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PDF FMA1125DC Data sheet ( Hoja de datos )
| Número de pieza | FMA1125DC | |
| Descripción | Touch Sensor Controller | |
| Fabricantes | Fujitsu | |
| Logotipo |  |
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FMA1125DC
Touch Sensor Controller
Overview
The FMA1125DC 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.
Its programmability provides design flexibility, high performance
and stability for a broad range of applications. The
FMA1125DC’s AIC™ (Automatic Impedance Calibration)
function can be easily configured to support different sensitivities
for individual channels independently as well as to change values
of parameters such as the calibration interval. AICTM may also be
temporarily paused and resumed by a host MCU.
Among the many features of the FMA1125DC is APIS™
(Adjacent Pattern Interference Suppression). APIS is a filtering
function that eliminates adjacent key or pattern interference. The
FMA1125DC also gives touch-strength output in addition to
touch on/off output. There are a number of DIOs depending on
the package type that can be configured and programmed to meet
specific requirements, giving customers greater flexibility and
value.
The FMA1125DC comes with various package types to support
different numbers of input channels and DIOs.
The FMA1125DC touch sensor controller is developed and
owned by ATLab Inc., South Korea, and is distributed by
Fujitsu Microelectronics America, Inc.
Touch Pad
Zin Impedance
Change
Zref Detection
Zin < Zref
Touch Pad System Model
Touch Pad
Zin Impedance
Change
Zref Detection
Touch Pad System Model
Zin
Zref
Impedance Status
Ztouch
Zin
Zref
Touch
Detected
Impedance Status
Features
• Patented fully digital architecture
• Extremely low power consumption (100μA in active mode)
• Supports 8 input channels (24QFN, 24SSOP, 24SOP)
or 6 input channels (16QFN,16SOP)
• Programmable registers to characterize applications
• I2C interface with the host MCU
• Configurable Touch Input Channels as extended DIOs
• 6-bit resolution of LED dimming control via DIO pins
• Configurable AIC™ (Automatic Impedance Calibration)
• Two types of interrupts (GINT for general purpose and TINT
for touch detection)
• 8-bit resolution of touch strength data (256 steps)
• Three different modes for APIS™ (Adjacent Pattern
Interference Suppression)
• Configurable DIO pins as direct touch outputs, extended
GPIOs or external interrupt inputs
• Idle and Sleep modes for power saving
• De-bounced touch outputs
Applications
• Portable devices such as PDAs, cellular phones, MP3 players,
remote controllers, and other integrated input devices
• Home appliances and consumer electronic products
• Computer input devices such as mice and keyboards
Confidential
Free Datasheet http://www.datasheet-pdf.com/
1 page  
FMA1125DC
Operation Principles
Touch Detection
The FMA1125DC includes the Impedance Change Detection engine* within the device, which detects impedance differences between the
reference input and the sensor input.
Touch Pad
Touch Pad
Ztouch
Zin Impendance
Change
Zref Detection
Zin
Zref
Zin < Zref
Touch Pad System Model
Impedance Status
Figure 1: When a Pad is Not Touched.
Zin Impendance
Change
Zref Detection
Zin
Zref
Touch Pad System Model
Touch
Detected
Impedance Status
Figure 2: When a Pad is Touched.
As shown in Figure 1, if the pad is not touched, the impedance of the sensor input Zin should be kept less than the impedance of the
reference Zref. If the pad is touched, as shown in Figure 2, Zin is increased by Ztouch. When Ztouch, by touching, becomes greater than
the difference of Zin and Zref in the not touched state, i.e., if Zin in touched state becomes greater than Zref by a value higher than 0.1pF,
the ICD (Impedance Change Detection) engine within the chip generates the acknowledged output signal indicating it senses the touch.
1, if Zin – Zref > 0.1pF
IDC =
0, otherwise
Notice that a value of 0.1pF or higher is needed to maintain stable output against various noises. The sensor input impedance, Zin,
includes parasitic capacitance of the input line, tuning capacitance of the input pin and on-chip input impedance, while Zref includes on-
chip impedance, AIC control values and external tuning capacitance if necessary.
AIC™ (Automatic Impedance Calibration)
The AIC* function maintains consistent sensitivity against external environmental changes such as temperature, supply voltage/current,
humidity, and system-level variations. This helps users to develop their applications more conveniently by providing the actual impedance
value of each sensor input. For developers, a Tuning Viewer program is provided, which helps to optimize PCB design and to decide AIC
input parameters. More detailed information is available in the FMA1125DC Tuning Guide.
The ICD engine residing in the FMA1125DC controls reference impedance values for each sensor input pin by acquiring each input’s
impedance data. It periodically updates all reference values under the condition that all touch pads remain in no-touched status. This
auto-calibration function absorbs environmental changes and guarantees product stability.
APIS™ Touch Output
When touch pads are arranged too closely to each other, it is sometimes difficult to identify which pad is touched. APIS™ (Adjacent
Pattern Interference Suppression) is a filtering function that identifies which pads are intentionally touched. If APIS mode is not defined,
all touch data without APIS filtering are transmitted to the MCU. For example, if the application is a numeric keypad, the user can use
APIS mode 1 to get the strongest output and filter out all other weakly touched inputs. Without APIS, the host may have to do this
filtering function thus APIS reduces the burden of the host’s computing time.
*Proprietary technology of ATLab, Inc.
Confidential
Fujitsu Microelectronics America, Inc. 3
Free Datasheet http://www.datasheet-pdf.com/
5 Page 
FMA1125DC
FMA1125DC 24QFN Typical Application Circuit: Internal LDO
FMA1125DC
24QFN
Notes:
• The voltage range of VDDH can be from 2.5V to 5V.
• 2k¾ pull-up resistors are required for I2C communication.
• PA0 ~ PA7 can be configured as either touch input channels or DIO ports.
• ID selects I2C chip ID of the FMA1125DC. When ID is ‘0’, chip ID is 0x68. Otherwise, chip ID is 0x69.
• For LED dimming control through DIO ports, sink current circuit is mandatory as shown above.
• When PA ports are configured as DIO and used for LED dimming control, the circuit should be the same as DIO ports explained above.
Confidential
Fujitsu Microelectronics America, Inc. 9
Free Datasheet http://www.datasheet-pdf.com/
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet FMA1125DC.PDF ] | |
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