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PDF QST104 Data sheet ( Hoja de datos )
| Número de pieza | QST104 | |
| Descripción | Capacitive touch sensor device 4 keys | |
| Fabricantes | STMicroelectronics | |
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QST104
Capacitive touch sensor device
4 keys with individual key state outputs or I2C interface
Features
■ Patented charge-transfer design
■ Up to 4 independent QTouch™ keys supported
■ Individual key state outputs or I2C interface
■ Fully “debounced” results
■ Patented AKS™ Adjacent Key Suppression
■ Self-calibration and auto drift compensation
■ Spread-spectrum bursts to reduce EMI
■ Up to 13 general-purpose outputs
■ ECOPACK® (RoHS compliant) package
Applications
This device specifically targets human interfaces
and front panels for a wide range of applications
such as PC peripherals, home entertainment
systems, gaming devices, lighting and appliance
controls, remote controls, etc.
QST devices are designed to replace mechanical
switching/control devices and the reduced
number of moving parts in the end product
provides the following advantages:
■ Lower customer service costs
■ Reduced manufacturing costs
■ Increased product lifetime
LQFP32 (7x7 mm)
Description
The QST104 is the ideal solution for the design of
capacitive touch sensing user interfaces.
Touch-sensitive controls are increasingly
replacing electromechanical switches in home
appliances, consumer and mobile electronics,
and in computers and peripherals. Capacitive
touch controls allow designers to create stylish,
functional, and economical designs which are
highly valued by consumers, often at lower cost
than the electromechanical solutions they
replace.
The QST104 QTouch™ sensor IC is a pure digital
solution based on Quantum's patented charge-
transfer (QProx™) capacitive technology.
QTouch™ and QProx™ are trademarks of the
Quantum Research Group.
Table 1. Device summary
Feature
Order code
QST104KT6
Operating supply voltage 2.4 to 5.5 V
Supported interfaces
Individual key state outputs
or I2C Interface
Operating temperature -40° to +85° C
Package
LQFP32 (7x7 mm)
February 2008
Rev 2
1/45
www.st.com
1
1 page  
QST104
2 Pin description
Figure 1. 32-pin package pinout
wwPwi.nDadteasShceriept4tiUo.cnom
GPO4/KOUT4/OPT4 (HS)
GPO5/OPT5 (HS)
IRQ/OPT6 (HS)
I2C_SDA1) (HS)
I2C_SCL1) (HS)
RESET
NC
VDD_1
32 31 30 29 28 27 26 25
1 24
2 23
3 22
4 QST104KT6
5
21
20
6 19
7 18
8 17
9 10 11 12 13 14 15 16
GPO8
GPO7
GPO6
SNSK_SCK4
SNS_SCK4
SNSK_SCK3
SNS_SCK3
SNSK_SCK2
(HS) 20 mA high sink capability (on N-buffer only)
1. An external pull-up is required on these pins.
Table 2.
Pin
Device pin description
Pin name
Type (1) Stand-alone mode function
I2C mode function
If unused
1
GPO4/OPT4/KOUT4 (2)
PP (HS)
Key 4 output / BCD output 4
and MOD_0 option resistor
2 GPO5/OPT5 (2)
PP (HS) MOD_1 option resistor
3 OPT6/IRQ (2)
4 I2C_SDA(3)
5 I2C_SCL(3)
PP/OD
(HS)
OM_0 option resistor
TOD
(HS)
TOD
(HS)
General-purpose output 4
and I²C address bit 2
option resistor
Option
resistor
Open or
General-purpose output 5 option
resistor
Interrupt line (active low)
Open or
option
resistor
I2C serial data
Open
I2C serial clock
Open
5/45
5 Page 
QST104
4 Device operating modes
Devicewowpwe.rDaatitnagShmeeot4dUe.csom
4.1 Reset and power-up
At power-up, the device configures itself according to the pull-up or pull-down option
resistors present on pins OPT1 to OPT6. The device start-up and configuration may take up
to tSetup.
When the power is established, it is possible to force a new device configuration by applying
a negative pulse on the RESET pin.
The RESET pin is a bidirectional pin with an internal pull-up. The line is forced low when the
device resets itself (through an I²C command, for example).
A 10nF capacitor is recommended on the RESET pin to ensure reliable start-up and noise
immunity.
4.2 Burst operation
The device operates in “Burst” mode. Each key touch is acquired using a burst of charge-
transfer sensing pulses whose count varies depending on the value of the sense capacitor
CS and the load capacitance CX.
In Low Power mode, the device sleeps in an ultra-low current state between bursts to
conserve power.
4.3 Low power mode
In order to reduce the device power consumption, the QST family include scalable low
power modes.
● Standard low power mode
When the device is in standard low power mode, a window with very low power
consumption is inserted between the acquisition of the last active key and the following
acquisition of the first active key.
This window duration is programmable as the 'sleep duration time'.
Note that the sleep window insertion is cancelled in the following conditions:
– If a change is detected on a key, in order to speed up the DI process, the sleep
window insertion is skipped until the end of the DI process.
– In I2C mode, when a key change is actually detected and reported with a negative
pulse on the IRQ pin. In this case, the low power mode is disabled until a
command is received from the host.
– Inside an I2C command, between the Write and the Read I2C frames, the sleep
period is skipped.
● Free run in detect
The behavior in this mode is the same as in the standard low power mode except that
the sleep window insertion is always skipped if any of the active keys is detected as
touched.
This is useful to improve the wheel response time.
11/45
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet QST104.PDF ] | |
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