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PCA8521

Features: ` RC5 protocol` Maximum of: 56 keys (20-pin version) 30 keys (16-pin version).` Option of multi-system or single system transmitter Multi-system: maximum 8 systems, selection by key Single system: maximum 8 different systems per IC, selection by jumper wire or switch.` Power-down and key...

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SeekIC No. : 004456264 Detail

PCA8521: Features: ` RC5 protocol` Maximum of: 56 keys (20-pin version) 30 keys (16-pin version).` Option of multi-system or single system transmitter Multi-system: maximum 8 systems, selection by key Single...

PCA8521 Data Sheet

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Part Number:
PCA8521
Supply Ability:
5000

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Product Details

Description



Features:

` RC5 protocol
` Maximum of:
56 keys (20-pin version)
30 keys (16-pin version).
` Option of multi-system or single system transmitter
Multi-system: maximum 8 systems, 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 ( 45 mA)
` Oscillator frequency of 432 kHz or 4 MHz
` Multiple key protection
` Option of 25% or 33% duty factor
` Contained in DIP16, SO16, DIP20 or SO20 packages.


Application

These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such improper use or sale.


Pinout

Connection Diagram


Description

The PCA8521 can be used in infrared remote control transmitters. PCA8521 generates output pulses, in accordance with the RC5 protocol, when a key is pressed. The IC does not contain a software programmable processor. However,PCA8521 does contain a ROM in which the codes that PCA8521 have to be transmitted are stored. An example of an application diagram using a 20-pin IC is illustrated in Fig.7. The oscillator frequency may be optionally chosen as 432 kHz or 4 MHz. For 432 kHz additional external capacitors must be connected. The capacitors for a 4 MHz oscillator is integrated. When a key in the key-matrix is pressed a drive line 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) PCA8521 and eight sense lines (SN0 to SN7) may be connected via the key matrix to scan the keys (see Fig.1).
When two or more keys are activated simultaneously no transmission will take place.




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