IQS550EV03 S Azoteq, IQS550EV03 S Datasheet - Page 17

• Manufacturer Part Number: IQS550EV03 S
• Description: Touch Sensor Development Tools Trackpad Demo for IQS550
• Manufacturer: Azoteq

Specifications of IQS550EV03 S

• Tool Is For Evaluation Of: IQS550
• Interface Type: I2C, SPI
• Operating Voltage: 1.65 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C

5.2 Control Byte
The 7-bit device
Currently the sub-address is fixed at „00‟.
5.3 I
To read from the device a current address
read can be performed.
the address-command is already setup as
desired.
If
specified, then a random read must be
performed. In this case a WRITE is initially
performed to setup the address-command,
and then a repeated start is used to initiate the
READ section.
5.4 I
To write settings to the device a Data Write is
performed.
always required, followed by the relevant data
bytes to write to the device.
Copyright © Azoteq (Pty) Ltd
All Rights Reserved.
Start
Start
Start
S
MSB
S
S
the
Figure 5.2
Adr + WRITE ACK
Control Byte
Adr + WRITE
Control Byte
Control Byte
2
2
Figure 5.1
C Read
C Write
1
Figure 5.3
address-command
Figure 5.4
ACK
I2C Group
1
Here the Address-Command is
ACK
command
Address-
Command
Address-
Current Address Read
1
7 bit address
Current Address Read
DATA WRITE
Data n
ACK
0
ACK
I
address
Random Read
2
Random Read
Start
C Control Byte
S
Data Write
1
Control Byte
ACK
Adr + READ
Data n
This assumes that
Sub-addresses
0
Data n+1
must
ACK
ACK
is
0
Data n+1
ProxSense
„1110100‟.
Data n
R/W
NACK
first
IQ Switch
ACK
NACK
LSB
Stop
S
IQS550 Trackpad Datasheet
Stop
be
Stop
S
S
®
5.5 End of Communication
Similar to other Azoteq I
communication session, an I
given. When sending numerous read and
write commands in one communication cycle,
a repeated start command must be used to
string them together (since a STOP will jump
out of the communication window, which is not
desired).
The STOP ends the communication, RDY
goes LOW, and the device will return to
process a new set of data.
obtained, the communication window will
again become available (RDY set HIGH).
5.6 Address-Command
In the address-commands, the length of the
available data is often relative to the total Rx
and Tx channels configured on the device. To
indicate
commands, the terms TotalTxs and TotalRxs
will be used.
Most of the commands allow the master to
Read/Write certain data. However in normal
operation initially only the XY Data Read is
recommended, since it gives a good summary
of all required data.
commands
setup/configuration, or when needed.
5.6.1 Version Information Read (0x00)
Here device version information can be
obtained.
Project Number (2 bytes), Major Release
Number (1 byte) and Minor Release / Build
Number (1 byte) are available, followed by a
Hardware ID, and Hardware Revision (2 bytes
each). A total of 10 bytes are thus available.
5.6.2 XY Data Read (0x01)
The default address-command at the start of
each communication window is set to the XY
data read address-command.
that if a Current Address Read is performed at
the start of the communications window
without having set the address-command
before this, then the XY Data will be obtained.
Revision 1.04
Series
®
Session / Window
Description
the
A Product Number (2 bytes),
should
length
only
2
of
C devices, to end the
The other address-
these
be
2
Once this is
C STOP is
This means
November 2012
used
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address-
for