ST7540 datasheet(16/44 Pages) STMICROELECTRONICS

16 / 44 page

Functional description

ST7540

16/44

Functional description

6.1

Carrier frequencies

ST7540 is a multi frequency device: eight programmable Carrier Frequencies are available

(see Table 6).

Only one Carrier can be used a time. The communication channel could be varied during

the normal working Mode to realize a multi frequency communication.

Selecting the desired frequency in the Control Register the Transmission and Reception

filters are accordingly tuned.

6.2

Baud rates

ST7540 is a multi Baud rate device: four Baud Rate are available (See Table 8).

Table 6. Channels List

FCarrier

F (KHz)

82.05

110

F7 (1)

Default value

132.5

Table 7. ST7540 mark and space tones frequency distance Vs. baud rate and deviation

Baud Rate [Baud]

∆F (1)(Hz)

Frequency deviation

Deviation (2)

Deviation =

∆F / (Baud Rate)

600

1 (3)

Deviation 0.5 not allowed

1200

600

1200

0.5

2400 (4)

1200 (4)

2400

Default value

0.5

4800

2400

4800

0.5

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