ST7DALIF2 datasheet(91/171 Pages) STMICROELECTRONICS

91 / 171 page

ST7DALIF2

DALI communication module

91/171

16.3

DALI standard protocol

The DALI protocol uses the bi-phase Manchester asynchronous serial data format. All the

bits of the frame are bi-phase encoded except the two stop bits.

■ The transmission rate is about 1.2 kHz. The bi-phase bit period is 833.33 us ±10%.

■ A forward frame consists of 19 bi-phase encoded bits:

– 1 start bit (0->1: logical ’1’)

– 1 address byte (8-bit address)

– 1 data byte (8-bit data)

– 2 high level stop bits (no change of phase)

■ A backward frame consists of 11 bi-phase encoded bits:

– 1 start bit (0->1: logical ’1’)

– 1 data byte (8-bit data)

– 2 high level stop bits (no change of phase)

A forward frame consists of 19 bi-phase encoded bits: 1 start bit (logical ’1’), 1 address byte

and 1 data byte. The frame is terminated by 2 stop bits (idle). The stop bits do not contain

any change of phase.

A backward frame consists of 11 bi-phase encoded bits: 1 start bit (logical ’1’) and 1 data

byte. The frame is terminated by 2 stop bits (idle). The stop bits do not contain any change

of phase.

The transmission rate, expressed as a bandwidth, is specified at 1.2 kHz for the forward

channel and for the backward channel.

The settling time between two subsequent forward frames is 9.17 ms (minimum).

The settling time between forward and backward frames is between 2.92 ms and 9.17 ms. If

a backward frame has not been started after 9.17 ms, this is interpreted as "no answer".

In the event of code violation, the frame is ignored. After a code violation has occurred, the

system is ready again for data reception.

Figure 42.

DALI standard frame

stop bits

start bit

address byte

data byte

FORWARD FRAME

start bit

data byte

BACKWARD FRAME

stop bits

BI-PHASE LEVELS

Logical ’1’

Logical ’0’

2T = 833.33 us ±10%

ST7DALIF2 数据表(PDF) 91 Page - STMicroelectronics

ST7DALIF2 数据表(HTML) 91 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载