PCF7936AS/3851/C,1-CT NXP Semiconductors, PCF7936AS/3851/C,1-CT Datasheet - Page 17

• Manufacturer Part Number: PCF7936AS/3851/C,1-CT
• Description: pcf7936as series 32-bit 125 khz read / write security...
• Manufacturer: NXP Semiconductors

NXP Semiconductors
Security Transponder (HITAG2)
START_AUTH (Password Mode)
If configured for Password mode, START_AUTH triggers
the mutual device authentication sequence. If completed
successfully, the device enters AUTHORIZED state and
subsequently supports plain read and write access of the
Transponder Memory, TM. Device authentication employs
the
Transponder, PSW
After acceptance of the 5 bit command sequence, the initial
device Response consist of the 32 bit Identifier (IDE) that is
stored in the Transponder Memory. Subsequently, the
interrogating system (e.g. basestation) has to identify itself
towards the device, by issuing the matching 32 bit
Password Basestation, PSW
Password received with the one stores in the page 1. If
identical, the final device Response consist of the content
of page 3 that contains the Transponder and Memory
configuration (TMCF) and device Password Transponder
(PSW
2010 May 04
Figure 13. START_AUTH timing
Password
T
). The MSB is send first.
SEND to
Transponder
RECEIVED from
Transponder
Basestation,
T
, see Figure 13.
START_AUTH
CM[4:0]
1 1 0 0 0
B
. The device verifies the
PSW
SEND to
Transponder
RECEIVED from
Transponder
B
,
1 1 1 1 1
and
EQ
t
WAIT,Tr
Password
bit 31 ..............bit 0
IDE
17
In case the authentication process fails, an error condition
occurs that causes the device to terminate the command
and to enter WAIT state. The device will send no further
Response in this case.
Subsequent commands may be issued after termination of
the final t
For proper command execution, the interrogating system
has to identify itself towards the device within the specified
IDLE time, otherwise the device may generate a power-on
reset condition, upon which the circuitry would be reset and
the transponder initialized, causing the device to enter the
WAIT state.
1 1 1 1 1
EQ
t
WAIT,Tr
bit 31 ..............bit 0
WAIT,Bs
t
t
bit 31 ..............bit 0
Page 1
WAIT,Bs
IDLE
.
Page 3
Product Specification
t
WAIT,Bs
PCF7936AS
CONFIDENTIAL