CAP1006 datasheet(21/53 Pages) SMSC

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5 and 6 Channel Capacitive Touch Sensor

Datasheet

SMSC CAP1005 / CAP1006

Revision 1.1 (08-05-09)

DATASHEET

3.5.4

Read Data

The Read Data protocol is used to read data from the device. During the normal mode of operation,

while the device is receiving data, the CAP1005 is simultaneously transmitting data to the host. For

the Set Address commands and the Write Data commands, this data may be invalid and it is

recommended that the Read Data command is used.

Figure 3.4 SPI Write Command - Normal Mode

Figure 3.5 SPI Read Command - Normal Mode

Master SPDOUT

SPI_MOSI

Data to Write

SPI_CS#

SPI_CLK

Write Command – 7Eh

Unknown, Invalid Data

Old Data at Current Address Pointer

SPI_MISO

Master Drives

Slave Drives

1. Data written at current

address pointer

2. Address pointer incremented

Master SPDOUT

SPI_MOSI

Master Drives

Slave Drives

SPI_CLK

First Read Command – 7Fh

SPI_CS#

Invalid, Unknown Data *

SPI_MISO

‘0’

‘1’

Subsequent Read

Commands – 7F

Data at Current Address Pointer

Address Pointer

Incremented **

‘0’

‘1’

* The first read command after any other command will return invalid data for the first

byte. Subsequent read commands will return the data at the Current Address Pointer

** The Address Pointer is incremented 8 clocks after the Read Command has been

received. Therefore continually sending Read Commands will result in each command

reporting new data. Once Read Commands have been finished, the last data byte will be

read during the next 8 clocks for any command

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