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SC8521 Datasheet

  • SC8521

  • INFRARED REMOTE CONTROL TRANSMITTER RC5

  • 16頁

  • SILAN

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Silan
Semiconductors
INFRARED REMOTE CONTROL
TRANSMITTER RC5
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.
SC8521
SOP-20
When two or more keys are activated simultaneously no
鈭?/div>
Power-down and key wake-up
鈭?/div>
High output current (鈮?5mA)
transmission will take place.
FEATURES
鈭?/div>
RC5 protocol
鈭?/div>
Maximum of 56 keys (20-pin version)
鈭?/div>
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.
鈭?/div>
Oscillator frequency of 432KHz
鈭?/div>
Multiple key protection
鈭?/div>
Option of 25% or 33% duty factor
ORDERING INFORMATION
SC8521
SOP-20
Package
PIN CONFIGURATIONS
XTAL1
XTAL2
SN7
SN0
SN1
SN2
SN3
SN6
SN4
1
2
3
4
5
6
7
8
9
20 VDD
19 Lout
18 VSS
17 DR6
SC8521
16 DR0
15 DR1
14 DR2
13 DR3
12 DR4
11 DR5
SN5 10
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
REV: 1.3
2002.03.01
1

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