
Rx Data Input
No Connect
Mode
Low
Ground (0V)
NKM2401
470R
Data Ready
Serial Data
Send Data
LED (Option)
Host
Three Wire Interface
+5V
Vcc
Rx Data Input
No Connect
Mode
Low
Ground (0V)
NKM2401
470R
Data Ready
Serial Data
Send Data
10k
Two Wire Interface
LED (Option)
Host
NKM2401 Issue 1.1 Nov-98
© Milford Instruments/nikam electronics www.milinst.demon.co.uk
Page 7 of 15

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관련 데이터시트

부품번호상세설명 및 기능제조사
NKM2401

Radio Data Encoder/Decoder IC

Milford
Milford

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