qf4a512 ETC-unknow, qf4a512 Datasheet - Page 13

• Manufacturer Part Number: qf4a512
• Description: 4-channel Programmable Signal Converter Psc
• Manufacturer: ETC-unknow

Within EEPROM, 128 bytes of user space are provided for storing application-specific information. This data could include, for example,
Transducer Electronic Data Sheets (TEDS, IEEE P1451.4).
The full 14-bit address space can be accessed via the SPI interface in the "Configure" mode. In the "Run" mode only 8-bits of address
space can be accessed, which include the command registers and other general configuration registers.
4. SOFTWARE
4.1 Device Configuration
Before useful data can be output from the QF4A512 it must first be correctly configured. Configuration parameters include the following:
4.2 Quickfilter Development Kit (QF4A512-DK)
The Development Kit is a complete hardware and software combination which allows for rapid development of the QF4A512
configuration parameters for a specific application.
The Quickfilter Pro Design Software tool allows all the necessary parameters to be generated in a quick and user-friendly manner. The
user enters the desired characteristics (e.g. sampling rates, type of filter, cut-off frequencies etc.) for each channel and the software
generates a configuration file for the device. The configuration file can be immediately downloaded into the QF4A512 on the
development board, and the actual hardware device performance can be monitored - either in response to a PC-generated noise
source or to a user-applied signal. Device configuration parameters can be further adjusted, if necessary, until the optimum system
performance is reached.
Once satisfied with the performance the configuration file can be saved for future use, for example to program devices in bulk prior to
volume board manufacturing.
4.3 In-circuit (Re)configuration
The Quickfilter Pro Design Software is the recommended method to derive the configuration data for the device. However, it may
sometimes be desired to verify the configuration written to the device. Or, in certain applications, it may be desired to re-configure the
device in circuit from a host MCU, for example to switch channels on/off, change gain values etc. Therefore, more detailed descriptions
of device operation and descriptions of various register settings etc. can be found in sections 5 – 12. For most applications the
software alone will be sufficient to provide optimum device performance and reference to these sections will be unnecessary.
Rev C5, Jan 07
1.
2.
3.
4.
5.
6.
7.
Startup mode. Options include copying configuration parameters and filter coefficients from EEPROM and then immediately
running or waiting for an external command.
Number of channels to be active.
Gain of the PGA for each input channel.
Cutoff frequency of the anti-aliasing filter for each channel.
Analog to digital converter sampling rate and decimation/down conversion rate for each channel.
FIR filter coefficients.
Output data format.
PRELIMINARY
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QF4A512