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PDF STM8T143 Data sheet ( Hoja de datos )
| Número de pieza | STM8T143 | |
| Descripción | Single-channel capacitive sensor | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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STM8T143
Single-channel capacitive sensor for touch and proximity detection
SO8
(narrow)
UFDFPN8
(2 x 3 mm)
Features
• Touch and short range proximity detection
• Internal sampling capacitor
• On-chip integrated voltage regulator
• Automatic electrode tuning (AET)
• Electrode parasitic capacitance compensation
(EPCC)
• Dynamic calibration (DYCAL™)
• Environment control system (ECS)
• User programmable options include:
• Configurable output modes
• Configurable sensitivity levels
• Data streaming mode
• Low power management
• Operating supply voltage: 3 V to 5.5 V
• Supported interface:
– Individual key state output
– Single wire data interface
• Operating temperature: -40 to +85 °C
• ECOPACK® 8-pin SO and 8-pin UFDFPN
packages
Datasheet - production data
Applications
• Ear-face proximity detection for smart phone
devices
• Companion device for navigation
joystick/optical track pad
• User hand detection for Nomad equipment
(tablet PC)
• Ear-head detection for MP3/walkman ear buds
and Bluetooth headsets
• On/off touch sensing button such as GPS
system home button
• User hands detection for mouse/keyboards
• Wall switch backlight activation on user
approach and light controls on user touch
October 2013
This is information on a product in full production.
DocID18315 Rev 6
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www.st.com
1 page  
STM8T143
List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
Table 11.
Table 12.
Table 13.
Table 14.
Table 15.
Table 16.
Table 17.
Table 18.
Table 19.
Table 20.
Table 21.
Table 22.
Table 23.
Table 24.
Table 25.
Table 26.
Table 27.
Table 28.
Table 29.
Table 30.
Table 31.
STM8T143 pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Option bytes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Option byte description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Pin 1 configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Pin 8 configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Data streaming frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Voltage characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Current characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Thermal characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Average current consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
OUT/TOUT/DATA streaming pin characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
POUT/TOUT pin characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
CTRL pin characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Regulator and reference voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
General capacitive sensing characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Internal CS value. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Implemented EPCC values (pF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
External sensing component characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Data streaming timing characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
EMS data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
EMI data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
ESD absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Electrical sensitivities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
SO8-lead plastic small outline - package mechanical data. . . . . . . . . . . . . . . . . . . . . . . . . 48
UFDFPN8-lead ultra thin fine pitch dual flat - package mechanical data . . . . . . . . . . . . . . 50
Thermal characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Option byte values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Device identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
DocID18315 Rev 6
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STM8T143
4 STM8T ProxSense technology
STM8T ProxSense technology
4.1 Capacitive sensing overview
A capacitance exists between any reference point and ground as long as they are
electrically isolated. If this reference point is a sensing electrode, it can help to think of it as
a capacitor. The positive electrode of the capacitor is the sensing electrode, and the
negative electrode is formed by the surrounding area (virtual ground reference in Figure 4).
Figure 4. Coupling with hand increases the capacitance of the sensing electrode
Sensing electrode
CX CT
Lower capacitance
Higher capacitance
When a conductive object is brought into proximity of the sensing electrode, coupling
appears between them, and the capacitance of the sensing electrode relative to ground
increases. For example, a human hand raises the capacitance of the sensing electrode as it
approaches it. Touching the dielectric panel that protects the electrode increases its
capacitance significantly.
4.2 Charge-transfer acquisition principle
To measure changes in the electrode capacitance, STM8T devices employ bursts of
charge-transfer cycles.
The measuring circuitry is connected to the CX pin. It is composed of a serial resistor RX
plus the sensing electrode itself of equivalent capacitance CX (see Figure 5). The sensing
electrode can be made of any electrically conductive material, such as copper on PCBs, or
transparent conductive material like Indium Tin Oxide (ITO) deposited on glass or Plexiglas.
The dielectric panel usually provides a high degree of isolation to prevent electrostatic
discharge (ESD) from reaching the STM8T touch sensing controller. Connecting the serial
resistor (RX) to the CX pin improves ESD immunity even more.
DocID18315 Rev 6
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11 Page | ||
| Páginas | Total 65 Páginas | |
| PDF Descargar | [ Datasheet STM8T143.PDF ] | |
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