6 Channel Capacitive Touch Sensor with 2 LED Drivers
Datasheet
SPI_CS#
SPI_CLK
‘0’
‘1’
‘1’
‘1’
‘1’
‘0’
‘1’
‘0’
‘0’
‘1’
‘1’
‘1’
‘1’
‘0’
‘1’
‘0’
Master SPDOUT
SPI_MOSI
Reset - 7Ah
Reset - 7Ah
Invalid register data
00h – Internal Data buffer empty
SPI_MISO
Master Drives
Slave Drives
Figure 3.2 SPI Reset Interface Command - Normal Mode
3.5.2
Set Address Pointer
The Set Address Pointer command sets the Address pointer for subsequent reads and writes of data.
The pointer is set on the rising edge of the final data bit. At the same time, the data that is to be read
is fetched and loaded into the internal output buffer but is not transmitted.
SPI_CS#
SPI_CLK
Master SPDOUT
SPI_MOSI
Register Address
‘0’
‘1’
‘1’
‘1’
‘1’
‘1’
‘0’
‘1’
Set Address Pointer – 7Dh
Unknown, Invalid Data
Unknown, Invalid Data
SPI_MISO
Master Drives
Address pointer set
Slave Drives
Figure 3.3 SPI Set Address Pointer Command - Normal Mode
3.5.3
Write Data
The Write Data protocol updates the contents of the register referenced by the address pointer. As the
command is processed, the data to be read is fetched and loaded into the internal output buffer but
not transmitted. Then, the register is updated with the data to be written. Finally, the address pointer
is incremented.
Revision 1.1 (08-05-09)
SMSC CAP1026
DATA2S2HEET
SMSC [ SMSC CORPORATION ]
