M24LR64-R datasheet(72/126 Pages) STMICROELECTRONICS

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Timing definition

M24LR64-R

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Doc ID 15170 Rev 8

Timing definition

25.1

t1: M24LR64-R response delay

Upon detection of the rising edge of the EOF received from the VCD, the M24LR64-R waits

for a time t1nom before transmitting its response to a VCD request or before switching to the

next slot during an inventory process. Values of t1 are given in Table 32. The EOF is defined

in Figure 22 on page 45.

25.2

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 M24LR64-R responses have been received during an Inventory command. It starts

from the reception of the EOF from the M24LR64-Rs.

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 M24LR64-R.

t2 is also the time after which the VCD may send a new request to the M24LR64-R as

described in Table 48: M24LR64-R protocol timing.

Values of t2 are given in Table 32.

25.3

t3: VCD new request delay in the absence of a response from

the M24LR64-R

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

M24LR64-R 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 M24LR64-R.

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

●

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

sending a new EOF.

●

If this EOF is 10% modulated, the VCD waits a time at least equal to the sum of t3min +

the M24LR64-R nominal response time (which depends on the M24LR64-R data rate

and subcarrier modulation mode) before sending a new EOF.

Table 32.

Timing values(1)

The tolerance of specific timings is ± 32/fC.

Minimum (min) values

Nominal (nom) values

Maximum (max) values

318.6 µs

320.9 µs

323.3 µs

309.2 µs

No tnom

No tmax

t1max

(2) + t

SOF

(3)

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

command description.

tSOF is the time taken by the M24LR64-R to transmit an SOF to the VCD. tSOF depends on the current data

rate: High data rate or Low data rate.

No tnom

No tmax

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