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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.
No.09048EBT05
Features 1) Port output interface 2) Few software 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 Applied voltage Input voltage Storage temperature range Power dissipation SYMBOL AVDD DVDD VAIN VDIN Tstg Pd RATING MIN -0.3 -0.3 -0.3 -0.3 -55 500 MAX 7.0 7.0 AVDD + 0.3 DVDD + 0.3 125 UNIT V V mW
Ambient temperature reduces a permission loss by 5mW per case more than 25 degrees Celsius, 1 degree Celsius
Recommended Operating conditions PARAMETER Applied voltage Operating temperature range SYMBOL AVDD DVDD Topr RATING MIN 4.5 4.5 -40 TYP 5.0 5.0 25 MAX 5.5 5.5 85 UNIT V V
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1/6
2009.04 - Rev.B
BU21051FS
Electrical characteristics(Especially, Topr=25 and AVDD=DVDD=0 as long as it doesn't specify it.) RATING PARAMETER SYMBOL UNIT MIN TYP MAX DC characteristics Input"H"voltage Input"L"voltage Output"H"voltage Output"L"voltage Input leakage current Output leakage current Standby current VIHIO VILIO VOL IIZ IOZ IST IDD DVDD x 0.9 GND - 0.2 GND -1 -1 500 DVDD + 0.2 DVDD x 0.1 DVDD x 0.2 1 1 2 V V V A A A uA
Technical Note
Condition
IOH = -2[mA]. Overshoot is excluded.
Shutdown (SDN="L")
A/D Converter PARAMETER Resolution Analog Input voltage Change clock frequency Change time Zero scale voltage Full scale voltage Differential non line accurate Integrate non line accurate DNL INL VAIN fadck ftim SYMBOL RATING MIN GND 0.2 AVDD - 0.07 TYP 10 13 MAX AVDD 1.0 GND + 0.07 3 3 UNIT bit V MHz sec fadck = 1[MHz] V V LSB LSB Condition
CR Oscillator characteristic PARAMETER Oscillation Frequency SYMBOL fcr RATING MIN 0.9 TYP 1.6 MAX 2.5 UNIT MHz Condition
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2/6
2009.04 - Rev.B
BU21051FS
Block Diagram, Pin configuration
GAIN[1] GAIN[0] FILTER SDN PO1 PO2 TST AVDD THOFF
Technical Note
DVDD
SREF
SIN1
N.C.
SIN2
Sensor I/F CV Conversion Circuit: This part selects target sensor and converts its capacitance to a voltage signal. Specifically, alleight sensors are selected one-by-one and their capacity is compared to a common referencecapacity. Each difference value is converted to a certain voltage signal. AD Conversion The voltage signal derived from CV conversion is further converted to digital value by this block. Conversion Sequence Control This block controls the process of CV conversion and generates timing of selecting target sensors. Noise Filter The GND level difference between appliance and human body will cause noises to the CV conversion Compare threshold CV converted to sensor data On / Off compared with a threshold, the switch converts the signal. Calibration When the capacitance change do not exceed the threshold for a certain period, this blockstarts-up calibration process. Reset Generation This is internal reset circuit. Reset is initialized by external SDN signal. Clock Generation Clock from internal RC oscillation circuit is used as system clock.
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THON
GND
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2009.04 - Rev.B
BU21051FS
Pin Description Pin No 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Name I/O Function Notes
Technical Note
Supply I/O 1 referen Reset level Pad ce AVDD AVDD AVDD AVDD AVDD DVDD DVDD DVDD DVDD DVDD DVDD Gain DVDD "Hi-Z" "Hi-Z" "Hi-Z" "Hi-Z" "Hi-Z" "Hi-Z" "Hi-Z"
DVDD Power Digital part Power supply Digital part Power supply GND SREF SIN1 N.C. SIN2 THON THOFF AVDD TST SDN PO2 PO1 FILTER GAIN[0] GAIN[1] Ground Ground AIn AIn AIn AIn AIn Standard capacitor input Sensor input1 No connect Sensor input 2 Sensor ON threshold voltage input Sensor OFF threshold voltage input Usually tide to "L" "H" : state of operation "L" : halt condition Sensor pin2 Sensor pin1 On "L", Off "Hi-Z" On "L", Off "Hi-Z"
Power Analog part Power supply In In Out Out In In Gain level selection In Test input Shutdown input Switch output 2 Switch output 1 Filter selection
"H": Filter effect: strong "L": Filter effect: Weak GAIN[1:0] = 00 : Strong GAIN[1:0] = 01 : GAIN[1:0] = 10 : GAIN[1:0] = 11 : Week
*1 Initial State
When internal organs power-on reset is effective When SDN = "L"
I/O Circuit CMOS input CMOS 3state output CMOS 3state output with analog switch
I
PAD AIN ASW PAD
CIN
PAD
OEN
THON: Button OFFON threshold value judge THOFF: Button ONOFF threshold value judge Setting the threshold value of electrostatic Sensor Switches. By applying voltages can be set. As an example, 1/2VDD applied to the entire range of the sensor output 1 / 2 to set the threshold value. In fact, the voltage setting resistance to the partial pressure is recommended to us. GAIN Selection Sensor gain can be set in 4 stages GAIN[1:0] = 00 (x92) GAIN[1:0] = 01 (x69) GAIN[1:0] = 10 (x46) GAIN[1:0] = 11 (x1)
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4/6
2009.04 - Rev.B
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 value
Sensor ON threshold
FILTER = "L": filter effect under delay time small
Switch detect time
FILTER ="L": filter effect strong delay time big
Setting method 1)Please for the 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.
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5/6
2009.04 - Rev.B
BU21051FS
Ordering number
Technical Note
B
Part No
U
2
Part No
1
0
5
1
F
S
-
E
2
Package FSSSOP-A16
Packaging and forming specification E2Embossed tape and reel
SSOP-A16
6.6 0.2 (MAX 6.95 include BURR)
16 15 14 13 12 11 10 9

Tape Quantity Embossed carrier tape 2500pcs E2
The direction is the 1pin of product is at the upper left when you hold
6.20.3
4.40.2
Direction of feed
0.3MIN
( reel on the left hand and you pull out the tape on the right hand
)
1
2
3
4
5
6
7
8
1.50.1
0.15 0.1
0.11
0.8
0.1
0.36 0.1
1pin
(Unit : mm)
Direction of feed
Reel
Order quantity needs to be multiple of the minimum quantity.
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6/6
2009.04 - Rev.B
Notice
Notes
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