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PDF BU21078FV Data sheet ( Hoja de datos )
| Número de pieza | BU21078FV | |
| Descripción | Capacitive Switch Controller ICs | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Capacitive Controller ICs
Capacitive Switch Controller ICs
BU21072MUV / BU21078MUV / BU21078FV
General Description
BU21072MUV/BU21078MUV/BU21078FV
is a capacitive sensor controller for switch operation.
In addition to a regular simple switch, support matrix
switches which are arranged in the matrix sensors. If
external noise and temperature drift are detected, the
automatic self-calibration is operated.
Include LED controller with PWM function.
Features
■ 10 capacitive sensor ports.
(BU21072MUV)
12 capacitive sensor ports.
(BU21078MUV / BU21078FV)
■ Supported Matrix switches.
Maximum 16 switches.
(BU21072MUV)
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.
■ 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.
Typical Application Circuit
VDD
VDD
VDD
VDD
Key Specifications
■ Input voltage range
■ Operating temperature range
■ Operating current
3.0 to 5.5V
-20 to 85°C
3.5mA (Typ.)
■ Scan rate
Packages
BU21072MUV :
VQFN024V4040
BU21078MUV :
VQFN028V5050
BU21078FV :
SSOP-B28
16msec (Typ.)
4.00 ㎜×4.00 ㎜×1.00 ㎜
5.00 ㎜×5.00 ㎜×1.00 ㎜
10.00 ㎜×7.60 ㎜×1.35 ㎜
VQFN024V4040
VQFN028V5050
SSOP-B28
21
22
SIN7 (*2)
SIN6
SIN13
SIN5
SIN14
SIN4
SIN3
28
1
BU21078
TOP VIEW
15
14
LED0
INT
SDA
SCL
TEST
VSS
DVDD 1.0uF
8
7 VDD
VDD
HOST
(*1) Unused LED pin are OPEN.
(*2) Unused SIN pin are OPEN.
Recommended DT number : DTC143ZE
Figure 1. Typical Application Circuit
○Product structure：Silicon monolithic integrated circuit
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This product is not designed protection against radioactive rays
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14.Jul.2016 Rev.004
1 page  
BU21072MUV / BU21078MUV / BU21078FV
Absolute Maximum Ratings (Ta = 25°C)
Parameter
Symbol
Power supply voltage
VDD
Input voltage
VIN
Storage temperature range
Tstg
BU21072MUV
Power dissipation
BU21078MUV
BU21078FV
Pd
Maximum junction temperature
*1 Derated by 2.72mW/°C over 25°C. (IC only).
*2 Derated by 3.04mW/°C over 25°C. (IC only).
*3 Derated by 6.4mW/°C over 25°C. (IC only).
Tjmax
Recommended Operating Ratings
Parameter
Symbol
Power supply voltage
VDD
Operating temperature range
Topr
Rating
-0.5 to 7.0
-0.5 to VDD + 0.3
-55 to 125
272 *1
304 *2
640 *3
125
Rating
3.0 to 5.5
-20 to 85
Unit
V
V
°C
mW
°C
Unit
V
°C
Electrical Characteristics (Ta = 25°C , VDD = 3.3V , VSS = 0V)
Parameter
Symbol
Min.
Input High voltage
VIH VDD x 0.7
Input Low voltage
VIL VSS - 0.3
Output High voltage
VOH VDD - 0.5
Output Low voltage
VOL VSS
Oscillator clock frequency
fOSC
45
DVDD LDO output voltage
VDVDD
1.35
AVDD LDO output voltage
VAVDD
2.63
Power-on-reset release voltage
2.25
Power-on-reset detect voltage
2.10
Operating current
IDD -
Rating
Typ.
-
-
-
-
50
1.50
2.73
-
-
3.5
Max.
VDD + 0.3
Unit
V
Condition
VDD x 0.3 V
VDD
V IOH = -4mA
VSS + 0.5 V IOL = 4mA
55 MHz
1.65 V
2.83 V
2.55 V
2.40 V
- mA Without load of sensors.
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/36
TSZ02201-0L5L0F300640-1-2
14.Jul.2016 Rev.004
5 Page 
BU21072MUV / BU21078MUV / BU21078FV
【0xCE :Configuration oversampling】
Name:
OSTIMES
Address:
0xCE
Description: OST[3:0]：This register is the number of times of oversampling for canceling chattering to the “ON” or
“OFF” operation. If the continuance of the “ON” or “OFF” operations is lower than this register,
the operations are ignored.
If this register value is 0, the number of times of oversampling is 1.
Sampling rate：About 16[msec].
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
0xCE
OST[3]
OST[2]
OST[1]
OST[0]
-
-
-
-
R/W R/W
R/W
R/W
R/W
-
-
-
-
Initial val.
0
0
0
0
----
【0xCF : Configuration continuous touch】
Name:
CONTTIMES
Address:
0xCF
Description: CONTSEL：This register is to select the interrupt frequency by detection continuous touch.
1 : Every continuous touch period.
0 : First detect only.
CONT[5:0]：Continuous touch period is about 0.1[sec] x CONT.
If the setting value is 0x0, continuous touch function is disable.
(0.1sec ≦ Continuous touch period ≦ 6.3sec)
0xCF
R/W
Initial val.
Bit7
CONTSEL
R/W
0
Bit6
-
-
-
Bit5
CONT[5]
R/W
0
Bit4
CONT[4]
R/W
0
Bit3
CONT[3]
R/W
0
Bit2
CONT[2]
R/W
0
Bit1
CONT[1]
R/W
0
Bit0
CONT[0]
R/W
0
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/36
TSZ02201-0L5L0F300640-1-2
14.Jul.2016 Rev.004
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet BU21078FV.PDF ] | |
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