CY8C20180_09 CYPRESS [Cypress Semiconductor], CY8C20180_09 Datasheet - Page 6

• Manufacturer Part Number: CY8C20180_09
• Description: CapSense Express-8 Configurable IOs
• Manufacturer: CYPRESS [Cypress Semiconductor]

Modes of Operation
CapSense Express devices are configured to operate in any of
the following three modes to meet different power consumption
requirements:
■
■
■
Active Mode
In the active mode, all the device blocks including the CapSense
sub system are powered. Typical active current consumption of
the device across the operating voltage range is 1.5 mA.
Sleep Mode
Sleep mode provides an intermediate power operation mode. It
is enabled by configuring the corresponding device register.
When enabled, the device enters sleep mode and wakes up after
a specified sleep interval. It scans the capacitive sensors before
going back to sleep again. The device can also wake up from
sleep mode with a GPIO interrupt. The following sleep intervals
are supported in CapSense Express. The sleep interval is
configured through registers.
■
■
■
■
Document Number: 001-17346 Rev. *F
Active Mode
Sleep Mode
Deep Sleep Mode
1.95 ms (512 Hz)
15.6 ms (64 Hz)
125 ms (8 Hz)
1s (1 Hz)
Deep Sleep Mode
Deep sleep mode provides the lowest power consumption
because there is no operation running. In this mode, the device
is woken up only using an external GPIO interrupt. A sleep timer
interrupt cannot wake up a device from deep sleep mode. This
can be treated as a continuous sleep mode without periodic
wakeups. Refer to the application note
Power and Sleep Considerations - AN44209”
different sleep modes.
Bi-Directional Sleep Control Pin
The CY8C20180 requires a dedicated sleep control pin to allow
reliable I
This is achieved by pulling the sleep control pin LOW to wake up
the device and start I
can be configured on any of the GPIO. If sleep control feature is
enabled, the device has one less GPIO available for CapSense
and GPIO functions. The sleep control pin can also be
configured as interrupt output pin from CY8C20180 to the host
to acknowledge finger press on any button. To enable bi-direc-
tional feature, user must use I2C-USB bridge program.
2
C communication in case any sleep mode is enabled.
2
C communication. The sleep control pin
“CapSense Express
CY8C20180
for details on
Page 6 of 16
[+] Feedback