Capacitive Controller ICs Capacitive Switch Controller ICs BU21072MUV / BU21078MUV / BU21078FV General Description Key Specifications BU21072MUV/BU21078MUV/BU21078FV Input voltage range 3.0 to 5.5V is a capacitive sensor controller for switch operation. Operating temperature range -20 to 85C In addition to a regular simple switch, support matrix Operating current 3.5mA (Typ.) switches which are arranged in the matrix sensors. If external noise and temperature drift are detected, the Scan rate 16msec (Typ.) automatic self-calibration is operated. Include LED controller with PWM function. Packages BU21072MUV : Features 10 capacitive sensor ports. VQFN024V4040 4.00 4.00 1.00 (BU21072MUV) 12 capacitive sensor ports. BU21078MUV : (BU21078MUV / BU21078FV) VQFN028V5050 5.00 5.00 1.00 Supported Matrix switches. Maximum 16 switches. BU21078FV : (BU21072MUV) SSOP-B28 10.00 7.60 1.35 Maximum 36 switches. (BU21078MUV / BU21078FV) Automatic self-calibration. Continued touch detection. LED controller with PWM function. Inform the detected result of switch operation by interrupt. 2-wire serial bus interface. Single power supply. VQFN024V4040 VQFN028V5050 Built-in Power-On-Reset and Oscillator. Applications Appliance that require multiple switches. Information appliance as printer. AV appliance as digital TV and HDD recorder. Notebook PC. SSOP-B28 Typical Application Circuit VDD VDD VDD VDD VDD 21 15 22 14 SIN7 (*2) LED0 SIN6 INT SDA SIN13 HOST BU21078 SCL SIN5 TOP VIEW TEST SIN14 VSS SIN4 DVDD SIN3 1.0uF 28 8 1 7 VDD (*1) Unused LED pin are OPEN. (*2) Unused SIN pin are OPEN. Recommended DT number : DTC143ZE Figure 1. Typical Application Circuit Product structureSilicon monolithic integrated circuit This product is not designed protection against radioactive rays w ww.rohm.com TSZ02201-0L5L0F300640-1-2 2012 ROHM Co., Ltd. All rights reserved. 1/36 TSZ2211114001 14.Jul.2016 Rev.004 DT R LED DT R LED SIN12 LED7 SIN2 LED6 (*1) DT SIN11 R LED LED5 (*1) SIN1 LED4 SIN0 (*2) LED3 (*1) DT AVDD LED2 R LED 2.2uF VDD LED1 (*1) 0.1uF 4.7k 4.7kBU21072MUV / BU21078MUV / BU21078FV OVERVIEW BU21072MUV/BU21078MUV/BU21078FV is a capacitive sensor controller for switch operation. Included blocks are AFE (Analog Front End) detecting capacitance, A/D converter, MPU, LED ports with PWM function, 2-wire serial bus interface compatible with I2C protocol, power-on-reset, oscillator. Operate with a 3.0 to 5.5V single power supply. The results that detected switch operations (Touch/Release/Hold) are held to each register. An interrupt is send from INT port to the host when a register is updated by detected operations. If external noise and temperature drift are detected, run automatic self-calibration. Without periodic polling, offer the reduction of the host load. LED ports are able to be applied PWM function. PWM function offers fade-in / fade-out brightness control. Simple switch One sensor is assigned to one switch. Each simple switch has the registers of detected Touch/Release/Hold operations. Simple switches support to multi-detect Touch/Release/Hold. Unused simple switches are maskable. Matrix switches The cross points of the sensors which are arranged in a matrix are able to assigned to individual switches. Each matrix switch has the registers of detected Touch/Release/Hold operations. Matrix switches do not support to multi-detect Touch/Release/Hold. Not used matrix switches are maskable. BU21072MUV supports 16 matrix switches configured by 4x4 sensors, and BU21078MUV / BU21078FV supports 36 matrix switches configured by 6x6 sensors. Automatic self-calibration BU21072MUV/BU21078MUV/BU21078FV has observed the situation surrounding the sensor based on the detection result. If external noise and temperature drift are detected, the automatic self-calibration is operated for the stable detection result. LED controller with PWM timers LED controller is High active. Each LED port is assigned to a choice of four PWM timers. If the situation surrounding the sensor is changed by the switching LED, it is useable that calibration is operated by sending LED control command. Host interface BU21072MUV/BU21078MUV/BU21078FV is slave device for the host device. 2-wire serial bus is compatible with I2C protocol. Slave Address : 0x5C(BU21072MUV) , 0x5D(BU21078MUV / BU21078FV) Pin Configurations 21 15 18 13 28 1 12 22 19 14 LED5 LED4 INT SIN7 LED0 SIN9 LED6 LED3 LED7 LED2 SIN6 SDA INT SIN8 SIN7 LED1 SCL SIN13 SDA SIN7 SIN6 LED0 BU21072MUV BU21078MUV SIN6 SIN5 SCL TEST SIN13 INT BU21078FV TOP VIEW TOP VIEW SIN5 SDA VSS SIN14 SIN5 TEST SIN14 SCL TOP VIEW SIN4 SIN4 DVDD VSS SIN4 TEST SIN3 DVDD SIN3 VSS 8 24 28 SIN12 DVDD 7 SIN2 VDD 1 6 1 7 SIN11 AVDD SIN1 SIN0 15 14 Figure 2. Pin configuration Figure 3. Pin configuration Figure 4. Pin configuration (BU21072MUV) (BU21078MUV) (BU21078FV) www.rohm.com TSZ02201-0L5L0F300640-1-2 2012 ROHM Co., Ltd. All rights reserved. 2/36 TSZ2211115001 14.Jul.2016 Rev.004 SIN3 LED5 SIN2 LED4 SIN1 LED3 LED2 SIN0 LED1 AVDD LED0 VDD LED7 SIN12 LED6 SIN2 LED5 SIN11 LED4 SIN1 LED3 SIN0 LED2 AVDD LED1 VDD