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Items relevant to "Replacement Module For The SL486 & MV601":
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Replacement module for
the SL486 & MV601
remote control receiver ICs
This simple module is a replacement for the
Plessey SL486 & MV601 infrared preamplifier
& receiver ICs. It’s based on a new IR receiver
subsystem plus a specially programmed Z86
microcontroller.
By RICK WALTERS
Over the years, SILICON CHIP has
described a number of projects that
included infrared remote control. Several of these were based on the Plessey
SL486 & MV601 infrared preamplifier
and receiver ICs but unfortunately
these devices are no longer available.
There are three projects involved, as
follows:
(1). Infrared Remote Control For
Model Railroads, April-May 1992;
(2). Remote Volume Control For Hifi
Systems, May-June 1993; and
(3). Stereo Preamplifier With IR Remote Control, Sept-Nov 1993.
For a while, it looked as though
these circuits would all become obsolete, or that readers would not be able
to get replacements if either of the two
Plessey devices failed. Fortunately, a
new infrared (IR) receiver subsystem
recently became available and so
we’ve been able to come up with a
module that’s a complete replacement
for the two Plessey devices.
Of course, the module is not a dropin replacement since two separate
ICs were originally used. Instead, the
board has to be mounted separately
and flying leads used to make the
connec
tions after the two Plessey
devices have been removed. This is
quite straightforward, since the outputs from the module are labelled
exactly the same as for the original
MV601 device.
Before we take a closer look at the
new circuit, let’s briefly recap on the
roles of the original devices.
The SL486 was basically an infrared preamplifier IC that processed
IR signals picked up by an external
photodiode. It included a differential
input to reduce noise pick-up, several
amplifier stages and an AGC circuit.
Its output was then fed to the MV601
“remote control receiver” IC.
Fig.1: the circuit is
based on a Z1954
(or equivalent) IR
receiver subsystem
(IC1) and a Z86E08
microcontroller (IC2).
IC1 takes the place
of the original SL486
preamplifier IC and its
external photodiode,
while IC2 does the job
of the MV601.
April 1996 53
PARTS LIST
1 PC board, code 09103961, 50
x 50mm
1 Z1954 (DSE) or PIC12043
(Oatley Electronics) – (IC1)
1 Z86E08 programmed microcontroller (available from
Silicon Chip) – (IC2)
1 18-pin IC socket (optional)
1 4MHz crystal (X1)
1 5mm LED (LED1)
Fig.2: install the parts on the PC board
as shown here. Leave the two links
(shown dotted) out if you intend using
the device in SILICON CHIP projects.
Fig.3: this is the full-size etching
pattern for the PC board. Check your
board carefully for any defects before
installing the parts.
Capacitors
1 47µF 16VW electrolytic
1 0.1µF MKT polyester
1 680pF ceramic
2 22pF NPO ceramic
Resistors (0.25W, 1%)
4 100kΩ
1 47Ω
1 470Ω
This larger-than-life-size view shows the completed PC board. Make sure that
the microcontroller carries an RXD label.
The MV601 decoded the signal from
the SL486 and provided five BCD
outputs (labelled A-E). These could
be either momentary or latched, depending on whether pin 5 was high or
low. In addition, the MV601 provided
a “data ready” output at pin 10. This
output was normally high but would
go low whenever a valid code was
present on the A-E outputs. Finally,
pins 3 & 4 were the “rate” inputs and
these were connected to match the
transmitter rate connections.
IR receiver subsystem
The new IR receiver subsystem
carries the type designation Z1954
and is available from Dick Smith
Electronics. An equivalent device,
designated PIC12043, is also available
from Oatley Electronics. We’ve tested
both devices in this circuit and found
that they offer similar performance. In
each case, the device looks a bit like
a small 3-terminal regulator but has a
plastic bubble on the front which is the
lens for the IR receiver diode.
The Z1954 is actually a lot simpler
to use than the SL486 it replaces, as it
needs no external components around
it. As well as the IR receiver diode,
the TO-220 style package contains an
amplifier, a limiter, a bandpass filter
and a demodulator. Its on-axis reception distance is quoted as eight metres
but this will obviously depend on the
light output from the source.
Circuit details
Fig.1 shows the circuit of the replacement module. IC1 is the Z1954
IR receiver subsystem. Its output
appears at pin 1 and is fed to pin 9 of
IC2, the Z86 IC. Note that the output
of IC1 is actually inverted, compared
to the transmitted signal, but this is
compensated for in IC2.
RESISTOR COLOUR CODES
❏
No.
❏ 4
❏ 1
❏ 1
54 Silicon Chip
Value
100kΩ
470Ω
47Ω
4-Band Code (1%)
brown black yellow brown
yellow violet brown brown
yellow violet black brown
5-Band Code (1%)
brown black black orange brown
yellow violet black black brown
yellow violet black gold brown
The Z86E08 microcontroller used for IC2 is the same
type of device used in the recent Railpower Mk.2 project
(Sep-Oct 1995 & Jan 1996).
This time, however, it has been programmed to emulate
the MV601 codes. The processor needs a crystal, a couple
of capacitors and four resistors to do the emulation. An
acknowledge LED has also been included to indicate the
reception of a valid code.
When power is first applied to the microprocessor, it
checks the A & B rate inputs and, depending on the linking,
sets the internal timer to the correct frequency. It then waits
until two pulses with a 6T period between them appear at
pin 9 (P32) of IC2. This is the synchronising pulse time.
Once a sync pulse has been recognised, the next five
bits of data are decoded as zeros or ones and stored. This
data string will be repeated a number of times before the
transmitter button is released.
The next string is also decoded and compared with the
first one. If they are identical, the data is made available at
P20-P24 and the DATA READY line is pulled low, thereby
illuminating LED1.
Finally, linking options have been provided to latch the
output data (output 5 low) and Tristate the outputs (output
9 high). These functions were provided to allow complete
compatibility with the MV601. Note: Tristate outputs were
not used in the SILICON CHIP designs.
Construction
A small PC board coded 09103961 (50 x 50mm) has
been designed to hold all the parts. Fig.2 shows the wiring details. As shown on this diagram, some of the pads
have numbers next to them. These numbers refer to the
equivalent pin on the MV601.
The two optional links are shown dotted – leave them
off the board if you intend using the module in the
aforementioned SILICON CHIP projects. This will ensure
momentary operation of the A-E outputs (ie, the decoded
outputs will only go high while the transmitter button
is being pressed).
Alternatively, install the link at output 5 if you want
latched outputs and the link at 9 for Tristate outputs.
The remaining parts can be installed on the board in
any order although its best to leave the microcontroller
(IC2) until last. A socket can be used for this IC or you can
solder it directly to the PC board. Both the acknowledge
LED (LED1) and the IR receiver subsystem (IC1) can be
connected to the PC board via flying leads if that makes
for more convenient mounting arrangements.
Testing
Being such a simple board, it should work first go without any problems. The only way to confirm its operation is
to illuminate it with one of our previous remote controls
which uses an MV500 remote control IC and a 500kHz
resonator. The acknowledge LED should light whenever
a valid code is received. If it doesn’t, make sure that the
A and B rate programming in the transmitter and receiver
are the same.
If you do have a problem, look for dry solder joints and
for solder bridges between the IC pins.
Footnote: the programmed Z86E08 microprocessor
(RXD) is available from Silicon Chip Publications for $18
SC
(incl. p&p).
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April 1996 55
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