Rainbow-electronics DAB-GPS-C01 Uživatelský manuál stáhnout pdf (Strana 9)

AMS0805WAH

MOTION SENSOR

Protocol

● Transaction Rules

Each data transferred on the SDA is accompanied by a pulse on the clock signal. The

data on the SDA must be stable when the clock is high. The only exception is for generating start

and stop. The master initiates and terminates a data transmission.

Start condition

: To start reading/writing operation, it is necessary to generate a start condition by

switching the SDA input from high level to low level when the SCL input is high

level.

Stop condition

: To stop reading/writing operation, it is necessary to generate stop condition by

switching the SDA input from low level to high level when the SCL input is high

level. When the stop condition is generated, the operation is stopped, the data

is processed and the system enters in standby mode.

● Single-Byte Write Sequence

The Single Byte Write Sequence is composed of 3 bytes of 9 bits, the 9

bit being the

acknowledgement. It starts by a start condition and ends by a stop condition. The first byte is the

Slave Address, the second is the Register Address and the third is the Data Byte. The LSB of the

Slave Code byte is the R/W indicator.

SDA

SCL

Start

Stop

00XWA

SCL

SDA

Slave address

0S65

Command

765

Data

MSB LSB MSB LSB MSB LSB

AAA

SDA SLAVE

SDA MASTER

10100XW0S6

4321076

432107P

MASTER Transmit & SLAVE Receive

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 27 28

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Rainbow-electronics DAB-GPS-C01 Uživatelský manuál Strana 9