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Description
The SC8521 is an electronic component model that 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.
Specifications and 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 factorApplication Scenarios
The SC8521 electronic component is commonly used in infrared remote control transmitters. It is suitable for applications that require the RC5 protocol and can accommodate a maximum of 56 keys (20-pin version). It offers the option of a multi-system or single system transmitter, with up to 8 systems available for selection. The IC also features power-down and key wake-up functionality, high output current of ≤45mA, and an oscillator frequency of 432KHz. It also provides multiple key protection and the choice of a 25% or 33% duty factor.
Comparison
Advantages- Generates output pulses according to the RC5 protocol
- Suitable for infrared remote control transmitters
- Can accommodate up to 56 keys (20-pin version)
- Option of multi-system or single system transmitter
- Power-down and key wake-up functionality
- High output current of ≤45mA
- Oscillator frequency of 432KHz
- Multiple key protection
- Option of 25% or 33% duty factorDisadvantages- Does not contain a software programmable processor
- Additional external capacitors required for 432KHz oscillator frequency
- Selection of systems may require jumper wire or switch -
Similar parts: 430483 , Click to view
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Datasheet
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Shopping guide
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- Last Updated: 2024/06/13 06:58 +0800
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