CY8C20111 View Datasheet(PDF) - Cypress Semiconductor

Part Name

Description

MFG CO.

CY8C20111

CapSense® Express™ – One Button and Two Button Capacitive Controllers

Cypress Semiconductor 

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CY8C20111, CY8C20121

Typical Circuits (continued)

Figure 7. Circuit-5: Powering Down CapSense Express Device for Low Power Requirements [4]

Output

enable

LDO

Output

VDD

LED

I2C Pull

UPs

Master

Or

Host

CapSense Express SDA

SCL

I2C

BUS

Note

4. For low power requirements, if VDD is to be turned off, the above concept can be used. The VDDs of CapSense Express, I2C pull-ups, and LEDs must be from the

same source. Turning off the VDD ensures that no signal is applied to the device while it is unpowered. The I2C signals should not be driven high by the master in

this situation. If a port pin or group of port pins can cater to the power supply requirement of the circuit, the LDO can be avoided.

Document Number: 001-53516 Rev. *H

Page 7 of 44

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