pca8885 NXP Semiconductors, pca8885 Datasheet - Page 21

• 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
13.4 I
13.5 I
13.6 Fast-mode Plus (Fm+) support
13.7 Reading sensor data
Device selection depends on the I
data, and on the hardware subaddress.
Two I
Table 11.
The least significant bit of the slave address is bit R/W. Bit 1 of the slave address is
defined by connecting input A0 to either V
instances of PCA8885 can be distinguished on the same I
The I
condition (S) from the I
After acknowledgement, a command is sent, and after a further acknowledge a data byte
is transmitted. After the last data byte, the I
Alternatively a START may be asserted to RESTART an I
The Fast-mode Plus specification is supported. Besides providing a high transmission
speed, the main characteristic of Fast-mode Plus is the increased drive strength, allowing
lower impedance buses to be driven, and therefore less noise sensitive. Details on the
Fast-mode Plus specification are given in
The PCA8885 supports direct reading of the sensor state from the SENS register. If - after
sending the address - the R/W bit is immediately set to logic 1 without sending a
command, the circuit recognizes that it must immediately return the content of the SENS
register (see
Bit
Slave address
2
2
Fig 13. I
C-bus subaddress
C-bus protocol
2
2
C-bus protocol is shown in
C-bus slave addresses are used to address the PCA8885 (see
2
I
C-bus protocol
2
C slave address byte
Figure
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14)
S
Slave address
7
MSB
0
Rev. 1 — 24 November 2011
slave address
2
C-bus master which is followed by the slave address.
Capacitive 8-channel proximity switch with auto-calibration
6
1
R/W = 0
A
0
Figure
2
0
C-bus slave address, on the transferred command
A
5
0
13. The sequence is initiated with a START
command
SS
Ref. 13
2
C-bus master issues a STOP condition (P).
(logic 0) or V
4
0
“UM10204”.
A
3
0
2
DD
2
C-bus access.
C-bus.
data
(logic 1). Therefore, two
013aaa230
2
0
P
Table
PCA8885
© NXP B.V. 2011. All rights reserved.
1
A0
11).
0
LSB
R/W
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