pca8885 NXP Semiconductors, pca8885 Datasheet - Page 11

• 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
10.2.1.1 Main operating modes
10.2.1.2 Switching modes
10.2.1 Operating modes
Table 6.
[1]
All bits in this register can be written and read with the write-config and read-config
commands.
The PCA8885 can operate in three operating modes: as a stand-alone device or in a
cascade as a primary-chip or a secondary-chip (see
Table 7.
[1]
The operating modes are implemented to support the application of two PCA8885 in the
system (see
There is a one to one relationship between the channels INx and the bits in the SENS
register. The indication of the switching status of each channel is controlled by the two
switching modes supported:
Bit
2
1
0
Conditions of
clock source
oscillator
clock output pin CLK_OUT
clock input pin CLK_IN
Default value.
Default operating mode after power-on.
Symbol
VROF
INTM
MSKMODE
CONFIG - configuration register bit description
Main operating modes
Section 13.8 on page
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Rev. 1 — 24 November 2011
Capacitive 8-channel proximity switch with auto-calibration
Value
0
1
0
1
0
1
Stand-alone
internal oscillator
enabled
disabled
disabled
[1]
[1]
[1]
22).
[1]
Description
voltage regulation
interrupt generation mode
channel masking mode
voltage regulation on
voltage regulation off
an interrupt is generated by
each bit changed in the
SENS register (press and
release)
an interrupt is generated by
each bit set in the SENS
register (press only)
normal power:
masked out channels
remain operational
low power:
masked out channels are
powered down
Main operating modes
Primary-chip
internal oscillator
enabled
enabled
disabled
Table
…continued
7).
PCA8885
Secondary-chip
clock input
disabled
disabled
enabled
© NXP B.V. 2011. All rights reserved.
Reference
Section 11
Section 10.2.2
Section 10.5.1
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