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PDF BU21079F Data sheet ( Hoja de datos )
| Número de pieza | BU21079F | |
| Descripción | Capacitive Switch Controller ICs | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Capacitive Controller ICs
Capacitive Switch Controller ICs
BU21079F
General Description
BU21079F is a capacitive switch controller used for
operating switches.
Low power consumption is achieved using the
intermittent operation mode.
In addition to a regular simple switch, it supports matrix
switches which are arranged in the matrix sensors. If
external noise and temperature drift are detected, the
automatic self-calibration is activated.
Features
■ 8 capacitive sensor ports
■ Supports matrix switches. Maximum of 16
switches.
■ Automatic self-calibration
■ Continued touch detection
■ Sends an interrupt when there is a detected result
of switch operation
■ 2-wire serial bus interface
■ 3.3V or 5.0V single power supply
■ Built-in Power-On-Reset and Oscillator
Applications
■ Electronic devices with multiple switches.
■ Information appliances such as printers.
■ AV appliances such as digital TV and HDD
recorder.
■ Notebook PC.
■ Air-conditioner. Refrigerator. Electrical rice cooker.
Typical Application Circuit
Key Specifications
■ Input voltage range
■ Operating temperature range
■ Operating current
■ Detect cycle
Packages
BU21079F :
3.0V to 5.5V
-25℃ to 85℃
2.5mA (Typ)
6msec (Typ)
SOP16
10.00 ㎜×6.20 ㎜×1.71 ㎜
Figure 1. Typical Application Circuit
○Product structure：Silicon monolithic integrated circuit
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This product has no designed protection against radioactive rays
1/34
TSZ02201-0Y1Y0FZ00150-1-2
2013.09.25 Rev.001
http://www.Datasheet4U.com
1 page  
BU21079F
Datasheet
Absolute Maximum Ratings (Ta = 25℃)
Parameter
Symbol
Rating
Unit
Power supply voltage
VDD
-0.5 to 7.0
V
Input voltage
VIN -0.5 to VDD + 0.3 V
Storage temperature range
Tstg
-55 to 125
℃
Permissible loss
Pd
0.30 *1
W
Maximum junction temperature
Tjmax
125
℃
*1 Derate by 3.00mW/℃ when operating above Ta =25℃. (IC only).
When mounted in a Rohm standard board (70mm x 70mm x 1.6t mm), Pd is 0.50W, and it reduces in 5.00mW/℃ over Ta=25℃.
Recommended Operating Conditions
Parameter
Symbol
Power supply voltage
VDD
Operating temperature range
Topr
Rating
3.0 to 5.5
-20 to 85
Unit
V
℃
Electrical Characteristics (Ta = 25℃ , VDD = 3.3V , VSS = 0V)
Parameter
Symbol
Min.
Rating
Typ.
Max.
Unit
Input High voltage
VIH VDD x 0.7 - VDD + 0.3 V
Condition
Input Low voltage
VIL VSS - 0.3 - VDD x 0.3 V
Output High voltage
VOH VDD - 0.5
-
VDD
V IOH = -4mA
Output Low voltage
VOL VSS
- VSS + 0.5 V IOL = 4mA
Oscillator clock frequency1
fOSC1
45
50
55 MHz
Oscillator clock frequency2
fOSC2
51.2
64
76.8 KHz
DVDD LDO output voltage
VDVDD
1.35
1.50
1.65
V
AVDD LDO output voltage
VAVDD
2.61
2.71
2.81
V
Full scan operating current IDD - 2.5 - mA No load of sensors.
Intermittent operating current
IINT
75
uA
Intermittent operation cycle
200ｍｓ
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/34
TSZ02201-0Y1Y0FZ00150-1-2
2013.09.25 Rev.001
http://www.Datasheet4U.com
5 Page 
BU21079F
Datasheet
【0x85, 0x8A : Software Reset】
Name:
SRST
Address: 0x85, 0x8A
Description: These registers are used for hardware reset. If register 0x85=55h and register 0x8A=AAh, then a hardware
reset will be done.
0x85
0x8A
R/W
Initial val.
Bit7
SRST[7]
SRST[15]
R/W
0
Bit6
SRST[6]
SRST[14]
R/W
0
Bit5
SRST[5]
SRST[13]
R/W
0
Bit4
SRST[4]
SRST[12]
R/W
0
Bit3
SRST[3]
SRST[11]
R/W
0
Bit2
SRST[2]
SRST[10]
R/W
0
Bit1
SRST[1]
SRST[9]
R/W
0
Bit0
SRST[0]
SRST[8]
R/W
0
【0xC0 – 0xC4 : Select a setting for Gain and Threshold for “Off→On”】
Name:
CFG_SIN
Address: 0xC0 – 0xC4
Description: You can set 3 values for gain and set 3 values for threshold to the “Off → On” registers of this IC.
These registers are used to select a setting for gain and threshold for every sensor. There are three
available settings.
Gain：GA_SIN*[1:0] =
0x0 : Select GA0.
0x1 : Select GA1.
0x2 : Select GA2.
0x3 : Select GA0.
Threshold：ON_SIN*[1:0] = 0x0 : Select ON0.
0x1 : Select ON1.
0x2 : Select ON2.
0x3 : Select ON0.
0xC0
0xC1
0xC2
0xC3
0xC4
R/W
Initial val.
Bit7
GA_SIN1[1]
GA_SIN3[1]
GA_SIN5[1]
GA_SIN7[1]
-
R/W
0
Bit6
GA_SIN1[0]
GA_SIN3[0]
GA_SIN5[0]
GA_SIN7[0]
-
R/W
0
Bit5
ON_SIN1[1]
ON_SIN3[1]
ON_SIN5[1]
ON_SIN7[1]
-
R/W
0
Bit4
ON_SIN1[0]
ON_SIN3[0]
ON_SIN5[0]
ON_SIN7[0]
-
R/W
0
Bit3
GA_SIN0[1]
GA_SIN2[1]
GA_SIN4[1]
GA_SIN6[1]
GA_SIN8[1]
R/W
0
Bit2
GA_SIN0[0]
GA_SIN2[0]
GA_SIN4[0]
GA_SIN6[0]
GA_SIN8[0]
R/W
0
Bit1
ON_SIN0[1]
ON_SIN2[1]
ON_SIN4[1]
ON_SIN6[1]
ON_SIN8[1]
R/W
0
Bit0
ON_SIN0[0]
ON_SIN2[0]
ON_SIN4[0]
ON_SIN6[0]
ON_SIN8[0]
R/W
0
【0xC8 – 0xC9 : Value of GAIN】
Name:
GA0、GA1、GA2
Address: 0xC8 – 0xC9
Description: This register is used for setting the gain of AFE. The smaller the value of GA, the higher the gain will be.
You can set 3 values for gain. These values are assigned to each sensor by register GA_SIN including
CFG_SIN.
The settable range： 0x1 ≦ GA ≦ 0xF
0xC8
0xC9
R/W
Initial val.
Bit7
GA1[3]
-
R/W
0
Bit6
GA1[2]
-
R/W
0
Bit5
GA1[1]
-
R/W
0
Bit4
GA1[0]
-
R/W
0
Bit3
GA0[3]
GA2[3]
R/W
0
Bit2
GA0[2]
GA2[2]
R/W
0
Bit1
GA0[1]
GA2[1]
R/W
0
Bit0
GA0[0]
GA2[0]
R/W
0
【0xCA – 0xCC : Value of the threshold for "Off → On"】
Name:
ON0、ON1、ON2
Address: 0xCA – 0xCC
Description: These registers are used for setting the threshold of the “Off → On” operation. You can set 3 values for
threshold. If the 8bit ADC value of each sensor (register SENS_DATA) is larger than this value, then the
“Off → On” operation of the sensor is valid. These values are assigned to each sensor by register GA_SIN
including ON_SIN.
The settable range ： 0x00 ＜ OFF ＜ ON ＜ 0xFF
0xCA
0xCB
0xCC
R/W
Initial val.
Bit7
ON0[7]
ON1[7]
ON2[7]
R/W
0
Bit6
ON0[6]
ON1[6]
ON2[6]
R/W
0
Bit5
ON0[5]
ON1[5]
ON2[5]
R/W
0
Bit4
ON0[4]
ON1[4]
ON2[4]
R/W
0
Bit3
ON0[3]
ON1[3]
ON2[3]
R/W
0
Bit2
ON0[2]
ON1[2]
ON2[2]
R/W
0
Bit1
ON0[1]
ON1[1]
ON2[1]
R/W
0
Bit0
ON0[0]
ON1[0]
ON2[0]
R/W
0
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/34
TSZ02201-0Y1Y0FZ00150-1-2
2013.09.25 Rev.001
http://www.Datasheet4U.com
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet BU21079F.PDF ] | |
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