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PDF PCF7936AS Data sheet ( Hoja de datos )
| Número de pieza | PCF7936AS | |
| Descripción | Security Transponder | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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PCF7936AS
Security Transponder (HITAG2)
Product Specification
CONFIDENTIAL
2010 May 04
Free Datasheet http://www.datasheet4u.com/
1 page  
NXP Semiconductors
Security Transponder (HITAG2)
Product Specification
PCF7936AS
4 BLOCK DIAGRAM
The PCF7936AS features a high degree of integration and
incorporates the transponder chip, coil and capacitor
assembled in a leadless stick package, see Figure 1.
Security Transponder
• Contactless Interface
• EEPROM (256 bit)
• Control Logic
• Calculation Unit (security algorithm)
• Reset Logic
• Test Logic
Security Transponder
IN1
IN2
Resonance/antenna circuit
fRES = 125 kHz (typ)
Security Transponder Chip
Contactless Interface
Rectifier
Voltage Limiter
EEPROM
(256 Bit)
Modulator
Clock
Recovery
Control Logic
Demodulator
LF Field
Power On Reset
Calculation
Unit
Test Logic
Figure 1. Block Diagram
5 TYPICAL APPLICATION
To Micro-
controller
Inductive Link
fSYS = 125 kHz (typ)
Basestation
Analog
Interface
Energy
Serial
Interface
PCF 7991
Write
Read
Figure 2. Typical System Configuration
Security Transponder
PCF 7936AS
Security Transponder Chip
Contactless Interface
Rectifier
Voltage Limiter
EEPROM
(256 Bit)
Modulator
Clock
Recovery
Control Logic
Demodulator
LF Field
Power On Reset
Calculation
Unit
Test Logic
2010 May 04
5 CONFIDENTIAL
Free Datasheet http://www.datasheet4u.com/
5 Page 
NXP Semiconductors
Security Transponder (HITAG2)
Product Specification
PCF7936AS
Error
LF Field
Power On Reset
READ ONLY
time-out (tWAIT,SA)
&
Read Only = enabled
WAIT
START_AUTH
READ_PAGE
READ_PAGE_INV
WRITE_PAGE
AUTHORIZED
HALT
HALT
Figure 7. Transponder State Diagram
7.2 Transponder State Diagram
Device operation is controlled by commands issued from
the basestation, see Figure 7.
After a LF Field Power-On Reset condition the circuitry is
reset and the transponder is initialized, which causes the
device to enter the WAIT state.
If one of the Read Only modes is enabled, the device will
enter READ ONLY state after the specified time-out
(tWAIT,SA), if no command is being issued.
To authenticate the transponder and to access the
Transponder Memory for read and write the AUTHORIZED
state has to be entered, by means of a START_AUTH
command and successful completion of the authentication
sequence. Subsequent memory read and write operations
may be executed.
Operation of the transponder commands depend on the
device configuration (Password or Cipher Mode).
If the device is forced into HALT state, by means of the
HALT command, the transponder circuitry is muted.
A violation of the command sequence coding or command
timing in any state causes an error condition, which causes
the device to enter WAIT state and to reset the time-out
(tWAIT,SA).
7.2.1 WAIT State
In WAIT state general memory access is denied.
Commands may be issued to start device authentication, in
order to enter the AUTHORIZED state, see Table 2.
Table 2. Command Set in WAIT State
NAME
Reserved 1)
Reserved 1)
Reserved 1)
Reserved 1)
Reserved 1)
START_AUTH
COMMAND, CMD
CM4 CM3 CM2 CM1 CM0
0XXXX
X0XXX
XX1XX
XXX1X
XXXX1
11000
Note
1. This command is reserved for future use and subject to
change without notice. The actual implementation
causes the device to generate an error condition and to
enter the WAIT state, if this command is being issued.
Upon entering the WAIT state the time-out (tWAIT,SA) is
reset. In case tWAIT,SA is allowed to time-out, the device
enters READ ONLY state, if one of the Read Only modes is
enabled. In case a START_AUTH command is issued,
device authentication is triggered and the READ ONLY
state is not entered. At least the first two bits of
START_AUTH need to be recognized by the device within
the time-out period specified by tWAIT,SA.
2010 May 04
11
CONFIDENTIAL
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet PCF7936AS.PDF ] | |
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