QST108 Datasheet, PDF (37/38 Pages) STMicroelectronics – Capacitive touch sensor device 8 keys with individual key state outputs or I2C interface

QST108
8
Revision history
Revision history
Table 31. Document revision history
Date
Revision
Changes
8-Jun-2007
1
Initial release.
15-Jun-2007
2
Datasheet status changed to Preliminary Data.
26-Sep-2007
Removed Beeper function.
Changed LED output pins to GPO pins.
Updated pin names and functions in Section 2: Pin description on
page 5.
Added Figure 2: QTouch™ measuring circuitry on page 7.
Changed order of chapters in Section 3 for better comprehension.
Removed Simplified independent output mode from Section 4:
Device operating modes on page 11. Independent output mode
renamed Stand-alone mode.
Added Section 4.2: Reset and power-up on page 11.
Removed Power supply option chapter from Section 4.4.2: Option
descriptions on page 14.
3
Updated Table 6: Max On-Duration (MOD) truth table on page 14
and Table 7: Output mode (OM) truth table on page 15.
Updated Figure 3: Stand-alone mode typical schematic on page 13
and Figure 4: I2C mode typical schematic on page 16.
Updated Table 9: I²C address versus option resistor on page 17.
Added Figure 5: Optional LED schematic on page 18.
Updated Section 4.5: I2C mode on page 15.
Added Section 5.2.3: Key balance on page 24.
Updated Section 6.4: Supply current characteristics on page 29.
Added Section 6.5: Capacitive sensing characteristics on page 30.
and Section 6.7: RESET pin on page 34.
Updated Table 29: I²C characteristics on page 35.
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