BU21077MUV Datasheet, PDF (3/16 Pages) Rohm – Capacitive Switch Controller IC

BU21077MUV
Block Diagram
VDD
RSTB
TEST
SDA
SCL
VREF
LDO15
OSC
LOGIC
MPU
AFE
Control
PRAM
WRAM
WDTR
HOST I/F
LDO25
POR
AVDD
DVDD
A/D
Converter
AFE
C/V
Converter
Sensor
AFE
SIN*
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.
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TSZ22111・15・001
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TSZ02201-0L5L0F300820-1-2
14.Jul.2016 Rev.002