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BU21078FV-E2 bảng dữ liệu(PDF) 2 Page - Rohm

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Giải thích chi tiết về linh kiện  Capacitive Switch Controller ICs
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BU21072MUV / BU21078MUV / BU21078FV
TSZ02201-0L5L0F300640-1-2
© 2012 ROHM Co., Ltd. All rights reserved.
www.rohm.com
TSZ22111・15・001
14.Jul.2016 Rev.004
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
BU21072MUV
TOP VIEW
1
6
18
13
24
19
7
12
SIN9
SIN8
SIN7
SIN6
SIN5
SIN4
INT
SDA
SCL
TEST
VSS
DVDD
BU21078MUV
TOP VIEW
1
7
21
15
28
22
8
14
SIN7
SIN6
SIN13
SIN5
SIN14
SIN4
SIN3
LED0
INT
SDA
SCL
TEST
VSS
DVDD
SIN0
AVDD
VDD
DVDD
VSS
TEST
SCL
SDA
INT
LED0
LED1
LED4
SIN6
LED2
SIN1
SIN11
SIN2
SIN12
SIN3
SIN4
SIN14
SIN5
LED3
SIN13
SIN7
LED7
LED6
LED5
1
14
15
28
BU21078FV
TOP VIEW
Figure 2. Pin configuration
(BU21072MUV)
Figure 3. Pin configuration
(BU21078MUV)
Figure 4. Pin configuration
(BU21078FV)


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