FUNCTIONAL DESCRIPTION

I- I

This is the standard I

The device address is ”1101000” ; the first byte is therefore Hex D0 for a write operation and Hex D1 for a

read operation.

I.1 - Write Operation

The first byte is the device address plus the direction bit (R/W = 0).

The second byte contains the internal address of the first register to be accessed.

The next byte is written in the internal register.

The following (if any) bytes are written in successive internal registers.

The transfer lasts until stop conditions are encountered.

The STV0196B acknowledges every byte transfer.

I.2 - Read Operation

The address of the first register to read is programmed in a write operation without data, and terminated

by stop condition.

Then another start is followed by the device address and R/W = 1 ; all successive bytes are now data read

at successive positions starting from the initial address.

The STV0196B acknowledges every byte transfer.

Example :

Write registers 0 to 3 with AA,BB,CC,DD

Start

Device Address,

Write D0

ACK

Internal

Address

ACK

Data

AA

ACK

Data

BB

ACK

Data

CC

ACK

Stop

Read registers 2 and 3

Start

Device Address,

Write D0

ACK

Register Address 01

ACK

Stop

Start

Device Address,

Read D1

ACK

Data Read

BB

ACK

Data Read

CC

ACK

Stop

I.3 - Identification Register

This read only register gives the release number of the circuit in order to ensure software compatibility.

The read value is Hex 83 for STV0196B and Hex 81 for STV0196.

Internal Address : Hex 0B

1

0

0

000

11

Notes : - Unspecified register addresses must not be used.

- All the unused bits in the registers must be programmed to 0.

STV0196B

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