Capacitive Sensor Control IC Series Capacitive Sensor Switch Control IC No.09048EBT01 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 RATING SYMBOL MIN MAX AVDD -0.3 7.0 DVDD -0.3 7.0 UNIT V VAIN -0.3 AVDD + 0.3 VDIN -0.3 DVDD + 0.3 Storage temperature range Tstg -55 125 Power dissipation Pd Input voltage V ℃ 760 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 www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. SYMBOL RATING UNIT MIN TYP MAX AVDD 4.5 5.0 5.5 V DVDD 4.5 5.0 5.5 V Topr -40 25 85 ℃ 1/7 2009.04 - Rev.B Technical Note 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 Condition DC characteristics Input“H”voltage VIHIO DVDD x 0.9 - DVDD + 0.2 V Input“L”voltage VILIO GND – 0.2 - DVDD x 0.1 V Output“H”voltage VOHIO DVDD x 0.8 - DVDD V IOH = -2[mA].Overshoot is excluded. - DVDD x 0.2 V IOL = 2[mA].Undershoot is excluded. Output“L”voltage VOL GND Input leakage current IIZ -1 - 1 μA Output leakage current IOZ - - 1 μA Standby current IST - - 2 μA Operation current IDD - 550 - uA 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 SYMBOL VAIN fadck ftim DNL INL MIN GND 0.2 AVDD - 0.07 - RATING TYP 10 13 - MAX AVDD 2.0 GND + 0.07 ±3 ±3 UNIT bit V MHz μsec V V LSB LSB Condition fadck = 1[MHz] ●CR Oscillator characteristic PARAMETER Frequency Oscillation www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. SYMBOL fcr RATING MIN TYP MAX 0.8 1.6 2.5 2/7 UNIT Condition MHz 2009.04 - Rev.B Technical Note BU21050FS GAIN[0] INSEL IFSEL FILTER SIN7 AVDD PO6 PO7 SIN6 PO8 GAIN[1] PO5 SIN5 SIN8 PO4 SIN4 THON THOFF PO2 PO1 PO3 TST0 SIN1 SIN3 TST1 GND SREF SIN2 TST2 SDN DVDD TST3 ●Block Diagram, Pin configuration ・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. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 3/7 2009.04 - Rev.B Technical Note BU21050FS ●Pin Description Pin Name No. I/O 1 SDN In 2 DVDD 3 GND 4 SREF AIn 5 SIN1 6 7 Function Shutdown input Power Digital part Power supply Note “H” : state of operation “L” halt condition Digital part Power supply Ground Ground Supply Reset Level I/O Pad DVDD ① - - - Standard capacitor input - AVDD “Hi-Z” ③ AIn Sensor input1 - AVDD “Hi-Z” ③ SIN2 AIn Sensor input 2 - AVDD “Hi-Z” ③ SIN3 AIn Sensor input 3 - AVDD “Hi-Z” ③ 8 SIN4 AIn Sensor input 4 - AVDD “Hi-Z” ③ 9 SIN5 AIn Sensor input 5 - AVDD “Hi-Z” ③ 10 SIN6 Ain Sensor input 6 - AVDD “Hi-Z” ③ 11 SIN7 AIn Sensor input 7 - AVDD “Hi-Z” ③ 12 SIN8 AIn Sensor input 8 - AVDD “Hi-Z” ③ 13 THON - AVDD “Hi-Z” ③ 14 THOFF AVDD “Hi-Z” ③ 15 AVDD 16 FILTER In Filter selection 17 IFSEL In Sensor output selection 18 INSEL In simultaneous push selection 19 GAIN[0] In 20 GAIN[1] In 21 PO8 Out sensor output8 22 PO7 Out sensor output7 - DVDD “Hi-Z” “L” ② 23 PO6 Out sensor output6 - DVDD “Hi-Z” “L” ② 24 PO5 Out sensor output5 - DVDD “Hi-Z” “L” ② 25 PO4 Out sensor output4/BIN[3] DVDD “Hi-Z” “L” ② 26 PO3 Out sensor output3/BIN[2] DVDD “Hi-Z” “L” ② 27 PO2 Out sensor output2/BIN[1] DVDD “Hi-Z” “L” ② 28 PO1 Out sensor output1/BIN[0] DVDD “Hi-Z” “L” ② 29 TST0 In digital part test input0 Usually tide to “L” DVDD ① 30 TST1 In digital part test input1 Usually tide to “L” DVDD ① 31 TST2 In digital part test input2 Usually tide to “L” DVDD ① 32 TST3 In digital part test input3 Usually tide to “L” DVDD ① Sensor ON threshold voltage input Sensor OFF threshold voltage AIn input Power Analog part Power supply AIn Gain level 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 DVDD ① DVDD ① DVDD ① DVDD ① DVDD ① DVDD “Hi-Z”*2 “L”*3 ② ※*1 Initial State ①When internal organs power-on reset is effective ②When SDN=”L” ※2 “Hi-Z” when PIO Mode ※3 “L” when Binary Mode www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 4/7 2009.04 - Rev.B Technical Note BU21050FS ●I/O Circuit ①CMOS INPUT ②CMOS 3state output I CIN ③CMOS 3state output with analog switch PAD AIN PAD PAD ASW OEN 【IFSEL: Output interface format】 IFSEL H L Mode 8ch PIO 4bit Binary Output format L-active, Nch Open Drain H-active, 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 Note H Simultaneous push banned Only the dominant button will outputwhen more than 2 buttons were pressed L Simultaneous push effective Every button that was pressed will output 【THON: Button OFF→ON threshold value judge】 【THOFF: Button ON→OFF 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) www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 5/7 2009.04 - Rev.B Technical Note BU21050FS Sensor value 【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 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. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 6/7 2009.04 - Rev.B Technical Note BU21050FS ●Ordering part number B U 2 Part No 1 0 5 0 Part No F S - Package FS：SSOP-A32 E 2 Packaging and forming specification E2：Embossed tape and reel SSOP-A32 <Tape and Reel information> 13.6 ± 0.2 (MAX 13.95 include BURR) 17 Embossed carrier tape Quantity 2000pcs Direction of feed 0.3MIN 5.4±0.2 7.8±0.3 32 Tape 1 E2 The direction is the 1pin of product is at the upper left when you hold ( reel on the left hand and you pull out the tape on the right hand ) 16 0.11 1.8±0.1 0.15 ± 0.1 0.36 ± 0.1 0.1 0.8 1pin Reel (Unit : mm) www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 7/7 Direction of feed ∗ Order quantity needs to be multiple of the minimum quantity. 2009.04 - Rev.B Notice Notes No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. The content specified herein is subject to change for improvement without notice. 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