ST25TV16K datasheet(28/87 Pages) STMICROELECTRONICS

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6.3

Timing definition

t1: ST25TV16K/64K response delay

Upon detection of the rising edge of the EOF received from the VCD, the ST25TV16K/64K waits for a t1nom time

before transmitting its response to a VCD request or switching to the next slot during an inventory process. Values

of t1 are given in Table 36. Timing values.

t2: VCD new request delay

t2 is the time after which the VCD may send an EOF to switch to the next slot when one or more ST25TV16K/64K

responses have been received during an Inventory command. It starts from the reception of the EOF from the

ST25TV16K/64Ks.

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 ST25TV16K/64K.

t2 is also the time after which the VCD may send a new request to the ST25TV16K/64K, as described in

Figure 6. ST25TV16K/64K protocol timing.

Values of t2 are given in Table 36. Timing values.

t3: VCD new request delay when no response is received from the ST25TV16K/64K

t3 is the time after which the VCD may send an EOF to switch to the next slot when no ST25TV16K/64K 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 ST25TV16K/64K.

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 36. 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 ST25TV16K/64K 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 ST25TV16K/64K. tNRT depends on VICC to ST25TV16K/64K data rate and subcarrier modulation

mode.

Note:

The tolerance of specific timing is ± 32/fC.

ST25TV16K ST25TV64K

Timing definition

DS11489 - Rev 9

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