CAP1006 datasheet(22/53 Pages) SMSC

22 / 53 page

5 and 6 Channel Capacitive Touch Sensor

Datasheet

Revision 1.1 (08-05-09)

SMSC CAP1005 / CAP1006

DATASHEET

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.

Figure 3.6 SPI Read Command - Normal Mode - Full

Master SPDOUT

SPI_MOSI

Master Drives

Slave Drives

SPI_CLK

Read Command – 7Fh

SPI_CS#

Data at previously set register address = current

address pointer

SPI_MISO

‘0’

‘1’

Data at previously set register address = current

address pointer (SPI)

XXh

1. Register Read Address

updated to Current SPI Read

Address pointer

1. Register data loaded into

output buffer = data at current

address pointer

1. Output buffer transmitted =

data at previous address

pointer + 1 = current address

pointer

1. Register Read Address

incremented = current address

pointer + 1

1. SPI Read Address

Incremented = new current

address pointer

2. Register Read Address

Incremented = current address

pointer +1

Output buffer = data at current

address pointer + 1

1. Output buffer transmitted =

data at current address pointer

+ 1

2. Flag set to increment SPI

Read Address at end of next 8

clocks

‘0’

‘1’

Data at previously set register address = current

address pointer (SPI)

1. Register data loaded into

output buffer = data at current

address pointer

1. Output buffer transmitted =

data at previous register

address pointer + 1 = current

address pointer

1. Output buffer transmitted =

data at current address pointer

+ 1

2. Flag set to increment SPI

Read Address at end of next 8

clocks

Subsequent Read Commands – 7Fh

1. Register Read Address

updated to Current SPI Read

Address pointer.

2. Register Read Address

incremented = current address

pointer +1 – end result =

change

CAP1006 Datasheet(PDF) 22 Page - SMSC Corporation

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