Capacitive Sensor Control IC Series Capacitive Sensor Switch Control IC BU21051FS No.09048EBT05 ●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 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 RATING SYMBOL MIN MAX AVDD -0.3 7.0 DVDD -0.3 7.0 VAIN -0.3 AVDD + 0.3 VDIN -0.3 DVDD + 0.3 Storage temperature range Tstg -55 125 Power dissipation Pd Applied voltage Input voltage UNIT V V ℃ 500 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 www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. SYMBOL RATING MIN TYP MAX UNIT AVDD 4.5 5.0 5.5 V DVDD 4.5 5.0 5.5 V Topr -40 25 85 ℃ 1/6 2009.04 - Rev.B Technical Note 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 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 VOL GND - DVDD x 0.2 V Output“L”voltage IIZ -1 - 1 μA Input leakage current IOZ -1 - 1 μA Output leakage current IST - - 2 μA Standby current IDD - 500 - uA IOH = -2[mA]. Overshoot is excluded. Shutdown (SDN=“L”) ●A/D Converter PARAMETER SYMBOL Resolution RATING MIN TYP MAX UNIT - 10 - bit Analog Input voltage VAIN GND - AVDD V Change clock frequency fadck 0.2 - 1.0 MHz ftim - 13 - - - GND + 0.07 Change time Zero scale voltage Full scale voltage Condition μsec fadck = 1[MHz] V AVDD - 0.07 - - V Differential non line accurate DNL - - ±3 LSB Integrate non line accurate INL - - ±3 LSB ●CR Oscillator characteristic PARAMETER Oscillation Frequency SYMBOL fcr www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. RATING MIN TYP MAX 0.9 1.6 2.5 2/6 UNIT Condition MHz 2009.04 - Rev.B Technical Note BU21051FS GAIN[1] GAIN[0] FILTER PO1 PO2 SDN TST AVDD DVDD GND SREF SIN1 N.C. SIN2 THON THOFF ●Block Diagram, Pin configuration ●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. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 3/6 2009.04 - Rev.B Technical Note BU21051FS ●Pin Description Pin No 1 Name I/O Function Supply I/O 1 referen Reset level※ Pad ce Notes DVDD Power Digital part Power supply Digital part Power supply 2 GND Ground Ground 3 SREF AIn 4 SIN1 AIn 5 N.C. - 6 SIN2 AIn 7 THON AIn 8 THOFF AIn 9 AVDD 10 TST - - Standard capacitor input - AVDD “Hi-Z” ③ Sensor input1 - AVDD “Hi-Z” ③ No connect - - - - Sensor input 2 - AVDD “Hi-Z” ③ - AVDD “Hi-Z” ③ - AVDD “Hi-Z” ③ - - ① Sensor ON threshold voltage input Sensor OFF threshold voltage input Power Analog part Power supply In - Test input Usually tide to “L” DVDD DVDD 11 SDN In Shutdown input “H” : state of operation “L” : halt condition 12 PO2 Out Switch output 2 Sensor pin2 On → “L”, Off → “Hi-Z” DVDD “Hi-Z” ② 13 PO1 Out Switch output 1 Sensor pin1 On → “L”, Off → “Hi-Z” DVDD “Hi-Z” ② 14 FILTER In Filter selection 15 GAIN[0] In “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 Gain level selection 16 GAIN[1] ※*1 Initial State In ① DVDD ① DVDD ① DVDD ① Gain ① When internal organs power-on reset is effective ② When SDN = “L” ●I/O Circuit ①CMOS input ②CMOS 3state output I CIN ③CMOS 3state output with analog switch PAD AIN PAD PAD ASW OEN 【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. 4/6 2009.04 - Rev.B Technical Note BU21051FS 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 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 Technical Note BU21051FS ●Ordering number B U 2 Part No 1 0 5 1 F Part No S - Package FS：SSOP-A16 E 2 Packaging and forming specification E2：Embossed tape and reel SSOP-A16 <Tape and Reel information> 6.6 ± 0.2 (MAX 6.95 include BURR) Tape Embossed carrier tape Quantity 2500pcs 9 Direction of feed 0.3MIN 4.4±0.2 6.2±0.3 16 15 14 13 12 11 10 1 2 3 4 5 6 7 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 ) 8 0.11 1.5±0.1 0.15 ± 0.1 0.8 0.1 0.36 ± 0.1 1pin Reel (Unit : mm) www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 6/6 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. The content specified herein is for the purpose of introducing ROHM's products (hereinafter "Products"). If you wish to use any such Product, please be sure to refer to the specifications, which can be obtained from ROHM upon request. Examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the Products. The peripheral conditions must be taken into account when designing circuits for mass production. Great care was taken in ensuring the accuracy of the information specified in this document. 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