SSM2380 datasheet(24/32 Pages) AD

24 / 32 page

SSM2380

Rev. A | Page 24 of 32

I2C INTERFACE

SDA generates the serial control data-word, and SCK clocks the

serial data. The I2C bus address (Bits[A7:A1]) is 0x31 (01100010

for write and 01100011 for read). Bit A0 is the designated

read/write bit.

The I2C interface provides access to the user-selectable control

registers and operates with a 2-wire interface.

Each control register consists of 16 bits, MSB first. Bits[B15:B9]

are the register map address, and Bits[B8:B0] are the register data

for the associated register map.

1TO 7

SDA

SCK

START

ADDR

R/W

ACK

SUBADDRESS

ACK

STOP

DATA

Figure 49. SSM2380 2-Wire I2C Generalized Clocking Diagram

WRITE

SEQUENCE

READ

SEQUENCE

SA1

A(S)

B15

...

A(S)

...

A(M)

...

DEVICE

ADDRESS

DEVICE

ADDRESS

SA1

A(S)

B15

...

DEVICE

ADDRESS

DATA

(SLAVE DRIVE)

DATA

S =

P =

A0 =

A(S) =

A(M) =

START BIT.

STOP BIT.

I2C R/W BIT.

ACKNOWLEDGE BY SLAVE.

ACKNOWLEDGE BY MASTER.

ACKNOWLEDGE BY MASTER (INVERSION).

Figure 50. I2C Write and Read Sequences

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