M24LR64E-R datasheet(78/140 Pages) STMICROELECTRONICS

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Timing definition

M24LR64E-R

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Doc ID 022712 Rev 3

Timing definition

25.1

t1: M24LR64E-R response delay

Upon detection of the rising edge of the EOF received from the VCD, the M24LR64E-R

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 35. The EOF is defined

in Figure 22.

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 M24LR64E-R responses have been received during an Inventory command. It starts

from the reception of the EOF from the M24LR64E-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 M24LR64E-R.

t2 is also the time after which the VCD may send a new request to the M24LR64E-R, as

described in Figure 48.

Values of t2 are given in Table 35.

25.3

t3: VCD new request delay when no response is received

from the M24LR64E-R

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

M24LR64E-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 M24LR64E-R.

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 before

sending a new EOF.

●

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

+ the M24LR64E-R nominal response time (which depends on the M24LR64E-R data

rate and subcarrier modulation mode) before sending a new EOF.

Table 35.

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 M24LR64E-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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