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PDF BU21051FS Data sheet ( Hoja de datos )
| Número de pieza | BU21051FS | |
| Descripción | Capacitive Sensor Switch Control IC | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Capacitive Sensor Control IC Series
Capacitive Sensor Switch
Control IC
BU21051FS
●Description
BU21051FS are the capacitive sensor controller with 2ch respectively.
The IC has the port interface and easy to replace the point of switch to this controller.
●Features
1) Port output interface
www.Data2Sh) eeFte4wU.csoofmtware control
3) 2ch GPIO outputs
4) 5V power supply voltage available
5) Integrated 10bit AD converter, clock and reset
6) Package SSOP-A16
●Applications
It is possible to use it widely as a switch such as home electric appliance.
●Absolute Maximum Ratings (Ta=25℃)
PARAMETER
SYMBOL
RATING
MIN
MAX
Applied voltage
AVDD
DVDD
-0.3
-0.3
7.0
7.0
Input voltage
VAIN
VDIN
-0.3
-0.3
AVDD + 0.3
DVDD + 0.3
Storage temperature range
Tstg
-55
125
Power dissipation
Pd
500
Ambient temperature reduces a permission loss by 5mW per case more than 25 degrees Celsius, 1 degree Celsius
●Recommended Operating conditions
PARAMETER
SYMBOL
Applied voltage
Operating temperature range
AVDD
DVDD
Topr
MIN
4.5
4.5
-40
RATING
TYP
5.0
5.0
25
MAX
5.5
5.5
85
No.09048EBT05
UNIT
V
V
℃
mW
UNIT
V
V
℃
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
1/6
2009.04 - Rev.B
1 page  
BU21051FS
Technical Note
【Filter selection】
The noise filter effect can be selected If “Strong” is selected, noise will get down, but the reaction time will be longer.
Sensor ON threshold
FILTER =”L”: filter effect → under
delay time → small
FILTER =”L”: filter effect → strong
delay time → big
Switch detect time
●Setting method
www.Da1ta)PShleeaeste4Ufo.crothme first time in a minimum gain.
2)THOFF = 0V, and, THON 1/2VDD voltage as a guideline for whether or not to switch ON, and gain selection to please the rough.
Note: ON gain to a minimum, you gain more precision amended to increase the impact too, so please take note.
●Operation Mode
This IC has several modes, called detection mode, calibration mode, and shut-down mode. Each mode
is described as follow
【Detection Mode】
This is normal operation mode of this IC. In this mode, IC detects the sensor capacitance continually.
【Calibration Mode】
Under detection mode when no operation has been detected for sometime, Sensor offset calibration will be done.
And the interval between each calibration is fixed
Detection mode and Calibration mode are switched automatically.
【Shutdown Mode】
When SDN pin is set to “L”, IC will be shut-down and all internal circuits will stop working.
IC will work again when SDN pin is set to “H”.
●Power Supply ON Sequence
This IC has two power input pins AVDD and DVDD. Power ON sequence must be whether set DVDD first
or set the two at one time. Since internal reset circuit is monitoring AVDD, wrong power ON sequence
may cause initialization error.
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
5/6
2009.04 - Rev.B
5 Page | ||
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