pca8885 NXP Semiconductors, pca8885 Datasheet - Page 19

• Manufacturer Part Number: pca8885
• Description: Capacitive 8-channel Proximity Switch With Auto-calibration And Very Low Power Consumption
• Manufacturer: NXP Semiconductors

NXP Semiconductors
13. Characteristics of the I
PCA8885
Objective data sheet
13.1.1 START and STOP conditions
13.1 Bit transfer
The PCA8885 has an I
transmitter. SDA and SCL are the data I/O and clock lines for the serial I
is used as an input or as an open-drain output. SDA is actively pulled LOW and is
passively held HIGH by the external pull-up resistor on the I
In order to provide high link robustness, the I
compatible and provides a robust addressing and command scheme.
One data bit is transferred during each clock pulse. The data on the SDA line must remain
stable during the HIGH period of the clock pulse as changes in the data line at this time
are interpreted as a control signal (see
Both data and clock lines remain HIGH when the bus is not busy.
A HIGH-to-LOW change of the data line, while the clock is HIGH, is defined as the START
condition (S).
A LOW-to-HIGH change of the data line, while the clock is HIGH, is defined as the STOP
condition (P).
The START and STOP conditions are shown in
Fig 9.
Fig 10. Definition of START and STOP conditions
SDA
SCL
Bit transfer
START condition
All information provided in this document is subject to legal disclaimers.
2
SDA
SCL
C-bus
S
Rev. 1 — 24 November 2011
2
C serial interface which operates as a slave receiver or
Capacitive 8-channel proximity switch with auto-calibration
data valid
data line
stable;
Figure
2
C interface of the PCA8885 is Fast-mode
allowed
change
of data
9).
Figure
10.
2
C-bus.
STOP condition
mba607
P
PCA8885
© NXP B.V. 2011. All rights reserved.
2
C Interface. SDA
mbc622
SDA
SCL
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