FMA1127 Datasheet, PDF (1/2 Pages) Fujitsu Component Limited. – Touch Sensor Controller

FMA1127
Touch Sensor Controller
Fujitsu
FMA1127
Principle of Touch Detection
Touch Pad
Zin
Impendance
Change
Zref
Detection
Touch Pad System Model
Finger
Contact
Detected
Zin
Zref
Touch
Detected
Impedance Status
Description
The FMA1127 is a low-power, compact, flexible touch sensor
controller that converts capacitance generated between the human
body and a conductive touch pad to digital data without any
analog signal processing. It includes touch sensor technology that
compares reference and sensor input impedances to detect touch,
all in digital domain.
Its programmability increases design flexibility and gives better
performance and stability for a broad range of applications. The
FMA1127’s Automatic Impedance Calibration (AIC™) function
can be easily configured to support different sensitivities for
individual channels independently as well as to change values of
parameters such as calibration intervals. AIC may also be
temporarily paused and resumed by a host MCU.
Features
• Patented full-digital architecture
• Supports 12 input channels (40QFN and 30SSOP) or 9 input
channels (32QFN and 24SSOP) or 6 input channels
(24QFN and 20SSOP)
• Programmable registers to characterize applications
• I2C interface with the host MCU
• Configurable Automatic Impedance Calibration (AIC™ )
• Two types of interrupts (GINT for general purpose and
TINT for touch detection)
Among the many features of the FMA1127 touch sensor
controller, is the Adjacent Pattern Interference Suppression
(APIS™) which acts as a filter to eliminate adjacent key or
pattern interference. The FMA1127 also gives touch-strength
output in addition to touch on/off output. There are a number of
general-purpose DIOs depending on the package type that can be
configured and programmed to meet customers’specific needs. This
gives customers greater flexibility and value.
The FMA1127 comes in various package types to support different
numbers of input channels and DIOs.
The FMA1127 touch sensor controller is developed and owned by
ATLab Inc., South Korea, and is distributed by Fujitsu
Microelectronics America, Inc.
• 8-bit resolution of touch strength data (256 steps)
• Three different modes for Adjacent Pattern Interference
Suppression (APIS™)
• Configurable DIO pins as direct touch outputs, extended
GPIOs, or external interrupt inputs.
• Beep generation for tactile feeling
• Idle and Sleep modes for power saving
• De-bounced touch outputs