M3005LD datasheet(4/10 Pages) STMICROELECTRONICS

4 / 10 page

Flash Mode

Carrier Mode

fOSC

455kHz

600kHz

4x tOSC

Flashed Pulse Width

12 x tOSC

tOSC

Modulation Period

Number of Modulation Pulses

1152 x tOSC

1536 x tOSC

Basic Unit of Pulse Distance

55296 x tOSC

73728 x tOSC

Word Distance

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

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

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

ing 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)

Code

Logic ”0”

2x TO

Logic ”1”

3x TO

Toggle Bit Time

2 x TO or 3 x TO

Table 3 : Transmission Mode and Sub-system

Adress Selection.

The sub-system address and the transmission

mode are defined by connecting the ADRM input

to one or more driver outputs (DRV0N To DRV6N)

of the key matrix. If more than one driver is con-

nected to ADRM, they must be decoupled by di-

odes.

Mode

Sub-system Address

Driver DRVnN for n =

012345

O= connected to ADRM

blank= not connected to ADRM

X = don’t care

Table 1 : Pulse Train Timing

Mode

TO (ms)

tP (

µs)

tM (

µs)

tW (ms)

Flashed

2.53

8.8

121

Modulated

2.53

tOSC

121

M3005LAB1 - M3005LD

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