pca8885 NXP Semiconductors, pca8885 Datasheet - Page 13

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

NXP Semiconductors
PCA8885
Objective data sheet
10.2.2.2 Interrupt over the I
The interrupt generation is controlled by the INTM bit in the CONFIG register (see
on page
In 2-key mode the INT output is only activated after 2 bits have been set in the SENS
register.
The interrupt is automatically cleared when the system controller reads the SENS register.
Alternatively the INT can be cleared by using the clear-INT command, without reading the
actual sensor state.
In applications where the sensing plates are remote from the microcontroller, the interrupt
line can be saved by enabling the interrupt over I
The PCA8885 allows to flag an interrupt over the I
like an I
START condition immediately followed by a STOP condition. It is illustrated in
No further I
The system controller has to detect the START-STOP condition and react accordingly.
The interrupt over the I
soft-reset command it can be disabled.
In interrupt over the I
described in
Fig 5.
•
•
If INTM is logic 0 (default), then the change (set or clear) of each bit in register SENS
activates the INT output.
If INTM is logic 1, then only sensor press events, resulting in bits being set logic 1 in
the SENS register, activate the INT output. Sensor release events, which cause the
corresponding bit in SENS to be cleared (set logic 0), do not activate the INT output.
2
10).
C master with restricted functionality. The interrupt is signaled by setting a
Interrupt over the I
2
C master capabilities are supported.
Section
All information provided in this document is subject to legal disclaimers.
2
2
C-bus
10.2.2.1.
Rev. 1 — 24 November 2011
C-bus mode, the functionality of the INT output continues to work as
2
C-bus can be enabled with the int-over-I
Capacitive 8-channel proximity switch with auto-calibration
SDA
SCL
2
C-bus
START
t
w(int)
2
C-bus.
2
C-bus. The PCA8885 then behaves
STOP
013aaa313
2
C command. With the
PCA8885
© NXP B.V. 2011. All rights reserved.
Figure
Table 6
13 of 43
5.