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CY8C20140 Datasheet(PDF) 7 Page - Cypress Semiconductor

Part # CY8C20140
Description  CapSense짰 Express??Button Capacitive Controllers
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Manufacturer  CYPRESS [Cypress Semiconductor]
Direct Link  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

CY8C20140 Datasheet(HTML) 7 Page - Cypress Semiconductor

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CY8C20110, CY8C20180
CY8C20160, CY8C20140
CY8C20142
Document Number: 001-54606 Rev. *J
Page 7 of 46
Figure 6. Circuit 3 – Compatibility with 1.8 V I2C Signaling [8, 9]
Figure 7. Circuit 4 – Powering Down CapSense Express Device for Low Power Requirements [10]
Typical Circuits (continued)
Master
Or
Host
LDO
CapSense Express
I2C Pull
UPs
LED
I2C
BUS
SDA
SCL
VDD
Output
Output
enable
Notes
8. 1.8 V
 VDD_I2C  VDD_CE and 2.4 V  VDD_CE  5.25 V.
9. The I2C drive mode of the CapSense device should be configured properly before using in an I2C environment with external pull-ups. Please refer to I2C_ADDR_DM
register and its factory setting.
10. For low power requirements, if VDD is to be turned off, this concept can be used. The requirement is that the VDDs of CapSense Express, I2C pull-ups, and LEDs
should be from the same source such that 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 of the master can cater to the power supply requirements of the circuit, the LDO can be
avoided.


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