PCF7936AS/3851/C,1-CT NXP Semiconductors, PCF7936AS/3851/C,1-CT Datasheet - Page 21

• 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)
7.5 Read Only Modes
If the device is configured for one of three Read Only
modes, it will cyclically transmit data while operating in
READ ONLY state. The corresponding Read Only mode is
selected by the configuration bit MS1 and MS0, located in
the EEPROM, see section 7.1.4.
In Read Only mode, the data rate and coding is fixed as
specified and cannot be altered for the corresponding
mode. Data is transmitted until an LF Field Power-On
Reset terminates the READ ONLY state.
7.5.1 ISO 11784/5 (MS1 = 0, MS0 = 0)
If the Read Only mode ISO 11784/85 is selected, the
device cyclically transmits user page 4 to 7, see Figure 16.
The rate is fixed to 32 T
encoding is applied.
2010 May 04
Figure 16. Sequence for ISO 11784/85 Read Only mode
Figure 17. Sequence for MIRO Read Only mode
Figure 18. Sequence for PCF7931/30/35 Read Only mode
SEND to
Transponder
RECEIVED from
Transponder
SEND to
Transponder
RECEIVED from
Transponder
SEND to
Transponder
RECEIVED from
Transponder
t
t
t
WAIT,RO
WAIT,RO
WAIT,RO
O
bit 31 ............ bit 0
bit 31 ............ bit 0
bit 31 ............ bit 0
per bit (T
page 4
page 4
page 4
BIT
= 32 T
bit 31 ............ bit 0
bit 31 ............ bit 0
bit 31 ............ bit 0
O
) and CDP
page 5
page 5
page 5
bit 31 ............ bit 0
bit 31 ............ bit 0
bit 31 ............ bit 0
21
page 6
page 4
page 6
7.5.2 MIRO Mode (MS1 = 0, MS0 = 1)
If the Read Only mode MIRO is selected, the device
cyclically transmits user page 4 to 5, see Figure 17.
The rate is fixed to 64 T
Manchester encoding is applied.
7.5.3 PCF7931/30/35 (MS1 = 1, MS0 = 0)
If the Read Only mode PCF7931/30/35 is selected, the
device cyclically transmits user page 4 to 7, while inserting
a PMC pattern, as known from the PIT transponder family
(PCF7931/30), see Figure 18.
However, the modified PMC pattern implemented for the
PCF7936AS does not fully comply with the one used for the
PIT family.
The rate is fixed to 64 T
encoding is applied.
bit 31 ............ bit 0
bit 31 ............ bit 0
page 7
page 7
O
128 T
bit 31 ............ bit 0
per bit (T
modified PMC
O
O
per bit (T
page 4
192 T
Product Specification
64 T
BIT
PCF7936AS
= 64 T
O
O
BIT
CONFIDENTIAL
bit 31 .....
= 64 T
page 4
O
) and CDP
O
) and