Touch Sensor Controllers
Frequently Asked Questions
Touch Sensor Product Overview
Q. What are the target applications?
Q. Explain how the product works and the basic principles of touch technology?
Q. Does the TSC work in a moist or wet environments?
Q. What are the typical power/voltage requirements for the TSC- FMA1127?
Q. Can the FMA1127 TSC be used with non-conductive/non-magnetic metal surfaces?
Q. What are the number of touch channels and IC packaging options?
Q. What are the target applications?
The target applications include consumer and home appliances:
- Portable devices such as PDAs, cellular phones, MP3 players, remote controllers, and other integrated input devices
- Home appliances and consumer electronic products.
- LCD Touch screen with ITO, button, scroll, slider, multiple-touch and proximity sensing, touchpad, and other applications
- Mice for desktop PCs, workstations, and notebook PCs
Q. Explain how the product works and the basic principles of touch technology?
The FMA1127 Touch Sensor Controller (TSC) converts capacitance generated between the human body and conductive touch pads
to digital data without any analog signal processing. The TSC has a full digital architecture ideal for substituting conventional
buttons, scrolls, or slider functions for better look and feel and improved design.
It can generate touch output almost ten times faster than other touch sensor controllers, which gives more flexibility for error concealment. Its differential signal input architecture helps acquire higher immunity from common mode noises such as RF noise. It can also detect very small capacitive variation (0.03pF) so that it can cope with versatile design trials. In addition, its automatic impedance calibration enables it to maintain consistent sensitivity under many circumstances due to environmental changes such as temperature and humidity or production change including IC lot and PCB variations.
Q. Does the TSC work in a moist or wet environments?
Yes, the FMA1127 TSC technology is well suited for Waterproof applications such as home appliances e.g. Microwave ovens, ranges,
refrigerators, washers/dryers, etc.
Its differential signal input architecture makes it more immune to common mode noises such as RF noise. Due to differential inputs, no Ground is necessary. So it is immune to water or liquid (except for salt water)
Q. What are the typical power/voltage requirements for the TSC- FMA1127?
For 5V applications:
- I/O Pads: 5V
- Internal Core: 2.3~2.7V (Typical: 2.5V)
- On-chip regulator for internal core can be used.
For 3.3V applications:
- I/O Pads: 3.3V
- Internal Core: 2.3~2.7V (Typical: 2.5V)
- On-chip regulator for internal core can be used.
For 2.5V applications:
- I/O Pads: 2.5V
- Internal Core: 2.5V
- On-chip regulator for internal core should be turned off.
Q. Can the FMA1127 TSC be used with non-conductive/non-magnetic metal surfaces?
No but in certain cases, the FMA1127 is able to convert capacitance applied to Input to Time delay. The minimum capacitance
to be detected is about 0.078pF. Therefore, as far as any input can generate more than 0.78pF of capacitance, it can be used
with the touch sensor controller.
Q. What are the number of touch channels and IC packaging options?
QFN, SOP package options and die options are available. Below is the current list.
QFN, SOP package options and die options
