SA8803 datasheet(6/10 Pages) SAMES

Part #	SA8803

Description	LIGHT EMITTING DIODE DRIVER

PDF	10 Pages

Scroll/Zoom	100%

Manufacturer	SAMES [Sames]

Direct Link	http://www.sames.co.za

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6 / 10 page

SA8803

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The acceptable Clock pulse Period (T

O) may be calculated as follows:

The rising edge may not shift more than half a bit period (B

P), therefore:

11 x B

P - (½ x BP) <11 x 8 x TO < 11 x BP (½ x BP)

Therefore:

11 x 8 x T

O = 11 x BP ± (½ x BP)

.·.

O = (BP ÷ 8) ±

P ÷ 8)

.·.

O = (BP ÷ 8) ± 4,55%

The acceptable frequency for the clock F

O is calculated as follows:

O =

.·. F

O =

P ÷ 8) (1 ±

1 )

But because:

R x 8 =

P ÷ 8)

where B

R = Baud Rate

O = (BR x 8) x

(1 ± 22)

.·.

O = BR x 8 ± 4.55%

The SA8803 has been specified for an external clock frequency of 8 times the Baud

Rate ± 3%.

FIGURE 3: TIMING DIAGRAM

CLK

DR-00596

456

F 0

8 x S CLK

DATA

CLK

B P

BIT 11

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