AN3255

Doc ID 17784 Rev 1

19/24

Appendix A

To start communicating with the CR14, the bus master initiates a START condition and

sends 8 bits (with Most Significant Bit first) on the serial data line SDA. These bits contain

the Device Select Code (7 bits) and the RWbar bit.

Code are the Device Type Identifier. For the CR14 these bits definition is given in Table 7.

operations.

If the data sent by the bus master matches the Device Select Code of the CR14, it returns

an acknowledgement on the bus during the 9th bit time. The CR14 device generates a

NACK if its Device Select Code does not correspond to the data sent. It deselects himself

from the bus and goes in standby mode.

Table 7.

Device Select code

Device Code

Chip Enable

RWbar

b7

b6

b5

b4

b3

b2

b1

b0

CR14

select

1

0

1

0

E2

E1

E0

RWbar