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QST108CM0 数据表(PDF) 17 Page - STMicroelectronics

部件名 QST108CM0
功能描述  Capacitive touch sensor device 8 keys with individual key state outputs or I2C interface
PDF  51 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

QST108CM0 数据表(HTML) 17 Page - STMicroelectronics

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QST108
Device operating modes
17/51
4.5.3
Option descriptions
Adjacent key suppression (AKS™)
The QST108 features an adjacent key suppression (AKS™) function.
This function is enabled using the AKS option resistor (OPT2) in standard output mode as
described in Table 4. In BCD output mode, the AKS function is always enabled, regardless
of the option resistor configuration.
Low Power mode option
This option resistor (OPT3) selects whether the device is always sensing the keys or if a low
power consumption phase is introduced between bursts as described in Table 5.
In Low Power mode, a very low consumption (sleep) phase of 100ms is inserted between
the Group B burst and the Group A burst. This significantly reduces the overall consumption
of the device. Sleep duration is not accurate and can vary substantially depending on VDD
and temperature values.
Note:
In Low Power mode, the response time is increased.
Max On-Duration
There are four recalibration timing options (“Max On-Duration”). The recalibration option
resistors (OPT4 and OPT5) control how long it takes for a continuous detection to trigger a
recalibration on a key as described in Table 6. When such an event occurs, only the “stuck”
key is recalibrated.
Table 4.
AKS truth table
OPT2/AKS
Description
VSS
Disabled
VDD
Global locking AKS on all available keys
Table 5.
Low power (LP) mode truth table
OPT3/LP
Description
VSS
Free running mode
VDD
100ms sleep duration
Table 6.
Max On-Duration (MOD) truth table
OPT4/MOD_0
OPT5/MOD_1
Description
VSS
VSS
Infinite
VSS
VDD
60s
VDD
VSS
20s
VDD
VDD
10s



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