SX8661I07AULTRT Semtech, SX8661I07AULTRT Datasheet - Page 54

• 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
The buttons and the proximity sensor operate in a similar way although some parameters can be set uniquely for
buttons or the proximity sensor only (according the previous tables describing the button and proximity
parameters).
A reliable button operation requires a coherent setting of the registers.
Figure 53 shows an example of a touch and a release. The ticks will vary slightly around the zero idle state.
When the touch occurs the ticks will rise sharply. At the release of the button the ticks will go down rapidly and
converge to the idle zero value.
Revision v3.2, January 2011
Button Parameters
Address
0x27
0x28
0x29
Name
BtnStuckAtTimeout
BtnStrongestHysteresis
BtnLongPressTimer
Bits Description
7:0 Defines the stuck at timeout for buttons and proximity.
7:0 Defines the hysteresis value for the strongest button filtering engine. This
7:0 Defines the long press button timeout on AOI pins (applicable in Single Reporting
0x64: 100%
0x00: OFF (default)
0x01: 1 second
…
0xFF: 255 seconds
parameter is only valid when BtnCfg has been configured to “report the strongest
touch”. The proximity sensor is excluded.
The hysteresis element eliminates the jittery output due to environmental noise
when two CAP sensors (configured as buttons) have values very close to each
other. The BtnStrongestHysteresis defines how much bigger the signal of the
second sensor needs to be compared to the strongest detected sensor, before the
second sensor becomes the strongest detected touch.
0x00: 0
0x01: 1
…
0x80: 128 (default)
…
0xFF: 255
Mode). The proximity sensor does not trigger the timer.
0x00: OFF (default)
0x01: 1 second
…
0xFF: 255 seconds
Low Power, Capacitive Button Touch and Proximity Controller
Table 20
© 2011 Semtech Corp.
Button Parameters
54
(8 sensors) with LED Drivers and Analog Output
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SX8661