8 Channel Capacitive Touch Sensor with 2 LED Drivers
Datasheet
‘1’ - If an MTP event occurs, the ALERT# pin will be asserted.
5.16
Multiple Touch Pattern Register
Table 5.28 Multiple Touch Pattern Register
B6 B5 B4 B3
ADDR
R/W
REGISTER
B7
B2
B1
B0
DEFAULT
Multiple
Touch
Pattern
CS8_
PTRN
CS7_
PTRN
CS6_
PTRN
CS5_
PTRN
CS4_
PTRN
CS3_
PTRN
CS2_
PTRN
CS1_
PTRN
2Dh
R/W
FFh
The Multiple Touch Pattern register acts as a pattern to identify an expected sensor input profile for
diagnostics or other significant events. There are two methods for how the Multiple Touch Pattern
register is used: as specific sensor inputs or number of sensor input that must exceed the MTP
threshold or have Noise Flag Status bits set. Which method is used is based on the COMP_PTRN bit
(see Section 5.15). The methods are described below.
1. Specific Sensor Inputs: If, during a single polling cycle, the specific sensor inputs above the MTP
threshold or with Noise Flag Status bits set match those bits set in the Multiple Touch Pattern
register, an MTP event is flagged.
2. Number of Sensor Inputs: If, during a single polling cycle, the number of sensor inputs with a delta
count above the MTP threshold or with Noise Flag Status bits set is equal to or greater than the
number of pattern bits set, an MTP event is flagged.
Bit 7 - CS8_PTRN - Determines whether CS8 is considered as part of the Multiple Touch Pattern.
‘0’ - CS8 is not considered a part of the pattern.
‘1’ - CS8 is considered a part of the pattern, or the absolute number of sensor inputs that must
have a delta count greater than the MTP threshold or have the Noise Flag Status bit set is
increased by 1.
Bit 6 - CS7_PTRN - Determines whether CS7 is considered as part of the Multiple Touch Pattern.
Bit 5 - CS6_PTRN - Determines whether CS6 is considered as part of the Multiple Touch Pattern.
Bit 4 - CS5_PTRN - Determines whether CS5 is considered as part of the Multiple Touch Pattern.
Bit 3 - CS4_PTRN - Determines whether CS4 is considered as part of the Multiple Touch Pattern.
Bit 2 - CS3_PTRN - Determines whether CS3 is considered as part of the Multiple Touch Pattern.
Bit 1 - CS2_PTRN - Determines whether CS2 is considered as part of the Multiple Touch Pattern.
Bit 0 - CS1_PTRN - Determines whether CS1 is considered as part of the Multiple Touch Pattern.
5.17
Recalibration Configuration Register
Table 5.29 Recalibration Configuration Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
NO_
CLR_
INTD
NO_
CLR_
NEG
Recalibration
Configuration
BUT_
LD_TH
NEG_DELTA_
CNT[1:0]
2Fh
R/W
CAL_CFG[2:0]
8Ah
SMSC CAP1128
Revision 1.32 (01-05-12)
DATA5S7HEET
SMSC [ SMSC CORPORATION ]
