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参数资料
| 型号： | M3004LD |
| 厂商： | 意法半导体 |
| 英文描述： | REMOTE CONTROL TRANSMITTER |
| 中文描述： | 遥控器 |
| 文件页数： | 3/10页 |
| 文件大小： | 105K |
| 代理商： | M3004LD |
REMOTE CONTROL SIGNAL OUTPUT
(REMO)
The REMO signaloutput stageis a push-pulltype.
In the HIGH state, a bipolar emitter-followerallows
a highoutput current. The timing of thedataoutput
formatis listed in tables1 and2. The information is
defined by the distance t
b
between the leading
edgesof the flashedpulsesor the first edge of the
modulatedpulses(seeFigure3). Theformatof the
output data is given in Figures 2 and 3. The data
wordstarts withtwotogglebitsT1 andT0,followed
by three bits for defining the sub-system address
S2,S1andS0,andsixbitsF,E, D,C,BandAwhich
are defined by the selected key.
In themodulatedtransmissionmodethefirsttoggle
bit is replaced by a constant reference time bit
(REF). Thiscanbe usedasareferencetimefor the
decodingsequence.The togglebits function is an
indication for the decoder that the nextinstruction
has to be considered as a new command. The
codesforthesub-systemaddressandtheselected
key are given in tables3 and 4.
The REMO output is protectedagainst ”Lock-up”,
i.e.thelengthof anoutputpulseislimitedto <1ms,
even if the oscillatorstops during an outputpulse.
This avoids the rapid discharge of the battery that
would otherwise be caused by the continuousac-
tivation of the LED.
OSCILLATOR INPUT / OUTPUT
(OSCIand OSCO)
The external components must be connected to
these pinswhen usingan oscillator with a ceramic
resonator. The oscillator frequency may vary be-
tween350kHzand600kHz asdefined bythe reso-
nator.
FUNCTIONAL DESCRIPTION
Keyboardoperation
In the stand-by mode all drivers (DRV0N to
DRV6N)areon (low impedancetoV
SS
). Whenever
a key is pressed, one or more of the senseinputs
(SENnN) are tied to ground. This will start the
power-upsequence.Firstthe oscillator isactivated
and after the debouncetime t
DB
(see Figure 4) the
output drivers (DRV0N to DRV6N) become active
successively.
Within the first scan cycle the transmissionmode,
the applied sub-system address and the selected
command code are sensed and loaded into an
internal data latch.
In contrast to the commandcode, the sub-system
is sensed only within the first scan cycle. If the
applied sub-system address is changed while the
commandkey is pressed,the transmitted sub-sys-
tem addressis not altered.
In a multiple key stroke sequence (see Figure 5)
the commandcodeisalways alteredinaccordance
with the sensedkey.
MULTIPLE KEY-STROKE PROTECTION
The keyboard is protected against multiple key-
strokes. If more than one key is pressed at the
sametime,thecircuitwill notgenerateanewoutput
at REMO (see Figure 5). In case of a multiple
key-stroke, the scan repetitionrate is increasedto
detect the release of a keyas soon as possible.
There are two restrictions caused by the special
structure of the keyboard matrix :
- The keys switching to ground (code numbers 7,
15, 23, 31, 39, 47, 55 and 63) and the keys
connectedto SEN5NandSEN6Narenotcovered
completely by the multiple key protection. If one
sense inputisswitchedto ground,furtherkeyson
the same sense line are ignored, i.e. the com-
mand code corresponding to ”key to ground” is
transmitted.
- SEN5N and SEN6N are not protected against
multiple keystroke on the same driver line, be-
cause this condition has been used for the defi-
nition ofadditionalcodes(codenumber56to 63).
OUTPUT SEQUENCE
(data format)
The output operation will start when the selected
code is found. A burst of pulses, including the
latchedaddressandcommandcodes,is generated
at the output REMO as long as a key is pressed.
The format of the output pulse train is given in
Figures 2 and 3. The operation is terminated by
releasingthekeyorifmorethanonekeyispressed
at the same time. Once a sequenceis started, the
transmitted data words will always be completed
after the key is released.
The toggle bits T0 and T1 are incremented if the
key is released for a minimum time t
REL
(see Fig-
ure 4). The toggle bits remain unchanged within a
multiplekey-stroke sequence.
M3004LAB1 - M3004LD
3/10
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