ATA5811 datasheet(24/90 Pages) ATMEL

24 / 90 page

ATA5811/ATA5812 [Preliminary]

4689B–RKE–04/04

Figure 19. XTO Block Diagram

To find the right values used in the control registers 2 and 3 (see Table 20 on page 35

and Table 23 on page 36) the relationship between f

XTO and the fRF is shown

Table 12. To determine the right content the frequency at pin CLK as well as the output

frequency at RF_OUT in ASK mode can be measured, than the FREQ value can be cal-

culated according to Table 12 so that f

RF is exactly the desired radio frequency

XTAL1

XTAL2

10 pF

Divider

CLK

CLK_ON

(Control

Divider

/16

fDCLK

fXTO

Divider

/16

fXDCLK

Baud1

Baud0

XLim

8 pF

In IDLE mode and during Sleep mode (RX_Polling) the

switches S1 and S2 are open.

Amplitude

Detector

XTO_OK

(to Reset Logic)

VSOUT_OK

(from power supply)

DVCC_OK

(from power supply)

Table 12. Calculation of f

Frequency (MHz)

Pin 6

433_N868

CREG1

Bit(4)

XTO (MHz)

RF = fTX_ASK = fRX

TX_FSK_L

TX_FSK_H

433.92

AVCC

13.25311

fRF - 16.17 kHz

fRF + 16.17 kHz

868.3

GND

13.41191

RF - 16.37 kHz

RF + 16.37 kHz

315.0

AVCC

12.73193

RF - 15.54 kHz

RF + 15.54 kHz

XTO

32 5

FREQ

20,5

16384

----------------------------------

⎝⎠

⎛⎞

XTO

64 5

FREQ

20,5

16384

----------------------------------

⎝⎠

⎛⎞

XTO

24 5

FREQ

20,5

16384

----------------------------------

⎝⎠

⎛⎞

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