A development board is necessary for power and communication connections, as well as for providing a backup battery for the CF2 real time clock and to demonstrate the <10uA suspend mode. Persistor's development boards also provide some through-hole breadboarding areas for prototyping circuits and a connector for connecting to analog inputs.
Shown Above: R212
The R212 is the simplest development board for the CF2.
A MAX146 is installed to provide 8 channels of 12bit analog to digital conversion. The MAX146 is an SPI device and the CF2 A-D examples show how to communicate with it on Persistor's QPB (Queued PicoBUS), turn it off and manage the CF2 at 1mA idle, read channels one at a time or as a block, burst read at 80,000 samples per second, sample slowly with attention to power, and finally how to write buffered data to a file on the CompactFlash memory card.
The MAX146 is also compatible with PicoDAQ, a ready to run, configurable A/D logging program.3" X 5" base board style
Shown Above: R216AU
The R216AU is built from the same circuit board as the R212 but instead of the MAX146, a Texas Instruments (Burr Brown) ADS8344 16 bit A/D is installed. The same A-D examples are used and a different compile of PicoDAQ works with it.
The ADS8344 is also the necessary A/D for running the SPIIIDAQ foreground function, which is a highly optimized piece of code that permits the CF2 to continuously stream up to 64,000 samples per second to CompactFlash (Max 2GB per file).
AU stands for Auxiliary UARTs. The CF2's 14 TPU ports can be easily configured as independent UART channels and the R216AU has an RS232 driver and 3.5mm jacks installed to simplify the use of four TPU ports as two pairs of auxiliary UARTs. A suite of examples demonstrate configuring the TPU UARTs, replacing the SCI console, and daisy chaining the UARTs3" X 5" base board style
MRCP (V1, V2 or V3)
Shown Above: MRCP-V3
The MRCP is optimized for deploying the CF2 in a tube. There are three versions available.
V1 uses custom low profile, high retention, machine screw connectors for the smallest possible deployment. The MRCP-V1 and CF2 without a CompactFlash card will fit in a 1.75" tube. With a CompactFlash card, the set will fit inside a 2.35" tube. The connectors are stackable but can be clipped off if stacking is not desired. Because the V1 connectors are delicate, and nearly impossible to disconnect from the CF2, we recommend V2 or V3 unless the minimum height is necessary.
V2 and V3 use robust Samtec connectors that match the CF2 0.025" square pins with gold contacts. This option is easier to handle and less expensive but adds about 1/16" to the height of the CF2/MRCP stack. V2 uses stacking connectors and V3 uses non-stacking connectors.
All versions of the MRCP use the 8 channel 16 bit ADS8344 compatible with the A-D examples, PicoDAQ and SPIIIDAQ.
The CF2's spare RS232 driver is used to present one pair of TPU channels for use as an auxiliary UART pair.1.375" X 6"