AN2960 datasheet(13/41 Pages) STMICROELECTRONICS

13 / 41 page

AN2960

Digital interfaces

Doc ID 15557 Rev 1

13/41

Figure 3.

I2C subsequences

ST: START condition

SCL

1111

SDA

1100

SR: Repeated START condition

SCL

1111

SDA

1100

SAD: Slave address (binary address: abcdefgh. In LIS331DL “abcdef” = “001110”)

SCL

00110

0110

SDA

0aaaa

bbbb

cccc

dddd

eeee

f f f f

gggg

hhhh

Bit g=0 if SDO connected to GND, g=1 if SDO pad connected to Vdd

Bit h=0 => write, h=1 => read

SAK: Slave acknowledge (Z means high impedance)

SCL

0011

SDA (force)

ZZZZ

Check that SDA is 0 after SCL=1

SDA (read)

XX00

SUB: Sub address (binary address: a0cdefgh)

SCL

00110

0110

SDA

0aaaa

0000

cccc

dddd

eeee

f f f f

gggg

hhhh

Bit a=0 => do not increment address in multiple mode

a=1 => increment address in multiple mode

DATA (Master): send DATA byte (binary number: abcdefgh)

SCL

00110

0110

Saaaa

bbbb

cccc

dddd

eeee

f f f f

gggg

hhhh

DATA (Slave): read DATA byte (binary number: abcdefgh)

SCL

00110

0110

SDA (force)

ZZZZ

SDA (read)

SP: STOP condition

SCL

1111

SDA

0011

MAK: Master Acknowledge

SCL

0011

SDA

0000

NMAK: No Master Acknowledge

SCL

0011

SDA

ZZZZ or 1111

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