U2731B Datasheet, PDF (13/25 Pages) ATMEL Corporation – DAB ONE- CHIP FRONT END

U2731B
Simple Two-wire Bus
Timing
The values of the periods shown are specified in the table “Electrical Characteristics” on
page 15. More detailed information can be taken from the “Application Note 1.0 (Two-
wire Bus Description)”. Please note, that due to the two-wire bus specification, the MSB
of a byte is transmitted first, the LSB last.
Figure 4. Two-wire Bus Timing
Stop Start
Start
Stop
SDA
t_buf
t_r
t_f
SCL
t_hdsta t_low
t_hddat t_high
t_sudat
t_hdstat
t_susta
t_sustp
Figure 5. Typical Pulse Diagram
START
ADDRESS BYTE ACK
A BYTE 1
ACK
A BYTE 2
ACK
SDA
SCL
SDA
SCL
A BYTE 3
ACK
C BYTE 1
ACK
C BYTE 2
ACK STOP
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4671C–DAB–06/04