Capacitive Sensor Control IC Series Capacitive Sensor Switch Control IC No.09048EBT02 BU21010MUV ●Description BU21010MUV are the capacitive sensor controller with 8 channels respectively. Half of sensor ports are available to use to LED driver. Also gesture function can recognize the short touch, long touch and finger motion. ●Features 1) Gesture function 2) LED driver 3) 2 wire serial interface 4) Power supply = 2.5V to 3.3V, I/O power supply = 1.7V to 3.3V 5) Integrated 10bit AD converter, clock and reset 6) Package VQFN016V3030 ●Applications It is possible to use it widely as a switch such as a Mobile phone, Portable equipment, and Audiovisual apparatuses. ●Absolute Maximum Ratings (Ta=25℃) PARAMETER RATING SYMBOL MIN MAX AVDD -0.3 4.5 DVDD -0.3 4.5 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 ℃ 215 mW ●Recommended Operating conditions PARAMETER APPLIED VOLTAGE OPERATINGTEMPERATURE RANGE www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. SYMBOL RATING UNIT MIN TYP MAX AVDD 2.5 3.0 3.3 V DVDD 1.7 3.0 3.3 V Topr -40 25 85 ℃ 1/14 2009.04 - Rev.B Technical Note BU21010MUV ●Electrical characteristics（Especially, Topr=25℃ and AVDD=DVDD=0 as long as it doesn't specify it.） RATING PARAMETER SYMBOL UNIT Condition MIN TYP MAX H INPUT VOLTAGE DVDDx0.8 VIHIO - DVDD+0.3 V L INPUT VOLTAGE VILIO DVSS-0.3 - DVDDx0.2 V Output "H" voltage VOHIO DVDD-0.7 - DVDD V IOH=-2[mA]. Overshoot is excluded. VOLLED AVSS - 0.5 0.5 VOLTXD DVSS - V VOLINT DVSS - 0.5 IOL=8[mA]. Undershoot is excluded. LED output. IOL=3[mA]. Undershoot is DVDD > 2[V] excluded. SDA/TXD DVDD ≦ 2[V] application. IOL=2[mA]. Undershoot is excluded. INT application. Input leakage current IIZ -1 - 1 μA Off leakage current IOZ -1 - 1 μA Standby current IST - - 2 μA Shutdown (SDN＝”L”) Current of operation IDD - 300 - μA Output "L" voltage DVDDx0.3 ●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 AVSS 0.2 AVDD-0.07 - RATING TYP 10 77 - MAX AVDD 2.0 AVSS+0.07 ±3 ±3 MIN 0.4 RATING TYP 1.1 MAX 2.0 UNIT bit V MHz μsec V V LSB LSB Condition fadck = 1[MHz] ^ ●CR Oscillator characteristic PARAMETER SYMBOL Frequency Oscillation fcr www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 2/14 UNIT Condition MHz 2009.04 - Rev.B Technical Note BU21010MUV ●Block Diagram, Pin configuration SIN2 SIN3/ LED1 SIN4 DVDD SIN5/ LED2 AVDD SREF SIN[7:0] Sensor I/F CV translate circuit Data correction and making to format ADC SIN1/ LED0 SIN6 SCL Conversion sequence control Data register SIN7/ LED3 GND AVDD SIN0 DVDD SREF SDA INT GND SDN Power management Clock generation CR oscill ation INT Reset generation SCL SDN SDA host I/F ・Sensor I/F CV translate circuit This module selects between sensor inputs. The selection sequences between all 16 channels. ・AD Conversion The voltage into which CV is converted is converted into a digital value. Conversion is 10 bit and full scale corresponds to AVDD. ・Conversion sequence control Performs timing generation for the analogue circuitry and a sequencer circuit for selection of the sensor channel for conversion. ・Data correction and making to format This module provides the digital intelligence of the sensor. The block includes, amongst other things, scaling, adding offsets and input filtering for de-bouncing. Registers are formatted to simplify usage by the softwareapplication. The block implements auto-calibration to manage drift in temperature, process variation, voltage variation and aging effects. ・Data register This stores the results for the software application. Please refer to the register map for details. ・HOST I/F 2 wire serial interface. ・Power management The power management block provides smart power control. When the sensors are not in use, the Controller automatically transitions into a low-power mode. When a sensor is touched, then the device automatically wakes up and enters its normal operation. The chip drives an INT pin for alerting the controller device in this case. ・Reset generation The circuit is initialized by the external SDN pin. ・Clock generation The device has an internal oscillator. Provision is also made if the application would like to make use of an external clock input. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 3/14 2009.04 - Rev.B Technical Note BU21010MUV ●Pin Description Pin No. Name I/O 1 SDA In/Out 2 SCL In 3 INT Out 4 SDN In 5 SREF AIn Standard capacitor input 6 SIN0 AIn sensor input0 7 GND 8 Function SIN2 SIN4 Shutdown input SIN6 I/O Pad - DVDD "Hi-Z" ⑤ - DVDD - ② DVDD "L" ③ DVDD - ① - AVDD "Hi-Z" ④ - AVDD "Hi-Z" ④ - - - - AVDD "Hi-Z" ④ AVDD "Hi-Z" ④ AVDD "Hi-Z" ④ AVDD "Hi-Z" ④ AVDD "Hi-Z" ④ AVDD "Hi-Z" ④ AVDD "Hi-Z" ④ Ground Analog and digital ground AIn AIn AIn sensor input , LED drive select sensor input2 sensor input , LED drive select sensor input4 - 12 SIN5/LED2 AIn/Out sensor input 5 / LED control output 2 13 Reset Level "L" : Active mode "H" : Idle mode "L" : Halt condition "H" : state of operation Output of interrupt 10 SIN3/LED1 AIn/Out sensor input 3 / LED control output 1 11 Supply Reference Communication data sending and receiving Communication synchronous clock input SIN1/LED0 AIn/Out sensor input 1 / LED control output 0 9 Note sensor input , LED drive select sensor input6 - 14 SIN7/LED3 AIn/Out sensor input 7 / LED control output 3 sensor input , LED drive select 15 AVDD Power Digital part Power supply - AVDD - - 16 DVDD Power Analog part Power supply - DVDD - - ●I/O Circuit ①CMOS INPUT CIN ②CMOS Schmitt INPUT PAD ④CMOS 3stute OUTPUT with ANALOG-SW CIN ③CMOS OUTPUT PAD I PAD ⑤CMOS Schmitt INOUT ASW CIN AIN I PAD OE www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. I PAD OEN 4/14 2009.04 - Rev.B Technical Note BU21010MUV ●HOST I/F ・ 2 wire serial, BUS Slave mode only Slave Address = 5Eh Normal （Normal mode. 100kHz Transfer rate） Fs mode (Fast mode. 400kHz Transfer rate) also. Not adapting sequential read / write. 【Data format】 tSU;STO tHD;STA SDA tSU;DAT tHD;DAT SCL START Address Read ACK Data ACK Data ACK Standard mode MIN MAX 0 100 Parameter fSCL : SCL Clock Freq STOP High Speed mode MIN MAX 0 400 Unit kHz tHD;STA : START condition hold time 4.0 - 0.6 - μsec tLOW : SCL “L” 4.7 - 1.3 - μsec tHIGH : SCL “H” 4.0 - 0.6 - μsec tHD;DAT : Data hold time 0.1 3.45 0.1 0.9 μsec tSU;DAT : Data setup time 0.25 - 0.1 - μsec tSU;STO : START condition hold time tBUF : Free time of bus between STOP condition and START condition 4.0 - 0.6 - μsec 4.7 - 1.3 - μsec 【PROTOCOL】 ・Write Protocol S SLAVE ADDRESS W A 7bit = 5Eh ・Read Protocol S SLAVE ADDRESS 7bit = 5Eh REGISTER ADDRESS 8bit REGISTER ADDRESS 8bit from Master to Slave from Slave to Master W A www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. A WRITE DATA A P S SLAVE ADDRESS R A 8bit A S P R W A N 5/14 READ DATA N 7bit = 5Eh 8bit = START condition = STOP condition = data direction READ (SDA HIGH) = data direction WRITE (SDA LOW) = acknowledge (SDA LOW) = not acknowledge (SDA HIGH) 2009.04 - Rev.B P Technical Note BU21010MUV ●Register map Address Register name R/W Length 1*h SENS_DATA R 1byte / channel 32h BTN R 1byte Button On/Off. 35h BTN_STATE R 1byte Button state data. 4*h OFFSET R 1byte / channel 60h, 61h GES_VEL R 2byte Gesture duration. 62h GES_DIR R 1byte Gesture direction. E2h GES_CLR W 1byte Gesture clear control. E3h GES_CTL R/W 1byte Gesture control. E4h GES_CLK R/W 1byte Gesture clock setting. E5h GES_TIMEOUT R/W 1byte Gesture time-out data setting. EEh CALIB W 1byte Soft calibration execution. EFh DONE R/W 1byte Setting done command. F0h SENS_CH R/W 1byte Sensor channel enables. F2h LED_CH R/W 1byte LED channel enables. F3h IDLE_CH R/W 1byte Idle mode release control. F5h LED_LINK R/W 1byte LED linkage to sensor input. F6h TIMES R/W 1byte F7h TH_ON2 R/W 1byte F8h TH_ON2_CH R/W 1byte Per channel selection of whether to use TH_ON or TH_ON2. FAh CMD R/W 1byte Simultaneous press and idle mode entry. FBh GAIN_FILTER R/W 1byte Gain setting, filter function. FCh TH_ON R/W 1byte FDh TH_OFF R/W 1byte FEh DLED R/W 1byte www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Explanation Sensor output data. One for each channel. Offset correction data. One for each channel. Defines the sampling interval and number of samples required to recognize a button press. A second threshold value in the detection of a button going from OFF state to ON state. A threshold value in the detection of a button going from OFF state to ON state. A threshold value in the detection of a button going from ON state to OFF state. Register to allow simple writing to LEDs. 6/14 2009.04 - Rev.B Technical Note BU21010MUV 【1*h : Sensor Output Data】 Name: SENS_DATA Address: 1* h (one byte per sensor channel) Description: The sensor output that converts to 10bit. Scaling, offsets and filtering (when enabled) are applied. The most significant 8 bits are presented to the software with this register. 1*h R/W Initial val. Bit7 SD_*[7] R 1 Bit6 SD_*[6] R 0 Bit5 SD_*[5] R 0 Bit4 SD_*[4] R 0 Bit3 SD_*[3] R 0 Bit2 SD_*[2] R 0 Bit1 SD_*[1] R 0 Bit0 SD_*[0] R 0 【32h : Button On/Off 】 Name: BTN Address: 32h Description: This is the state of the sensor when considered as an ON/OFF button. Here 1 : On. 0 :Off. 32h R/W Initial val. Bit7 CH7 R 0 Bit6 CH6 R 0 Bit5 CH5 R 0 Bit4 CH4 R 0 Bit3 CH3 R 0 Bit2 CH2 R 0 Bit1 CH1 R 0 Bit0 CH0 R 0 【35h : Button State Data】 Name: BTN_STATE Address: 35h Description: This provides information about the press. CH[3:0] : Effective channel ： This indicates which button is dominant. SIMUL : Button effective ： This indicates that the effective channel corresponds to a valid button press according to the thresholds. 1 : On. 0 : Off. CONTINU : A push and hold is effective ： Indicates that the button was pressed and held for more than push/hold judgment time. 1 : On. 0 : Off. 35h R/W Initial val. Bit7 CONTINU R 0 Bit6 - Bit5 - Bit4 SIMUL R 0 Bit3 CH[3] R 0 Bit2 CH[2] R 0 Bit1 CH[1] R 0 Bit0 CH[0] R 0 【4* h : Offset Correction Data】 Name: OFFSET Address: 4* h (one byte per sensor channel) Description: This is the offset required to correct the sense data to half scale during the calibration procedure. 4*h R/W Initial val. Bit7 OFS_*[7] R 1 Bit6 OFS_*[6] R 0 Bit5 OFS_*[5] R 0 Bit4 OFS_*[4] R 0 Bit3 OFS_*[3] R 0 Bit2 OFS_*[2] R 0 Bit1 OFS_*[1] R 0 Bit0 OFS_*[0] R 0 Bit1 VEL[1] VEL[9] R 0 Bit0 VEL[0] VEL[8] R 0 【60h / 61h : Gesture Duration】 Name: GES_VEL Address: 60h, 61h Description: Indicates the duration of the gesture in number of internal clocks. The count is a clock set with 0xE4(GES_CLK). It is possible to count up to 0～4095 clocks. Gesture duration＝（gesture sampling interval） * VEL [sec] 60h 61h R/W Initial val. Bit7 VEL[7] R 0 Bit6 VEL[6] R 0 www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Bit5 VEL[5] R 0 Bit4 VEL[4] R 0 7/14 Bit3 VEL[3] VEL[11] R 0 Bit2 VEL[2] VEL[10] R 0 2009.04 - Rev.B Technical Note BU21010MUV 【62h : Gesture Direction Judgment】 Name: GES_DIR Address: 62h Description: Gesture direction judgment DIR_A : gesture direction A 0xE3(GES_CTL) reference DIR_B : gesture direction B 0xE3(GES_CTL) reference 62h R/W Initial val. Bit7 - Bit6 - Bit5 - Bit4 - Bit3 - Bit2 - Bit1 DIR_B R 0 Bit0 DIR_A R 0 Bit2 - Bit1 - Bit0 - 【E2h : Gesture Clear】 Name: GES_CLR Address: E2h Description: This register when written to clears GES_VEL and GES_DIR. It is cleared by one, and it returns to 0 by the automatic operation. E2h R/W Initial val. Bit7 CLR W 0 Bit6 - Bit5 - Bit4 - Bit3 - 【E3h : Gesture Function Setting】 Name: GES_CTL Address: E3h Description: This register controls what key-press sequence is recognized as a gesture. Only 4 channels may be used - SIN0, SIN2, SIN4, and SIN6. EN : enable These are the enable bits. One is provided for each of the 4 sense inputs used for gesture. EN[0] is for SN0, EN[1] is for SN2, EN[2] is for SN4 and EN[3] is for SN6. 1 is to enable and 0 is for disable. MODE : mode 0 : Requires all sensors to be present in the sequence before the gesture is recognized.（All detection mode） 1 : Allows one or more of the keys to be missed in the sequence.（Verbose mode） The condition and the direction of detection that can be detected in each mode are as follows. mode MODE All detection 0 Direction（GES_DIR） DIR_A DIR_B DIR_A Verbose 1 DIR_B E3h R/W Initial val. Bit7 - Bit6 - www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Bit5 - Bit4 MODE W 1 8/14 Bit3 EN[3] W 1 Detected 1)SIN0→SIN2→SIN4→SIN6 1)SIN6→SIN4→SIN2→SIN0 1)SIN0→SIN2→SIN4 2)SIN0→SIN2→ SIN6 3) SIN2→SIN4→SIN6 4)SIN0→ SIN4 5) SIN2→ SIN6 1)SIN6→SIN4→SIN2 2)SIN6→SIN4→ SIN0 3) SIN4→SIN2→SIN0 4)SIN6→ SIN2 5) SIN4→ SIN0 Bit2 EN[2] W 1 Bit1 EN[1] W 1 Bit0 EN[0] W 1 2009.04 - Rev.B Technical Note BU21010MUV 【E4h : Gesture Clock Setting】 Name: GES_CLK Address: E4h Description: This register allows setting of the time base for the gesture detection. It sets a divide ratio of the clock used. The maximum judgment time and the sampling interval of the gesture can be set by changing this clock. Gesture sampling interval = 1 / ( ( Internal oscillation frequency) / ( 2 * 16 * 16 ) * 1 [sec] 1 / ( ( Internal oscillation frequency) / ( 2 * 16 * 16 ) * 2 [sec] 1 / ( ( Internal oscillation frequency) / ( 2 * 16 * 16 ) * 4 [sec] 1 / ( ( Internal oscillation frequency) / ( 2 * 16 * 16 ) * 8 [sec] … G_DIV = 0 … G_DIV = 1 … G_DIV = 2 … G_DIV = 3 Gesture maximum judgment time＝（Gesture sampling interval） * TO * 16 [sec] For example with an internal clock of 1.1MHz G_DIV 0 1 2 3 E4h R/W Initial val. Bit7 - Gesture sampling interval[msec] 0.46 0.93 1.86 3.72 Bit6 - Bit5 - Bit4 - Gesture maximum judgment time [sec] 1.90 3.81 7.62 15.2 Bit3 - Bit2 - Bit1 G_DIV[1] W 1 Bit0 G_DIV[0] W 0 【E5h : Gesture Timeout Data Setting】 Name: GES_TIMEOUT Address: E5h Description: The maximum judgment time of the gesture is set. A key sequence which exceeds this time is not recognized. Gesture Maximum Judgment Time＝（Gesture sampling interval） * TO * 16 [sec] E5h R/W Initial val. Bit7 TO[7] W 1 Bit6 TO[6] W 1 Bit5 TO[5] W 1 Bit4 TO[4] W 1 Bit3 TO[3] W 1 Bit2 TO[2] W 1 Bit1 TO[1] W 1 Bit0 TO[0] W 1 【EEh : Soft Calibration】 Name: CALIB Address: EEh Description: This forces a chip re-calibration when a 1 is written and returns to 0 afterward automatically. Please note that one should always re-calibrate after changing the gain adjustment value. EEh R/W Initial val. Bit7 - Bit6 - Bit5 - Bit4 - Bit3 - Bit2 - Bit1 - Bit0 CALIB W 0 Bit2 - Bit1 - Bit0 DONE W 0 【EFh : Setting Done, Detect Start】 Name: DONE Address: EFh Description: This register should be written to following register updates. EFh R/W Initial val. Bit7 - Bit6 - www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Bit5 - Bit4 - 9/14 Bit3 - 2009.04 - Rev.B Technical Note BU21010MUV 【F0h : Sensor Channel Setting】 Name: SENS_CH Address: F0h Description: Individual enabling and disabling of sensor channels. 1：Effective 0：Not in use F0h R/W Initial val. Bit7 SIN7 W 0 Bit6 SIN6 W 0 Bit5 SIN5 W 0 Bit4 SIN4 W 0 Bit3 SIN3 W 0 Bit2 SIN2 W 0 Bit1 SIN1 W 0 Bit0 SIN0 W 0 Bit2 LED2 W 0 Bit1 LED1 W 0 Bit0 LED0 W 0 【F2h : LED Channel Setting】 Name: LED_CH Address: F2h Description: Enables and disables the channels to be used as LED outputs. Valid for the 8 LED outputs.1：Effective 0：Not in use F2h R/W Initial val. Bit7 - Bit6 - Bit5 - Bit4 - Bit3 LED3 W 0 【F3h : Idle Exit Condition】 Name: IDLE_CH Address: F3h Description: Defines which channels cause the device to wake up – i.e. go from idle mode to normal operation on a key press. Selection is made on a per channel basis. 1：Effective 0：Not used F3h R/W Initial val. Bit7 SIN7 W 1 Bit6 SIN6 W 1 Bit5 SIN5 W 1 Bit4 SIN4 W 1 Bit3 SIN3 W 1 Bit2 SIN2 W 1 Bit1 SIN1 W 1 Bit0 SIN0 W 1 【F5h : LED to Sensor Linkage】 Name: LED_LINK Address: F5h Description: Allows the LED outputs to be automatically linked to the input channels without need for any software control. 1 : It synchronizes with the button. 0 : It synchronizes with data (The register name: DLED) from host. F5h R/W Initial val. Bit7 - Bit6 - Bit5 - Bit4 - Bit3 LED3 W 1 Bit2 LED2 W 1 Bit1 LED1 W 1 Bit0 LED0 W 1 【F6h : Sampling Interval and Number of Samples Used for Button Press】 Name: TIMES Address: F6h Description: Defines the sampling interval and number of samples required to recognise as a button press. CONT_T[3:0] : Push and hold judgment time ： Governs how long it is before the chip decides it is push and hold. Given by the following equation: 19 Push-Hold Time = system clock x 2 x CONT_T (Example: system clock 1[MHz] time : About 520[msec]). SAMP[3:0] : Sampling Interval ： Given by the following equation: 13 Sampling interval = system clock x 2 x SAMP (Example: system clock 1[MHz] time : About 8.2[msec]). F6h R/W Initial val. Bit7 CONT_T[3] W 0 Bit6 CONT_T[2] W 0 www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Bit5 CONT_T[1] W 0 Bit4 CONT_T[0] W 0 10/14 Bit3 SAMP[3] W 0 Bit2 SAMP[2] W 0 Bit1 SAMP[1] W 0 Bit0 SAMP[0] W 0 2009.04 - Rev.B Technical Note BU21010MUV 【F7h : Button OFF→ON Threshold】 Name: TH_ON2 Address: F7h Description: A second threshold value for determining a button off→on judgment of sensor. The sensor output value of 8bit (register SENS_DATA) is compared with 128+ ON2 [6:0], and if it is larger, the button is determined active. F7h R/W Initial val. Bit7 - Bit6 ON2[6] W 0 Bit5 ON2[5] W 0 Bit4 ON2[4] W 1 Bit3 ON2[3] W 0 Bit2 ON2[2] W 0 Bit1 ON2[1] W 0 Bit0 ON2[0] W 0 【F8h : Button OFF→ON Threshold Selection】 Name: TH_ON2_CH Address: F8h Description: This register is used to relate either threshold TH_ON or TH_ON2 to particular sensor channels for button press activity determination. 1 : TH_ON2 is applied 0 :TH_ON is applied F8h R/W Initial val. Bit7 SIN7 W 0 Bit6 SIN6 W 0 Bit5 SIN5 W 0 Bit4 SIN4 W 0 Bit3 SIN3 W 0 Bit2 SIN2 W 0 Bit1 SIN1 W 0 Bit0 SIN0 W 0 【FAh: Simultaneous Press and Idle Mode Entry】 Name: CMD Address: FAh Description: SIMUL_SEL : Simultaneous push judgment element choice ： In the case of simultaneous key press a decision must be made to select the dominant channel. The chip allows for two alternative methods. Either it can be based on whichever key press was first, or the priority can be based on the highest signal level. 1 : A level of a sensor gives priority 0 : Give priority to the channel pushed earliest INTERMIT_EN : Intermittent and the drive are enable. ： Whether intermittent is driven at the idol mode is selected. 1：Intermittent is driven. 0：Intermittent is not driven. Initial state：Intermittent is driven. IDLE_T[3:0] : non-detect time-out setting ： This sets the time the chip takes to go from normal mode to idle mode in a period key inactivity. 19 Duration = system clock x 2 x IDLE_T (Example of system clock 1[MHz]time : About 520[msec]) FAh R/W Initial val. Bit7 SIMUL_SEL W 0 Bit6 - Bit5 - Bit4 INTERMIT_EN W 1 Bit3 IDLE_T[3] W 0 Bit2 IDLE_T[2] W 1 Bit1 IDLE_T[1] W 1 Bit0 IDLE_T[0] W 1 【FBh : Gain Setting, Filter Function】 Name: GAIN_FILTER Address: FBh Description: Gain adjustment and setting of noise filter function GAIN[2:0] : gain setting ： It uses it for the gain adjustment in eight stages. Initial adjustment value：x1 GAIN[2:0] 000 001 010 011 100 Adjustment value x1 x 4.22 x 8.4 x 16.5 x 23 101 x 46 110 x 69 111 x 92 FILTER_EN : Filter enable ： Enables/disables setting of noise filter function 1 : enabled 0 : disabled Initial state : disabled DELTA[3:0] : Filter follow count setting ： The follow count to which the noise filter function is effective is set. FBh R/W Initial val. Bit7 GAIN[2] W 0 Bit6 GAIN [1] W 0 www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Bit5 GAIN[0] W 0 Bit4 FILTER_EN W 0 11/14 Bit3 DELTA[3] W 0 Bit2 DELTA[2] W 0 Bit1 DELTA[1] W 1 Bit0 DELTA[0] W 0 2009.04 - Rev.B Technical Note BU21010MUV 【FCh: Switch OFF -> ON Threshold】 Name: TH_ON Address: FCh Description: This register provides a threshold value for determining if a sensor has transitioned from OFF to ON. This is relative value from reference value (128d). So the absolute value of threshold is 128d + ON[6:0]. It makes a threshold value between TH_ON and TH_OFF. TH_ON must be bigger than TH_OFF (TH_ON >= TH_OFF) Maximum threshold is 256d and minimum value is 128d. FCh R/W Initial val. Bit7 - Bit6 ON[6] W 0 Bit5 ON[5] W 0 Bit4 ON[4] W 1 Bit3 ON[3] W 0 Bit2 ON[2] W 0 Bit1 ON[1] W 0 Bit0 ON[0] W 0 【FDh: Switch ON -> OFF Threshold Value】 Name: TH_OFF Address: FDh Description: This register provides a threshold value for transitioning from ON to OFF. This is relative value from reference value (128d). So absolute value of threshold is 128d + OFF[6:0]. It makes a threshold value between TH_ON and TH_OFF. TH_OFF must be smaller than TH_ON (TH_OFF =< TH_ON) Maximum value is 256d and minimum value is 128d. FDh R/W Initial val. Bit7 - Bit6 OFF[6] W 0 Bit5 OFF[5] W 0 Bit4 OFF[4] W 0 Bit3 OFF[3] W 0 Bit2 OFF[2] W 0 Bit1 OFF[1] W 0 Bit0 OFF[0] W 1 【FEh: LED Port Data】 Name: DLED Address: FEh Description: When LED is not linked with the sensor, it becomes a simple digital output that controls the LED. 1 : Light. 0 : Turned off. FEh R/W Initial val. Bit7 - Bit6 - www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Bit5 - Bit4 - 12/14 Bit3 D3 W 0 Bit2 D2 W 0 Bit1 D1 W 0 Bit0 D0 W 0 2009.04 - Rev.B Technical Note BU21010MUV ●Operation mode This IC has a normal mode, idle mode and a shutdown mode as states of operation. 【Normal mode】 This is the normal operation of the device. Output pin INT="L". 【Idle mode】 This is the mode when the normal mode times out due to inactivity on the keys. In this mode the control interface is still alive. *Usually time-out is aimed at about 200msec or less. *Transition between normal and idle modes is automatic and without software control. 【Shutdown mode】 In this mode the device is completely stopped – and reset. This is achieved by making the terminal SDN L. All analog circuits and the logic circuits are stopped. The return from the shutdown mode returns by making the terminal SDN H. *After shut-down all registers have their default values. ●Initialization procedure A normal power on sequence is: (1) Power on (2) Setup the registers (3) Write ‘1’ to 0xEF (done register) <sensing operation begins after auto-calibration occurs> ●Power supply turning on procedure You should always power on DVDD at the same time as AVDD or before AVDD. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 13/14 2009.04 - Rev.B Technical Note BU21010MUV ●Ordering part number B U 2 Part No 1 0 1 0 M Part No U V - Package MUV : VQFN016V3030 E 2 Packaging and forming specification E2：Embossed tape and reel VQFN016V3030 <Tape and Reel information> 3.0±0.1 3.0±0.1 0.5 5 13 0.75 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 ) 4 16 8 12 E2 9 1.4±0.1 0.4±0.1 1 3000pcs (0.22) 1.4±0.1 +0.03 0.02 –0.02 1.0MAX S C0.2 Embossed carrier tape Quantity Direction of feed 1PIN MARK 0.08 S Tape +0.05 0.25 –0.04 1pin (Unit : mm) www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Reel 14/14 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. 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Please be sure to implement in your equipment using the Products safety measures to guard against the possibility of physical injury, fire or any other damage caused in the event of the failure of any Product, such as derating, redundancy, fire control and fail-safe designs. ROHM shall bear no responsibility whatsoever for your use of any Product outside of the prescribed scope or not in accordance with the instruction manual. The Products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel-controller or other safety device). ROHM shall bear no responsibility in any way for use of any of the Products for the above special purposes. If a Product is intended to be used for any such special purpose, please contact a ROHM sales representative before purchasing. If you intend to export or ship overseas any Product or technology specified herein that may be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to obtain a license or permit under the Law. Thank you for your accessing to ROHM product informations. More detail product informations and catalogs are available, please contact us. ROHM Customer Support System http://www.rohm.com/contact/ www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. R0039A