M3004LD datasheet(4/14 Pages) STMICROELECTRONICS

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M3004LD

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Table 1. Pulse Train Timing

Note: The following number of pulses may be selected by Metal option: N= 8, 12, 16.

The different dividing ratio for TO and tW between flash mode and carrier mode is obtained by changing the modulo of a particular

divider from divide by 3 during flash mode to divide by 4 during carrier mode. This allows the use of a 600kHz ceramic resonator during

carrier mode to obtain a better noise immunity for the receiver without a significant change in TO and tW. For first samples, the correct

divider ration is obtained by a metal mask option. For final parts, this is automatically done together with the selection of flash-/carrier

mode.

Table 2. Pulse Train Separation (tb)

Mode

TO (ms)

tP (µs)

tM (µs)

tML (µs)

tMH (µs)

tW (ms)

Flashed

2.53

8.8

121

Modulated

2.53

26.4

17.6

8.8

121

fOSC

455kHz

tOSC = 2.2ms

4 x tOSC

Flashed Pulse Width

12 x tOSC

Modulation Period

tML

8 x tOSC

Modulation Period Low

tMH

4 x tOSC

Modulation Period High

55296 x tOSC

Word Distance

1152 x t OSCb

Basic Unit of Pulse Distance

Code

Logic ”0”

2 x TO

Logic ”1”

3 x TO

Toggle Bit Time

2 x TO or 3 x TO

Reference Time

3 x TO

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