BU21050FS-E2 Rohm Semiconductor, BU21050FS-E2 Datasheet - Page 3

• Manufacturer Part Number: BU21050FS-E2
• Description: IC CAP SENSOR SWITCH 8CH 32-SSOP
• Manufacturer: Rohm Semiconductor
• Type: Capacitive Switchr

Specifications of BU21050FS-E2

• Package / Case: 32-SSOP
• Input Type: Logic
• Output Type: Logic
• Interface: Port
• Current - Supply: 550µA
• Mounting Type: Surface Mount
• Supply Current: 550µA
• Supply Voltage Range: 4.5V To 5.5V
• Sensor Case Style: SSOP
• No. Of Pins: 32
• Operating Temperature Range: -40°C To +85°C
• Svhc: No SVHC (18-Jun-2010)
• Base: RoHS Compliant
• Supply Voltage: 5 V
• Dimensions: 13.6 mm L x 7.8 mm W x 1.8 mm H
• Power Dissipation: 760 mW
• Temperature Range: - 55 C to + 125 C
• Termination Style: SMD/SMT
• Base Number: 21050
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: BU21050FS-E2TR

●Block Diagram, Pin configuration
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BU21050FS
www.rohm.com
・Sensor I/F CV Conversion Circuit
・AD Conversion
・Conversion Sequence Control
・Noise Filter
・Compare threshold
・Interface Selection
・Calibration
・Reset Generation
・Clock Generation
This part selects target sensor and converts its capacitance to a voltage signal. Specifically, all eight sensors are selected
one-by-one and their capacity is compared to a common referencecapacity. Each difference value is converted to a certain
voltage signal.
The voltage signal derived from CV conversion is further converted to digital value by this block.
This block controls the process of CV conversion and generates timing of selecting target sensors.
The GND level difference between appliance and human body will cause noises to the CVconversion circuit.
This block eliminates these noises.
By setting this block, output mode can be set to either 8-bit PIO mode or 4-bit binary mode.
When the capacitance change do not exceed the threshold for a certain period, this block
tarts-up calibration process.
This is internal reset circuit. Reset is initialized by external SDN signal.
Clock from internal RC oscillation circuit is used as system clock.
CV converted to sensor data On / Off compared with a threshold, the switch converts the signal.
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Technical Note
2009.04 - Rev.B