SX8661I07AULTRT Semtech, SX8661I07AULTRT Datasheet - Page 53

• Manufacturer Part Number: SX8661I07AULTRT
• Description: IC, Capacitive Button Touch And Proximity Controller, 8 SENSOR, MLPQ-28
• Manufacturer: Semtech

Specifications of SX8661I07AULTRT

• Controller Type: Capacitive Touch Screen
• Ic Interface Type: I2C
• Supply Voltage Range: 2.7V To 3.6V
• Operating Temperature Range: -40°C To +85°C

ADVANCED COMMUNICATIONS & SENSING
5.5 Button Parameters
Revision v3.2, January 2011
Button Parameters
Address
0x22
0x23
0x24
0x25
0x26
Name
BtnCfg
BtnAvgThresh
BtnCompNegThresh
BtnCompNegCntMax
BtnHysteresis
Bits Description
7:6 Defines the buttons and proximity events reporting method on I2C, AOI, GPO,
5:4 Defines the buttons interrupt (for all buttons and proximity).
3
2:0 Defines the number of samples at the scan period for determining a touch of a
7:0 Defines the positive threshold for disabling the processing filter averaging (one
7:0 Defines the negative offset compensation threshold (one value for all buttons and
7:0 Defines the number of ticks (below the negative offset compensation threshold)
7:0 Defines the button hysteresis corresponding to a percentage of the CAP
Buzzer (see Table 21 for details).
00: All
01: Single (default)
10: Strongest
11: Reserved
00 : Interrupts masked
01 : Triggered on Touch
10 : Triggered on Release
11 : Triggered on Touch and Release (default)
Defines the number of samples at the scan period for determining a release of a
button.
00 : no debounce, use incoming sample (default)
01 : 2 samples debounce
10 : 3 samples debounce
11 : 4 samples debounce
button.
00 : no debounce, use incoming sample (default)
01 : 2 samples debounce
10 : 3 samples debounce
11 : 4 samples debounce
value for all buttons and proximity).
If ticks are above the threshold, then the averaging is suspended.
0x00: 0
0x01: 4
…
0x50: 320 (default)
…
0xFF: 1020
proximity).
0x00: 0
0x01: 4
…
0xA0: 640 (default)
…
0xFF: 1020
which will initiate an offset compensation (one value for all buttons and proximity).
0x00: reserved
0x01: 1 sample (default)
…
0xFF: 255 samples
thresholds (defined in Table 15).
All buttons use the same hysteresis.
0x00: 0%
0x01: 1%
…
0x0A: 10% (default)
…
Low Power, Capacitive Button Touch and Proximity Controller
© 2011 Semtech Corp.
53
(8 sensors) with LED Drivers and Analog Output
www.semtech.com
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SX8661