Datasheet
Capacitive Controller ICs
Capacitive Switch Controller IC
BU21077MUV
General Description
BU21077MUV is a capacitive switch controller for switch
operation.
BU21077MUV has programmable MPU and it control the
sensing sequence and how to use value of sensor. It is
possible to reduce operational current with devising a
sensing sequence.
Key Specifications
■
■
Input Voltage Range
Operating Temperature Range
2.7 to 5.5V
-20 to +85°C
Package
VQFN020V4040
4.00
㎜×4.00 ㎜×1.00 ㎜
Features
■
■
■
■
■
Programmable MPU
8 Capacitive Sensor Ports
2-Wire Serial Bus Interface
Single Power Supply
Built-in Power-On-Reset and Oscillator
Applications
■
■
■
■
■
Portable Device such as Smart Phone, PDA.
Electronic Device with Multi Switches
Information Appliance such as Projector
AV Appliance such as Digital TV, HDD Recorder
PC / PC Peripheral Equipment such as Laptop PC
Typical Application Circuit
SIN2
SIN3
SIN4
15
16
SIN1
SIN0
2.2uF
1.0uF
AVDD
DVDD
RSTB
NC
NC
11
10
SIN5
SIN6
BU21077MUV
SIN7
TEST
INT
VDD
20
VDD
SDA
VSS
SCL
NC
VDD
6
1
5
4.7kΩ
4.7kΩ
1MΩ
HOST
1.0uF
Figure 1. Typical Application Circuit
〇Product
structure : Silicon monolithic integrated circuit
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
〇This
product has no designed protection against radioactive rays
1/12
TSZ02201-0L5L0F300820-1-2
14.Jul.2016 Rev.002
BU21077MUV
Pin Configurations
SIN2
SIN3
SIN4
NC
15
16
SIN1
SIN0
AVDD
DVDD
RSTB
NC
11
10
SIN5
SIN6
BU21077MUV
TOP VIEW
SIN7
TEST
INT
20
VSS
VDD
SDA
NC
SCL
6
1
5
Figure 2. Pin Configurations
Pin Descriptions
Pin
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Pin Name
VDD
VSS
NC
SCL
SDA
INT
TEST
SIN7
SIN6
SIN5
NC
SIN4
SIN3
SIN2
NC
SIN1
SIN0
AVDD
DVDD
RSTB
I/O
Power
Ground
-
In
InOut
Out
In
InOut
InOut
InOut
-
InOut
InOut
InOut
-
InOut
InOut
Power
Power
In
Functions
Power
Ground
-
Host-I/F SCL pin
Host-I/F SDA pin
Interrupt output
Test input
Sensor 7
Sensor 6
Sensor 5
-
Sensor 4
Sensor 3
Sensor 2
-
Sensor 1
Sensor 0
LDO output for analog blocks
LDO output for digital blocks
Reset bar input
Active ‘L’
Fix ‘L’ at the normal operation
Note
Power
-
-
-
VDD
VDD
VDD
VDD
AVDD
AVDD
AVDD
-
AVDD
AVDD
AVDD
-
AVDD
AVDD
-
-
VDD
Initial
Condition
-
-
-
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
-
Hi-Z
Hi-Z
Hi-Z
-
Hi-Z
Hi-Z
-
-
Hi-Z
I/O
Equivalent
Circuit
-
-
-
b
b
b
c
a
a
a
-
a
a
a
-
a
a
-
-
c
I/O Equivalent Circuits
AVDD
ASW
AIN
I
CIN
I
VDD
VDD
PAD
PAD
PAD
I
OEN
OEN
Figure 3. I/O Equivalent Circuit (a)
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
Figure 4. I/O Equivalent Circuit (b)
Figure 5. I/O Equivalent Circuit (c)
2/12
TSZ02201-0L5L0F300820-1-2
14.Jul.2016 Rev.002
BU21077MUV
Block Diagram
VDD
LDO25
VREF
LDO15
POR
OSC
AVDD
DVDD
LOGIC
MPU
AFE
Control
WDTR
A/D
Converter
AFE
C/V
Converter
Sensor
AFE
SIN*
PRAM
RSTB
WRAM
TEST
SDA
SCL
HOST I/F
INT
VSS
Figure 6. Block Diagram
Description of Blocks
●Sensor AFE, C/V Converter
Convert from capacitance to voltage for each sensor.
●A/D Converter
Convert from analog value to digital value.
●LDO25
2.5V output LDO for Sensor AFE, C/V Converter, and A/D converter.
●LDO15
1.5V output LDO for OSC and Logic blocks.
●OSC
Oscillator.
●POR
Power-On-Reset for system reset.
●MPU
Control sensor and sequence by program.
●PRAM
8kbyte Program RAM of MPU. It needs to download program from host.
●WRAM
Working RAM for MPU.
●HOST I/F
2-wire serial bus interface compatible with I2C protocol.
●AFE Control
Control sequencer for Sensor AFE, C/V Converter, and A/D Converter.
●WDTR
Watchdog timer reset. It issues a reset when the MPU is hang-upped.
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
3/12
TSZ02201-0L5L0F300820-1-2
14.Jul.2016 Rev.002
BU21077MUV
Absolute Maximum Ratings
(Ta = 25°C)
Parameter
Power Supply Voltage
Input Voltage
Operating Temperature Range
Storage Temperature Range
Power Dissipation
Maximum Junction Temperature
Symbol
VDD
V
IN
T
opr
T
stg
P
d
T
jmax
Rating
-0.5 to +7.0
-0.5 to VDD + 0.3
-20 to +85
-55 to +125
0.55
(Note 1)
Unit
V
V
°C
°C
W
°C
125
(Note 1) Derate by 5.5mW/°C when operating above Ta=25°C (mounted in 1-layer 74.2×74.2×1.6mm board with 10.22mm
2
surface capper area)
P
d
of IC is 0.27W and derate by 2.7mW/°C when operating above Ta=25°C.
Caution:
Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit
between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated over
the absolute maximum ratings.
Recommended Operating Condition
(Ta = -20 to +85°C)
Parameter
Power Supply Voltage
Symbol
VDD
Rating
2.7 to 5.5
Unit
V
Electrical Characteristics
(Ta = 25°C, VDD = 3.3V, VSS = 0V)
Parameter
Input High Voltage
Input Low Voltage
Output High Voltage
Output Low Voltage
OSC Frequency 1
OSC Frequency 2
DVDD Voltage
AVDD Voltage
Symbol
V
IH
V
IL
V
OH
V
OL
f
OSC1
f
OSC2
V
DVDD
V
AVDD
Min
VDD x 0.7
VSS - 0.3
VDD - 0.5
VSS
45
51.2
1.35
2.40
Typ
-
-
-
-
50
64
1.50
2.50
Max
VDD + 0.3
VDD x 0.3
VDD
VSS + 0.5
55
76.8
1.65
2.60
Unit
V
V
V
V
MHz
kHz
V
V
I
OH
= -4mA
I
OL
= +4mA
Conditions
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
4/12
TSZ02201-0L5L0F300820-1-2
14.Jul.2016 Rev.002
BU21077MUV
Host Interface
BU21077MUV has 2-wire serial bus interface. It is compatible with I2C protocol and BU21077MUV is a slave device.
Slave address of BU21077MUV is 5Ch (Shown 7-bit). And it supports Standard-mode (100 KHz) and Fast-mode (400
kHz). It has sequential read for reduce access time.
SDA
SCL
S
1-7
8
9
1-7
8
9
1-7
8
9
P
START
Address
R/W
ACK
Data
ACK
Data
NACK
/ ACK
STOP
Figure 7. 2-wire Serial Bus Interface Data Format
SDA
t
HD;STA
t
LOW
SCL
t
SU;DAT
t
HD;STA
t
BUF
START
condition
t
HD;DAT
t
HIGH
t
SU;STA
repeated
START
condition
t
SU;STO
STOP
condition
START
condition
Figure 8. 2-wire Serial Bus Interface Timing Chart
Parameter
SCL Clock Frequency
Hold Time for ( Repeated ) START Condition
Low Period of SCL
High Period of SCL
Data Hold Time
Data Setup Time
Setup Time for Repeated Start Condition
Setup Time for STOP Condition
Bus Free Time Between STOP and START Condition
Symbol
f
SCL
t
HD;STA
t
LOW
t
HIGH
t
HD;DAT
t
SU;DAT
t
SU;STA
t
SU;STO
t
BUF
Standard-mode
Min
0
4.0
4.7
4.0
0.1
0.25
4.7
4.0
4.7
Max
100
-
-
-
3.45
-
-
-
-
Fast-mode
Min
0
0.6
1.3
0.6
0.1
0.1
0.6
0.6
1.3
Max
400
-
-
-
0.9
-
-
-
-
Unit
kHz
μs
μs
μs
μs
μs
μs
μs
μs
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/12
TSZ02201-0L5L0F300820-1-2
14.Jul.2016 Rev.002
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
