ST25TV02K datasheet(31/90 Pages) STMICROELECTRONICS

31 / 90 page

t2 is also the time after which the VCD may send a new request to the ST25TV02K/512, as described in

Figure 8. ST25TV02K/512 protocol timing.

Values of t2 are given in Table 39. Timing values.

t3: VCD new request delay when no response is received from the VICC

t3 is the time after which the VCD may send an EOF to switch to the next slot when no ST25TV02K/512 response

has been received.

The EOF sent by the VCD may be either 10% or 100% modulated regardless of the modulation index used for

transmitting the VCD request to the ST25TV02K/512.

From the time the VCD has generated the rising edge of an EOF:

•

If this EOF is 100% modulated, the VCD waits for a time at least equal to t3min for 100% modulation before

sending a new EOF.

•

If this EOF is 10% modulated, the VCD waits for a time at least equal to t3min for 10% modulation before

sending a new EOF.

Table 39. Timing values

Minimum (min) values

Nominal (nom) values

Maximum (max) values

100% modulation

10% modulation

4320 / fc = 318.6 µs

4352 / fc = 320.9 µs

4384 / fc = 323.3 µs(1)

4192 / fc = 309.2 µs

No tnom

No tmax

t1max(2)+tSOF(3)

t1max(2)+tNRT (4)+t2min

No tnom

No tmax

1. VCD request will not be interpreted during the first milliseconds following the field rising.

2. t1max does not apply for write-alike requests. Timing conditions for write-alike requests are defined in the command

description.

3. tSOF is the time taken by the ST25TV02K/512 to transmit an SOF to the VCD. tSOF depends on the current data rate: High

data rate or Low data rate.

4. tNRT is the nominal response time of the ST25TV02K/512. tNRT depends on VCD to ST25TV02K/512 data rate and

sub-carrier modulation mode.

Note:

The tolerance of specific timing is ±32 / fC.

6.4

RF commands

6.4.1

RF command code list

The ST25TV02K/512 support the following legacy and extended RF command set:

•

Inventory, used to perform the anticollision sequence.

•

Stay Quiet, used to put the ST25TV02K/512 in quiet mode, where it does not respond to any inventory

command.

•

Select, used to select the ST25TV02K/512. After this command, the ST25TV02K/512 process all Read/

Write commands with Select_flag set.

•

Reset To Ready, used to put the ST25TV02K/512 in the ready state.

•

Read Single Block, used to output the 32 bit of the selected block and its locking status.

•

Write Single Block, used to write and verify the new content for an update of a 32 bit block, provided that it

is not in a locked memory area.

•

Read Multiple Blocks, used to read the selected 32 bit blocks and their locking statuses, and send back

their value.

•

Write AFI, used to write the 8-bit value in the AFI register.

•

Lock AFI, used to lock the AFI register.

•

Write DSFID, used to write the 8-bit value in the DSFID register.

ST25TV02K ST25TV512

RF commands

DS12074 - Rev 11

page 31/90

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