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PDF BF6921A Data sheet ( Hoja de datos )
| Número de pieza | BF6921A | |
| Descripción | 8/16-Channel Capacitive TouchKey Controller | |
| Fabricantes | BYD Microelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de BF6921A (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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BYD Microelectronics Co., Ltd.
BF6921A
BF6921A Datasheet
8/16-Channel Capacitive TouchKey
Controller
Product Preview
Reversion 1.0
Date April 16, 2010
Datasheet
TS-COD-PD-0004 Rev. A/0
Page 1 of 36
1 page  
BYD Microelectronics Co., Ltd.
1. SPECIFICATION
1.1 Features
z Number of Keys
—From 1 to 8/16 keys
z LP(low power) Mode
— Variable low power mode: Idle Mode or Sleep Mode
z Versatile Interfaces Available
SPI
I2C:（standard mode or fast mode）
UART
z Selectable Key Mode
— Each key can operate in a mode individually
z Supply Voltage: 2.7~5.5V
z Wide IO Voltage Range: 1.65~5.5V
z Insensitive to Environment Variations
z Operation Mode
—Interrupt mode or query mode
z Key Sensitivity
— Individual sensitivity can be set by interface
z On-chip Automatic Calibration Logic
— Optional speed for self-calibration
z HBM ESD : ±2000V
z Package type: QFN24/QFN40/SOP30
1.2 Applications
z White Home Application
z Mobile/Portable Device
z Smart Phone
z Control Device
z Game Controller
z Remote Controller
z Computer & Peripheral
BF6921A
Datasheet
TS-COD-PD-0004 Rev. A/0
Page 5 of 36
5 Page 
BYD Microelectronics Co., Ltd.
BF6921A
Sleep Mode: SLEEP_MODE≠0 will make BF6921A enter the sleep mode. Any external interrupt signal will
wake it up.
The following figure shows the transition relationship of the three modes.
Figure 9 Work Modes Transition
5. INTERRUPT AND QUERY MODE
The TS device supports both interrupt mode and query mode. As explained above, DAV line is used to
generate interrupt signal, and every time DAV signal received, the host device may initiate data extraction via
I2C bus. When operated in the query mode, however, the TS device transmits most updated data whenever
the host device accesses TS device via I2C to extract data. In this query mode, the host could request for
touch-related information to the TS device at any time. The TS device can be configured as interrupt modes or
query mode by programming corresponding Register.
5.1 Interrupt Mode
In the interrupt mode, the TS device indicates the host device by sending DAV signal whenever there is
updated information to transmit. DAV line works as a interrupt signal. When an input event occurs, e.g.,
touch-on/leave-off state changing, the DAV line is pull down by the TS device to give out interrupt signal, which
implies that there is information to be transmitted in corresponding the input event. Once touch-on is detected,
the TS device continually asserts INTR signal at a regular interval until leave-off is detected. By extracting data
from the TS device at every instance the DAV line pull-down is detected, the host device can always obtain the
most updated information corresponding to user input.
In the default setting, DAV line is used as an active-low manner. This means that the INTR line remains ‘high’
until user input is applied to the TS device. But when the user input is detected and the TS device is prepared
to transmit more updated data to the host, it starts pulling down DAV signal. The DAV will not pull high until no
touch is ever detected.
Datasheet
TS-COD-PD-0004 Rev. A/0
Page 11 of 36
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet BF6921A.PDF ] | |
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