Datasheet

17
9596A–AT42–10/10
AT42QT1070
4.4 SDA, SCL
The I
2
C-compatible bus transmits data and clock with SDA and SCL respectively. They are
open-drain; that is I
2
C-compatible master and slave devices can only drive these lines low or
leave them open. The termination resistors pull the line up to Vdd if no I
2
C-compatible device is
pulling it down.
The termination resistors commonly range from 1 k to 10 k
and should be chosen so that the
rise times on SDA and SCL meet the I
2
C-compatible specifications (1 µs maximum).
Standalone mode: if I
2
C-compatible communications are not required, then standalone mode
can be enabled by connecting the MODE pin to Vdd. See Section 2.4 on page 9 for more
information.