ATA5423-PLSW datasheet(61/100 Pages) ATMEL

61 / 100 page

4841D–WIRE–10/07

ATA5423/ATA5425/ATA5428/ATA5429

Figure 9-10. Bit Error (TMODE = 0)

9.1.8

Recommended Lim_min and Lim_max for Maximum Sensitivity

The sensitivity measurements in the section “Low-IF Receiver” in Table 3-3 on page 12 and

Table 3-4 on page 12 have been done with the Lim_min and Lim_max values according to Table

9-3. These values are optimized for maximum sensitivity. Note that since these limits are opti-

mized for sensitivity, the number of checked bits, N

Bit-check, has to be at least 6 to prevent the

circuit from waking up to often in polling mode due to noise.

Demod_Out

Bit check ok

Byte n-1

Byte 1

Byte n+1

Preburst

Byte n

Start-up mode Bit-check mode

Receiving mode

Bit error

Table 9-2.

RX Modulation Scheme

Mode

ASK/_NFSK

T_MODE

Bit in TX/RX Data

Buffer

Level on Pin

SD0_TMDO

FSK_L → fFSK_H

FSK_H → fFSK_L

FSK_H

–

FSK_L

–

ASK off → fASK on

ASK on → fASK off

ASK on

–

ASK off

–

Table 9-3.

Recommended Lim_min and Lim_max Values for Different Bit Rates

RF (fXTAL)/

MHz

1.0 Kbit/s

BR_Range_0

XLim = 1

2.4 Kbit/s

BR_Range_0

XLim = 0

5 Kbit/s

BR_Range_1

XLim = 0

10 Kbit/s

BR_Range_2

XLim = 0

20 Kbit/s

BR_Range_3

XLim = 0

315

(12.73193)

Lim_min = 13 (261 µs)

Lim_max = 38 (744 µs)

Lim_min = 12 (121 µs)

Lim_max = 34 (332 µs)

Lim_min = 11 (55 µs)

Lim_max = 32 (156 µs)

Lim_min = 11 (28 µs)

Lim_max = 32 (78 µs)

Lim_min = 11 (14 µs)

Lim_max = 31 (38 µs)

345

(13.94447)

Lim_min = 13 (239 µs)

Lim_max = 38 (679 µs)

Lim_min = 12 (110 µs)

Lim_max = 34 (303 µs)

Lim_min = 11 (50 µs)

Lim_max = 32 (142 µs)

Lim_min = 11 (25 µs)

Lim_max = 32 (71 µs)

Lim_min = 11 (13 µs)

Lim_max = 31 (34 µs)

433.92

(13.25311)

Lim_min = 13 (251 µs)

Lim_max = 38 (715 µs)

Lim_min = 12 (116 µs)

Lim_max = 34 (319 µs)

Lim_min = 11 (53 µs)

Lim_max = 32 (150 µs)

Lim_min = 11 (27 µs)

Lim_max = 32 (75 µs)

Lim_min = 11 (13 µs)

Lim_max = 32 (37 µs)

868.3

(13.41191)

Lim_min = 13 (248 µs)

Lim_max = 38 (706 µs)

Lim_min = 12 (115 µs)

Lim_max = 34 (315 µs)

Lim_min = 11 (52 µs)

Lim_max = 32 (148 µs)

Lim_min = 11 (26 µs)

Lim_max = 32 (74 µs)

Lim_min = 11 (13 µs)

Lim_max = 32 (37 µs)

915

(14.13324)

Lim_min = 13 (235 µs)

Lim_max = 38 (670 µs)

Lim_min = 12 (109 µs)

Lim_max = 34 (299 µs)

Lim_min = 11 (50 µs)

Lim_max = 32 (140 µs)

Lim_min = 11 (25 µs)

Lim_max = 32 (70 µs)

Lim_min = 11 (12 µs)

Lim_max = 32 (35 µs)

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