ATA5021 datasheet(4/13 Pages) ATMEL

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9145D–AUTO–05/10

ATA5021

Functional Description

3.1

Supply Voltage, Pin 6

The ATA5021 requires a stabilized supply voltage V

DD = 5V ±10% to comply with its electrical

characteristics. An external buffer capacitor of C = 10 nF may be connected between pin 6 and

GND.

3.2

RC Oscillator, Pin 8

The clock frequency, f, can be adjusted by the components R

1 and C1 according to the formula:

with

T = 0.18

× (C

1 + Cboard + 0.016) + 0.35 + [1.59 – (C1 + Cboard + 0.016)/85] × R1 ×

1 + Cboard + 0.016)

1 (kΩ) = external resistor at pin 8

1 (nF) = external capacitor at pin 8

board = 0.004 nF; this is the parasitic test board capacity caused by additional wiring on the test

assembly. With frequency calculations of original boards, this parasitic capacitor can be omitted.

Table 3-1.

Comparison Table Clock Period Calculation versus Measurement on Test Board

R1 (k

Ω)C1 (nF)

Period “T” (µs) by

New Formula

Period “T” (µs) by

Measurement

Deviation of New

Formula versus

Measurement

10.00

0.23

4.36

4.33

–0.3%

10.00

0.47

8.20

8.30

1.8%

10.00

1.04

17.26

17.10

1.4%

10.00

4.75

74.40

74.50

1.5%

10.00

10.49

156.30

152.00

–2.2%

32.91

0.23

13.45

13.25

–0.4%

32.91

0.47

25.99

26.13

1.9%

32.91

1.04

55.57

55.00

1.2%

32.91

4.75

242.10

241.50

1.2%

32.91

10.49

509.25

505.00

1.6%

46.70

0.23

18.92

18.50

–1.2%

46.70

0.47

36.69

36.63

0.8%

46.70

1.04

78.63

78.25

1.7%

46.70

4.75

343.03

341.25

0.6%

46.70

10.49

721.70

700.00

–1.6%

68.00

0.23

27.38

26.75

–1.4%

68.00

0.47

53.22

53.25

1.4%

68.00

1.04

114.25

112.50

1.5%

68.00

4.75

498.94

497.50

1.2%

68.00

10.49

1049.85

1020.00

0.0%

81.20

0.23

32.61

31.88

–1.1%

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