CAP1106 Datasheet, PDF (31/48 Pages) Microchip Technology – 6 Channel Capacitive Touch Sensor

CAP1106
Bit 7 - MTP_EN - Enables the multiple touch pattern detection circuitry.
• ‘0’ (default) - The MTP detection circuitry is disabled.
• ‘1’ - The MTP detection circuitry is enabled.
Bits 3-2 - MTP_TH[1:0] - Determine the MTP threshold, as shown in Table 6-27. This threshold is a percentage of sensor
input threshold (see Section 6.18, "Sensor Input Threshold Registers") when the device is in the Fully Active state or of
the standby threshold (see Section 6.23, "Standby Threshold Register") when the device is in the Standby state.
TABLE 6-27: MTP_TH BIT DECODE
MTP_TH[1:0]
1
0
0
0
0
1
1
0
1
1
Threshold Divide Setting
12.5% (default)
25%
37.5%
100%
Bit 1 - COMP_PTRN - Determines whether the MTP detection circuitry will use the Multiple Touch Pattern register as a
specific pattern of sensor inputs or as an absolute number of sensor inputs.
• ‘0’ (default) - The MTP detection circuitry will use the Multiple Touch Pattern register bit settings as an absolute
minimum number of sensor inputs that must be above the threshold or have Noise Flag Status bits set. The num-
ber will be equal to the number of bits set in the register.
• ‘1’ - The MTP detection circuitry will use pattern recognition. Each bit set in the Multiple Touch Pattern register
indicates a specific sensor input that must have a delta count greater than the MTP threshold or have a Noise Flag
Status bit set. If the criteria are met, the MTP status bit will be set.
Bit 0 - MTP_ALERT - Enables an interrupt if an MTP event occurs. In either condition, the MTP status bit will be set.
• ‘0’ (default) - If an MTP event occurs, the ALERT# pin is not asserted.
• ‘1’ - If an MTP event occurs, the ALERT# pin will be asserted.
6.16 Multiple Touch Pattern Register
TABLE 6-28: MULTIPLE TOUCH PATTERN REGISTER
ADDR R/W Register
B7
B6
B5
B4
2Dh
R/W
Multiple
Touch Pattern
-
-
CS6_ CS5_
PTRN PTRN
B3
CS4_
PTRN
B2
CS3_
PTRN
B1
CS2_
PTRN
B0
CS1_
PTRN
Default
3Fh
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 6.15). 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 5 - CS6_PTRN - Determines whether CS6 is considered as part of the Multiple Touch Pattern.
• ‘0’ - CS6 is not considered a part of the pattern.
• ‘1’ - CS6 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 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.
 2015 Microchip Technology Inc.
DS00001624B-page 31