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HCS515 Folha de dados(PDF) 16 Page - Microchip Technology

Nome de Peças HCS515
Descrição Electrónicos  KEELOQ Code Hopping Decoder
PDF  32 Pages
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Fabricante Electrônico  MICROCHIP [Microchip Technology]
Página de início  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

HCS515 Folha de dados(HTML) 16 Page - Microchip Technology

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HCS515
DS40183D-page 16
© 2002 Microchip Technology Inc.
5.2
Programming Waveform
The programming command consists of the following:
• Command Request Sequence (A to B)
• Command Byte (B to C)
• Configuration Byte (C to D)
• Manufacturer’s Code Eight Data Bytes (D to G)
• Activation and Acknowledge Sequence (G to H)
5.3
Programming Data String
A total of 80 bits are clocked into the decoder. The 8-bit
command byte is clocked in first, followed by the 8-bit
configuration byte and the 64-bit manufacturer’s code.
The data must be clocked in Least Significant bit (LSb)
first. The decoder will then encrypt the manufacturer’s
code using the decoder’s unique 64-bit EEPROM
encoder decryption key. After completion of the pro-
gramming EEPROM, the decoder will acknowledge by
taking the data line high (G to H). If the data line goes
high within 30 ms after the clock goes high, program-
ming also fails.
FIGURE 5-1:
PROGRAMMING WAVEFORM
MSB
A
Command Byte
START Command
TCLKL
TCLKH
TDS
BC
LSB
TSTART
TDATA
D
TDATA
E
Configuration Byte
Least Significant Byte
TDATA
TREQ
TRESP
CLK
µC Data
MSB
LSB
MSB
LSB
HCS515
Data
TDATA
G
Most Significant Byte
H
TACK
TWTH
Acknowledge
F
TWTL
LSB
MSB
TABLE 5-1:
PROGRAMMING COMMAND
Symbol
Parameters
Sugg. Value
Min.
Max.
Units
TREQ
Command request time
d.o.d.
0.005
500
ms
TRESP
Acknowledge time
100
10
1000
µs
TSTART
Command request to first command bit
100
20
1000
µs
TCLKH
Clock high time
100
20
1000
µs
TCLKL
Clock low time
100
20
1000
µs
TDS
Data hold time
50
14
1000
µs
TDATA
Command last bit to data first bit
100
10
1000
µs
TACK
Command acknowledge time
d.o.d.
30
240
ms
TWTH
Acknowledge respond time
100
20
1000
µs
TWTL
Clock low to next command
100
10
—
µs
Note:
d.o.d. - depends on decoder status
These parameters are characterized but not tested



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