LIS2DS12 datasheet(35/68 Pages) STMICROELECTRONICS

35 / 68 page

DocID027753 Rev 4

35/68

LIS2DS12

Digital interfaces

Data are transmitted in byte format (DATA). Each data transfer contains 8 bits. The number

of bytes transferred per transfer is unlimited. Data is transferred with the Most Significant bit

(MSb) first. If a receiver can’t receive another complete byte of data until it has performed

some other function, it can hold the clock line, SCL low to force the transmitter into a wait

state. Data transfer only continues when the receiver is ready for another byte and releases

the data line. If a slave receiver doesn’t acknowledge the slave address (i.e. it is not able to

receive because it is performing some real-time function) the data line must be left high by

the slave. The master can then abort the transfer. A low-to-high transition on the SDA line

while the SCL line is high is defined as a STOP condition. Each data transfer must be

terminated by the generation of a STOP (SP) condition.

In the presented communication format MAK is Master acknowledge and NMAK is No

Master Acknowledge.

6.2

SPI bus interface

The LIS2DS12 SPI is a bus slave. The SPI allows writing and reading the registers of the

device.

The serial interface interacts with the outside world with 4 wires: CS, SPC, SDI and SDO.

Figure 14. Read and write protocol

Table 19. Transfer when master is writing multiple bytes to slave

Master

SAD + W

SUB

DATA

Slave

SAK

Table 20. Transfer when master is receiving (reading) one byte of data from slave

Master

SAD + W

SUB

SAD + R

NMAK

Slave

SAK

DATA

Table 21. Transfer when master is receiving (reading) multiple bytes of data from slave

Master ST SAD+W

SUB

SR SAD+R

MAK

NMAK SP

Slave

SAK

DATA

LIS2DS12 Datasheet(PDF) 35 Page - STMicroelectronics

LIS2DS12 Datasheet(HTML) 35 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

Datasheet Download

Link URL