DRV201_15 Datasheet, PDF (14/29 Pages) Texas Instruments – DRV201 Voice Coil Motor Driver for Camera Auto Focus

DRV201
SLVSB25C – AUGUST 2011 – REVISED JUNE 2015
www.ti.com
Programming (continued)
7.5.2 I²C Device Address, Start and Stop Condition
Data transmission is initiated with a start bit from the controller as shown in Figure 12. The start condition is
recognized when the SDA line transitions from high to low during the high portion of the SCL signal. Upon
reception of a start bit, the device will receive serial data on the SDA input and check for valid address and
control information. SDA data is latched by DRV201 on the rising edge of the SCL line. If the appropriate device
address bits are set for the device, DRV201 issues the ACK by pulling the SDA line low on the next falling edge
after 8th bit is latched. SDA is kept low until the next falling edge of the SCL line.
Data transmission is completed by either the reception of a stop condition or the reception of the data word sent
to the device. A stop condition is recognized as a low to high transition of the SDA input during the high portion
of the SCL signal. All other transitions of the SDA line must occur during the low portion of the SCL signal. An
acknowledge is issued after the reception of valid address, sub-address and data words. Reference Figure 13.
SDA
...
SCL
1
2
3
4
5
6
7
8
9
...
START CONDITION
ACKNOWLEDGE
Figure 12. I²C Start/Stop/Acknowledge Protocol
STOP CONDITION
t_LOW
t_r
t_f
t_H(STA)
SCL
t_H(STA)
SDA
t_(BUF)
P
S
t_H(DAT)
t_HIGH
t_S(DAT)
t_S(STA)
S
Figure 13. I²C Data Transmission Protocol
t_S(STO)
P
14
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