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PDF SC8521 Data sheet ( Hoja de datos )
| Número de pieza | SC8521 | |
| Descripción | INFRARED REMOTE CONTROL TRANSMITTER | |
| Fabricantes | Silan Microelectronics | |
| Logotipo |  |
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SC8521
INFRARED REMOTE CONTROL TRANSMITTER OF 8521 CODE FORMAT
DESCRIPTION
The SC8521 can be used in infrared remote control
transmitters. It generates output pulses, in accordance with the
RC5 protocol, when a key is pressed. The IC does not contain a
software programmable processor. However, it does contain a
ROM in which the codes that have to be transmitted are stored.
The oscillator frequency may be optionally chosen as 432KHz. For
432KHz additional external capacitors must be connected. When
a key in the key-matrix is pressed a driveline will be connected to
a sense line. This causes the oscillator to start and a
corresponding code will be generated conforming to the RC5
protocol.
Seven drive lines ( DR0 to DR6 ) and eight sense lines (SN0 to
SN7) may be connected via the key matrix to scan the keys.
When two or more keys are activated simultaneously no
transmission will take place.
FEATURES
SOP-20-300-1.27
SOP-20-375-1.27
* Power-down and key wake-up
* High output current ( 45mA)
* Oscillator frequency of 432KHz
* Multiple key protection
* Option of 25% or 33% duty factor
* RC5 protocol
* Maximum of 56 keys (20-pin version)
* Option of multi-system or single system transmitter
-- Multi-system: maximum 8 system, selection by key
-- Single system: maximum 8 different systems per IC,
selection by jumper wire or switch.
BLOCK DIAGRAM
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV: 1.3 2005.12.15
Page 1 of 14
1 page  
SC8521
3. Single system
SN0 should be connected to one of the drivelines or ground.
The bank that will be selected is equal to drive line number to which SN0 is connected. When connected to
ground the number will be 7. This achieved by loading the bank select flip-flops BS0 to BS2 with the contents of
C5 to C7 of the control timer when sense line SN0 is at logic 0. In this way it is possible to use two different
systems in one transmitter by using a side switch. With this option SN0 cannot be used to connect keys, so the
maximum number of keys will be lower (49 keys with 20-pin IC).
4. Multi system
The bank is selected by key for maximum 8 different systems (e.g. TV, VCR, CD, etc.), any key is flexible for
bank selection. When a user inserts a new battery, the default bank is always in bank 7. If only bank 7 is used,
then maximum number of key can be 56 keys for a 20-pin IC.
5. ROM
Logic 1
Logic 0
A schematic diagram of the ROM is illustrated. The ROM is divided into 8 banks of 2 × 64 bytes. Bank selection
is performed using flip-flops BS0 to BS2 that are the 3 highest bits of the address. With the ‘single system’these
bits are loaded from the 3 MSBs of the scan control when SN0 = 0. At power-on the bank select flip-flops will be
in an arbitrary state.
When a key was activated, the key number is stored in the 6-bit key register. This register forms the lower bits
of the ROM address. For each command the ROM will be accessed twice. This gives 16 bits in total (M0L to M7L
and M0H to M7H). The bits are described in Table 2.
Table2 ROM bit description
Bits
Function
M0L to M5L
Command bits 0 to 5
M6L
Field bit. This bit indicates whether command codes 0 to 63 are used (filed bit is at logic
1) or command codes 64 to 127 are used (filed bit is at logic 0).
M7L
Inhibit bit. When this bit is at logic 1 no transmission will take place. When this bit is at
logic 0 the appropriate code word will be transmitted.
M0H to M4H
System bits 0 to 4
M5H to M7H
Bank select. Will be stored in BS0 to BS2 when the ‘multi-system’option is selected.
With single system bits M5H to M7H are don’t care.
6. Pulse output
The bits of the remote control word, as indicated by the addressed ROM locations, are loaded into a shift
register every bit-time this register is shifted. The output is used to generate a logic1 in the biphase (Manchester)
coding, modulated with a frequency of 36 KHz. The duty factor of the modulation pulses may be selected
(optionally) to be 25% or 33.3%. The output of the pulse generator controls the output driver that can provide a
maximum current of 5 mA.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV: 1.3 2005.12.15
Page 5 of 14
5 Page 
PCB WIRE LAYOUT SCHEMATIC
SC8521
Transmitting tube output ground line
The above IC only use to hint, not to specified.
The transmitting tube ground line and IC ground line should
layout separated or overstriking ground line.
Note:
* In wire layout, the power filter capacitor should near to IC.
* In wire layout, should avoid power line and ground line too long.
* Recommended infrared transmit unit and IC ground line should layout separated, or overstriking lines.
* The emitter of triode connect 1 resistor at least.
* Recommended triode use 9014.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV: 1.3 2005.12.15
Page 11 of 14
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet SC8521.PDF ] | |
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