Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
5.7
Noise Flag Status Registers
Table 5.10 Noise Flag Status Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
Noise Flag
Status 1
S7_
S6_
S5_
S4_
S3_
S2_
S1_
0Ah
R
R
-
00h
NOISE NOISE NOISE NOISE NOISE NOISE NOISE
Noise Flag
Status 2
S14_ S13_ S12_ S11_ S10_ S9_ S8_
NOISE NOISE NOISE NOISE NOISE NOISE NOISE
0Bh
-
00h
The Noise Flag Status registers store status bits that are generated from the analog block if the
detected noise is above the operating region of the analog detector. These bits indicate that the most
recently received data from the sensor is invalid and should not be used for touch detection.
Furthermore, so long as the bit is set for a particular channel, no decisions are made with the data.
The queues are not updated, a touch is not detected, and a release is not detected.
These bits are not sticky and will be cleared automatically if the analog block does not report a noise
error.
5.8
Lid Closure Status Registers
Table 5.11 Lid Closure Status Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
Lid Closure
Status 1
S7_
LID
S6_
LID
S5_
LID
S4_
LID
S3_
LID
S2_
LID
S1_
LID
0Ch
R
-
00h
Lid Closure
Status 2
S14_
LID
S13_
LID
S12_
LID
S11_
LID
S10_
LID
S9_
LID
S8_
LID
0Dh
R
-
00h
The Lid Closure Status registers bits are only set if the lid closure detection circuitry is enabled (see
Section 5.24, "Lid Closure Configuration Register"). These status bits indicate that the corresponding
Capacitive Touch Sensor exceeded the Lid Closure threshold. These bits will be set if a button press
is detected, because the Lid Closure threshold is a percentage of the Sensor Threshold.
These bits are used in combination with the Lid Closure Pattern register settings to determine when a
Lid Closure Event is flagged (see Section 5.26, "Lid Closure Pattern Registers").
These bits are not sticky and will be cleared automatically when the corresponding sensor count drops
below the lid closure count threshold. The device does not flag a sensor as above or below the
threshold until it has cycled through the queue (see Section 5.25, "Lid Closure Queue Control
Register").
APPLICATION NOTE: It is likely that recalibration will occur while the lid is closed, resulting in negative delta counts
until recalibration takes place.
SMSC CAP1014
Revision 1.65 (08-11-09)
DATA3S9HEET
SMSC [ SMSC CORPORATION ]
