TRC1300, TRC1315
MARCSTAR
I E/D
REMOTE CONTROL ENCODER/DECODERS
SLWS011D – AUGUST 1996 – REVISED JANUARY 1997
24
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
16-channel, infrared or RF connection
Figure 11 shows an example of MARCSTAR I E/D devices in a 16-channel infrared or RF connection, typically
used in consumer electronics (TV, VCR, etc.) or remote-control toy applications. U1 is a TRC1300 configured
as an encoder by not connecting the CONF terminal (which is internally pulled up, so no connection is required).
U2, a TRC1315, is configured as a decoder by tying CONF low (CONF must be low before VCC is applied).
PROG is held low by an internal pulldown to disable the program mode. Closing the Learn switch places U2
in the program mode so that the security code from an encoder can be learned. Both the encoder and decoder
are set to a 2-kHz data clock (DCLK) frequency (20 kHz sample clock, SCLK) using an external RC at OSCC
and OSCR. An LED is connected to the LED terminal of the encoder and indicates transmission of code. The
outputs of a 4-bit binary encoder are connected to inputs VRC/TX1 – VRC/TX4 of the MARCSTAR I E/D encoder.
When one of the 16 momentary switches (S1 – S16) is pressed, the binary equivalent is encoded by U3 and
applied to the MARCSTAR I E/D encoder (U1) inputs. The binary equivalent is transmitted to the MARCSTAR
I E/D decoder (U2) where the corresponding outputs go low. The inputs of a 4-bit binary decoder are connected
to the VRC/TX1 – VRC/TX4 outputs of the MARCSTAR I E/D decoder. When these terminals output the received
binary function data, they are then decoded by U4, and the appropriate U4 output is activated. The outputs can
be used to control one of 15 devices at a time, or for a 15 position semiproportional control.
3 V
0.001
F
33 k
VRC/TX1
VRC/TX2
VRC/TX3
VRC/TX4
OSCR
OSCC
DIN/DOUT
CONF
PROG
LED
GND
14
5
6
11
10
9
8
1
2
3412
13
7
VRC/TX1
VRC/TX2
VRC/TX3
VRC/TX4
OSCR
OSCC
DIN/DOUT
CONF
PROG
LED
GND
14
5
6
1
2
3412
13
7
TX
RX
33 k
R1– R4
22 k
TX
RX
QD
QC
QB
QA
U3
S1
One Switch at
a Time May Be
Pressed
U4 4-Bit Binary Decoder
4-Bit
Binary
Encoder
/CAP
CC
V
TEST
CC
V
CC
V
TEST
/CAP
CC
V
QD
QC
QB
QA
Output 1
Output 16
S16
Learn
1 k
1 k
U1 TRC1300 (encoder)
U2 TRC1315 (decoder)
0.001
F
0.1
F1 F
0.1
F
12 V
0.1
F
11
10
9
8
NOTE A: Terminal numbers are for the D package.
Figure 11. A 16-Channel, RF or Infrared Connection