5 and 6 Channel Capacitive Touch Sensor
Datasheet
1. Register Read Address
updatedtoCurrent SPI Read
Address pointer.
2. Register Read Address
incremented = current address
pointer +1 – end result =
register address pointer doesn’t
change
1. Register Read Address
incremented = current address
pointer + 1
1. Register Read Address
updatedtoCurrent SPI Read
Address pointer
SPI_CS#
SPI_MISO
‘0’
‘1’
‘1’
‘1’
‘1’
‘1’
‘1’
‘1’
‘0’
‘1’
‘1’
‘1’
‘1’
‘1’
‘1’
‘1’
XXh
Read Command – 7Fh
Subsequent Read Commands – 7Fh
Master SPDOUT
SPI_MOSI
Data at previously set register address = current
SPI_CLK
Data at previously set register address = current
address pointer (SPI)
Data at previously set register address = current
address pointer (SPI)
address pointer
Master Drives
Slave Drives
1. Output buffer transmitted=
data at previous address
pointer + 1 = current address
pointer
Register Data loaded into
Output buffer = data at current
address pointer + 1
1. Register data loaded into
output buffer = data at current
address pointer
1. Register data loaded into
output buffer = data at current
address pointer
1. SPI Read Address
Incremented = new current
address pointer
2. Register Read Address
Incremented = current address 1. Output buffer transmitted =
1. Output buffer transmitted =
data at current address pointer
+ 1
2. Flag set to increment SPI
Read Address at end of next 8
clocks
1. Output buffer transmitted =
data at current address pointer
+ 1
2. Flagset toincrement SPI
Read Address at end of next 8
clocks
pointer +1
data at previous register
address pointer + 1 = current
address pointer
Figure 3.6 SPI Read Command - Normal Mode - Full
3.6
BC-Link Interface (CAP1006-2 only)
The BC-Link is a proprietary bus developed to allow communication between a host controller device
to a companion device. This device uses this serial bus to read and write registers and for interrupt
processing. The interface uses a data port concept, where the base interface has an address register,
data register and a control register, defined in the SMSC’s 8051’s SFR space.
Refer to documentation for the BC-Link comptabile host controller for details on how to access the
CAP1006 via the BC-Link Interface.
Revision 1.1 (08-05-09)
SMSC CAP1005 / CAP1006
DATA2S2HEET
SMSC [ SMSC CORPORATION ]
