AS3820 datasheet(38/52 Pages) DIALOG

38 / 52 page

AS3820

16-Channel White LED Controller for LCD Backlight

Rev. 1.1

Datasheet

www.dialog-semiconductor.com

38 of 52

05-Feb-2019

8.8.3 SPI Device Address Enumeration

The device address of each driver is automatically set by the position of the device in the chain.

The first device has DevAddr = 0x01, the second device has DevAddr = 0x02 and so on. Device Addresses 0x00 and

0x3F are used for special broadcast writing commands described below.

8.8.4 SPI Protocol

Data Types

When xCS=0 all slaves will be activated. The addressing and data section is organized in byte packages. Each

message can be built with the following bytes:

DevAddr[5:0]

Addresses a specific driver and defines protocol information

Bit

Meaning

Value

Broadcast

B=1...Broadcast message to all devices

B=0...Normal message to one single device

Singlebyte

S=0...Block data read or write

S=1...Single data transmission (only one byte)

DevAddr[5:0]

Device Address

0x00 Write/read same data to same register of all devices (B=1)

0x01 to 0x3E. Device addresses for device 1 to 62

0x3F Write different data to same register of all devices (B=1)

Table 1: Device Address

NrOfdata[7:0]

Defines the number of data bytes in the data frame if S=0

Bit

Meaning

Value

NrOfdata[7:0]

Number of data

bytes in frame

0x00 to 0xFF

Table 2: Number of Data

RegAddr[6:0]

Bit

Meaning

Value

Read/Write

RW=0 Write to register address

RW=1 Read from register address

RegAddr[6:0]

Select register

address

0x00 to 0x60

Table 3: Register Address

AS3820 датащи(PDF) 38 Page - Dialog Semiconductor

AS3820 датащи(HTML) 38 Page - Dialog Semiconductor

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

датащи скачать

ссылки URL