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SC8521

Features: 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. Power-down and key wake-up High output current...

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SeekIC No. : 004485734 Detail

SC8521: Features: 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 differen...

SC8521 Data Sheet

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Part Number:
SC8521
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

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.
  Power-down and key wake-up
  High output current (45mA)
Oscillator frequency of 432KHz
Multiple key protection
Option of 25% or 33% duty factor ORDERING INFORMATION


Pinout

Connection Diagram


Specifications

         Characteristic

Symbol

Value

  Unit

Supply Voltage

VDD

5

V

Power Dissipation

PD

25

mW

Thermal Derating
K∂
10
 mW/

Storage Temperature

TSTG

-65 ~ +150

 

Operating Temperature

TOPR

-20 ~ +80

 




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 requency 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.




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