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PDF EKT8100A Data sheet ( Hoja de datos )
| Número de pieza | EKT8100A | |
| Descripción | Capacitive Touch Pad Controller | |
| Fabricantes | ELAN Microelectronics | |
| Logotipo |  |
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eKT8100A
Product
Specification
DOC. VERSION 1.3
ELAN MICROELECTRONICS CORP.
November 2006
1 page  
eKT8100A
Capacitive Touch Pad Controller
1 Introduction
The eKT8100A is a low-cost single chip solution for capacitive touch pad. It is an 8-bit
RISC microcontroller with Serial Peripheral Interface (SPI) and Universal Asynchronous
Receiver / Transmitter (UART).
The eKT8100A has three modes of application – First, it supports Full button mode,
which provides only virtual buttons information at the same time. Second, it supports
Single scroll bar mode, which provides scroll bar (S1) absolute position information
and virtual buttons information at the same time. Third, it supports Double scroll bar
mode, which provide 1st scroll bar (S1) absolute position information, 2nd scroll bar
(S2) absolute position information and virtual buttons information at the same time.
The customer can use these modes to develop their system control.
The capacitive touch pad sensor is covered with a plastic case. The typical thickness of
the plastic is 1.0mm ~ 1.5mm. It can also auto calibrate the parameters for a wide
range of capacitance on the touch pad sensor (10pF~50pF). In Full button mode, the
range of capacitance on the touch pad sensor (5pF~15pF). The system controller
converts finger position data to either scrolling data or button presses, depending on
finger location and human interface context.
2 Features
Operating voltage: 2.6V ~ 5.5V, Ripple < 100mVpp
Power-on reset time: Stable time for operating < 150ms, the touch pad will send
“Packet Hello” after initialization
Interface features: Serial Peripheral Interface (SPI) / Universal Asynchronous
Receiver Transmitter (UART)
Operating mode:
Mode
Normal
Idle
Sleep
Description
1. Finger on touch pad
2. Higher scan rate
1. Finger leaves touch pad
2. Lower scan rate
3. Scan rate in idle mode can be adjusted by changing the
external RC value.
No scan
Current
<1.5 mA
<200 µA
<20 µA
Application mode:
Mode 1 (Full button mode): maximum support for 18 virtual buttons
Mode 2 (Single scroll mode): one scroll bar + 6 virtual buttons
Mode 3 (Double scroll mode): two scroll bars + 8 virtual buttons
Product Specification (V1.3) 11.01. 2006
•1
5 Page 
/INT
TTr_Start_0
SCK
(From
Touchpad)
SDO_TX
Byte 1
TByte_Interval
Byte 2
TTr_Start_1
eKT8100A
Capacitive Touch Pad Controller
TByte_Interval
SDI_RX
Byte 1
Byte 2
/SS
Touchpad to Host
(Packet Hello: 4 Bytes)
(Packet ID # 6: 5 Bytes)
(Packet ID # 8: 5 Bytes)
(Packet ID # 2: 4 Bytes)
Host to Touchpad
(Packet ID # 3: 4 Bytes)
(Packet ID # 4: 4 Bytes)
Fig. 4-5 Data transmission and Receiving in SPI master mode
Although the eKT8100A is the SPI master, the host can send commands to the
touchpad controller by driving /SS pin to low. When the touchpad controller detects the
low state of the /SS pin, it will start to send the first clock to the host after “TTr_Start_1”
( ~ 250 µs). The interval time between each clock byte is “TByte_Interval” (~ 50 µs)
(see Fig. 4-5).
Product Specification (V1.3) 11.01. 2006
•7
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet EKT8100A.PDF ] | |
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