Cypress CapSense CY8CMBR2044, Design Manual

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Introduction
AN66308 - CY8CMBR2044 CapSense® Design Guide, Doc. No. 001-66308 Rev. *F 8

Wide parasitic capacitance C
P
range ( 5 pF
– 40 pF)

System Diagnostics of CapSense buttons
– reports any faults at device power-up

Button shorted to Ground

Button shorted to V
DD

Button to button short

Improper value of modulator capacitor (C
MOD
)

Parasitic capacitance (C
P
) out of range

Advanced features

Toggle ON/OFF feature on GPOs

Flanking Sensor Suppression (FSS) provides robust sensing even with closely spaced buttons

Configurable LED ON Time after button release

Button output reset if touched for excessive time

User-controlled Button Scan Rate

Serial Debug Data output
o
Simplifies production line testing and system debug

Wider operating voltage range

1.71 V to 5.5 V
– ideal for both regulated and unregulated battery applications

Low power consumption

Supply current in run mode as low as 15 µA
a
per button

Deep Sleep current: 100 nA

Industrial temperature range:
–40 ºC to + 85 ºC

16-pad Quad Flat No leads (QFN) package (3 mm x 3 mm x 0.6 mm)
a
Power consumption calculated with 1.7% touch time, 500 ms Button Scan Rate, Cp of each button < 19 pF