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Capacitive Sensor Control IC Series
Capacitive Sensor Switch Control IC
BU21050FS
Description BU21050FS are the capacitive sensor controller with 8ch respectively. The IC has the port interface and easy to replace the point of switch to this controller. Features 1) Port output interface 2) Few software control 3) 4bit Binary outputs or 8GPIO outputs 4) 5V power supply voltage available 5) Integrated 10bit AD converter, clock and reset 6) Package SSOP-A32 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 -55 760 MAX 7.0 7.0 AVDD + 0.3 DVDD + 0.3 125
No.09048EBT01
UNIT V V mW
Ambient temperature reduces a permission loss by 7.6mW 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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1/7
2009.04 - Rev.B
BU21050FS
Electrical characteristics(Especially, Topr=25 and AVDD=DVDD=0 as long as it doesn't specify it.) Rating Item 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 Operation current VIHIO VILIO VOL IIZ IOZ IST IDD DVDD x 0.9 GND - 0.2 GND -1 550 DVDD + 0.2 DVDD x 0.1 DVDD DVDD x 0.2 1 1 2 V V V V A A A uA
Technical Note
Condition
VOHIO DVDD x 0.8
IOH = -2[mA].Overshoot is excluded. IOL = 2[mA].Undershoot 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 CR Oscillator characteristic RATING MIN 0.8 TYP 1.6 MAX 2.5 SYMBOL MIN GND 0.2 AVDD - 0.07 RATING TYP 10 13 MAX AVDD 2.0 GND + 0.07 3 3 UNIT bit V MHz sec V V LSB LSB Condition
VAIN fadck ftim
fadck = 1[MHz]
DNL INL
PARAMETER Frequency Oscillation
SYMBOL fcr
UNIT MHz
Condition
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2/7
2009.04 - Rev.B
BU21050FS
Technical Note
Block Diagram, Pin configuration
PO8 GAIN[1] GAIN[0]
INSEL AVDD
TST3
TST2
TST1
TST0
PO2
PO4
PO5
PO1
PO3
PO6
PO7
Sensor I/F CV Conversion Circuit This part selects target sensor and converts its capacitance to a voltage signal. Specifically, all eight 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 CVconversion circuit. This block eliminates these noises. Compare threshold CV converted to sensor data On / Off compared with a threshold, the switch converts the signal. Interface Selection By setting this block, output mode can be set to either 8-bit PIO mode or 4-bit binary mode. Calibration When the capacitance change do not exceed the threshold for a certain period, this block tarts-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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3/7
2009.04 - Rev.B
FILTER
THON THOFF
SIN3
GND
SIN1
SIN2
SIN5
SIN6
SDN DVDD
SIN4
SREF
SIN7
SIN8
IFSEL
BU21050FS
Pin Description Pin Name No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 SDN DVDD GND SREF SIN1 SIN2 SIN3 SIN4 SIN5 SIN6 SIN7 SIN8 THON THOFF AVDD FILTER
Technical Note
I/O In
Function Shutdown input
Note "H" : state of operation "L" halt condition Digital part Power supply -
Supply DVDD AVDD AVDD AVDD AVDD AVDD AVDD AVDD AVDD AVDD AVDD AVDD
Reset Level I/O Pad
Power Digital part Power supply Ground Ground AIn AIn AIn AIn AIn AIn Ain AIn AIn AIn Standard capacitor input Sensor input1 Sensor input 2 Sensor input 3 Sensor input 4 Sensor input 5 Sensor input 6 Sensor input 7 Sensor input 8
"Hi-Z" "Hi-Z" "Hi-Z" "Hi-Z" "Hi-Z" "Hi-Z" "Hi-Z" "Hi-Z" "Hi-Z" "Hi-Z" "Hi-Z"

Sensor ON threshold voltage input Sensor OFF threshold voltage AIn input Power Analog part Power supply In Filter selection
"H": Filter effect: strong "L": Filter effect: Weak "H" :ON : L-Active, OFF : Nch Open Drain "L": 4bit Binary Mode H-Active, L "H" : simultaneous push banned "L" : 8 outputs setting GAIN[1:0] = 00 : Strong GAIN[1:0] = 01 : Gain GAIN[1:0] = 10 : GAIN[1:0] = 11 : Week INSEL="L": Binary Mode 0000 = Button OFF 0001 = SIN1 ON 1000 = SIN8 ON Usually tide to "L" Usually tide to "L" Usually tide to "L" Usually tide to "L"
DVDD
17
IFSEL
In
Sensor output selection
DVDD
18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
INSEL GAIN[0] GAIN[1] PO8 PO7 PO6 PO5 PO4 PO3 PO2 PO1 TST0 TST1 TST2 TST3
In In In Out Out Out Out Out Out Out Out In In In In
simultaneous push selection
DVDD DVDD DVDD DVDD DVDD DVDD DVDD DVDD DVDD DVDD DVDD DVDD DVDD DVDD DVDD "Hi-Z"*2 "L"*3 "Hi-Z" "Hi-Z" "Hi-Z" "Hi-Z" "Hi-Z" "Hi-Z" "Hi-Z" "L" "L" "L" "L" "L" "L" "L"

Gain level selection sensor output8 sensor output7 sensor output6 sensor output5 sensor output4/BIN[3] sensor output3/BIN[2] sensor output2/BIN[1] sensor output1/BIN[0] digital part test input0 digital part test input1 digital part test input2 digital part test input3
When internal organs power-on reset is effective When SDN="L" 2 "Hi-Z" when PIO Mode 3 "L" when Binary Mode
*1 Initial State
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4/7
2009.04 - Rev.B
BU21050FS
I/O Circuit CMOS INPUT CMOS 3state output
Technical Note
CMOS 3state output with analog switch
I
PAD AIN ASW PAD
CIN
PAD
OEN
IFSEL: Output interface format IFSEL H L INSEL = H : 8GPIOs output mode Initial status PO[8:1] = Hi-Z INSEL = L : 4bit Binary output mode Initial Status PO[4:1] = L Button PO[4:1] Button OFF 0000 SIN1 0001 SIN2 0010 SIN3 0011 SIN4 0100 SIN5 0101 SIN6 0110 SIN7 0111 SIN8 1000 Only the first sensor input was effective in terms of button ON judgment when more than one input has occurred. Next judgment would be done after all the button is OFF. INSEL : Simultaneous push judgment control This setting is effective when IFSEL = "H" INSEL Function H L Simultaneous push banned Simultaneous push effective Mode 8ch PIO 4bit Binary Output format L-active, Nch Open Drain H-active, L
Note
Only the dominant button will outputwhen more than 2 buttons were pressed Every button that was pressed will output
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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5/7
2009.04 - Rev.B
BU21050FS
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 modeis 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 firstor set the two at one time. Since internal reset circuit is monitoring AVDD, wrong power ON sequencemay cause initialization error.
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6/7
2009.04 - Rev.B
BU21050FS
Ordering part number
Technical Note
B
Part No
U
2
Part No
1
0
5
0
F
S
-
E
2
Package FSSSOP-A32
Packaging and forming specification E2Embossed tape and reel
SSOP-A32

13.6 0.2 (MAX 13.95 include BURR)
32 17
Tape Quantity Direction of feed
0.3MIN
Embossed carrier tape 2000pcs E2
The direction is the 1pin of product is at the upper left when you hold
7.80.3
5.40.2
( reel on the left hand and you pull out the tape on the right hand
)
1
16
1.80.1
0.15 0.1
0.11
0.36 0.1 0.8
0.1
1pin
(Unit : mm)
Direction of feed
Reel
Order quantity needs to be multiple of the minimum quantity.
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7/7
2009.04 - Rev.B
Notice
Notes
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