5 and 6 Channel Capacitive Touch Sensor
Datasheet
VDD
Embedded Controller
CAP1005
Touch
Button
Touch
Button
CS1
CS3
CS5
CS2
CS4
Touch
Button
Touch
Button
Touch
Button
Figure 4.2 System Diagram for CAP1005
4.1
Power States
The CAP1005 / CAP1006 has three operating states depending on the status of the STBY and
DSLEEP bits. When the device transitions between power states, previously detected touches (for
inactive channels) are cleared and the status bits reset.
1. Fully Active - The device is fully active. It is monitoring all active Capacitive Sensor channels.
2. Standby - The device is in a lower power state. It will measure a programmable number of channels
(as determined by the Standby Channel register - default none). Interrupts will still be generated
based on the active channels. The device will still respond to communications normally and can
be returned to the Fully Active state of operation by clearing the STBY bit.
3. Deep Sleep - The device is in its lowest power state. It is not monitoring any Capacitive Sensor
channels. It can be awakened by SMBus or SPI communications targeting the device (which will
cause the DSLEEP bit to be automatically cleared).
APPLICATION NOTE: The CAP1006-2, which communicates using the BC-Link protocol, does not support Deep
Sleep.
Revision 1.1 (08-05-09)
SMSC CAP1005 / CAP1006
DATA2S4HEET
SMSC [ SMSC CORPORATION ]
