Emg 2009

• BiomechDocs BL Knee PFresearchE
• Biomech Documentation links:
• AKCPU2z BLMD6c BLFT6c PSER1c Imu_2010 Emg_2009 Ric Upd_pcb

• kknee1 knee2 P32_paper_project Pic32

• Wireless Radio (WIP2b)

• Microchip Tools For Coding, Programming

• Using the Powerfoot (Pf_users)

• Biomech Manual

Edit

PIC32 firmware

• source code location [1]
• Use the project p32_emg.mcp

issues

• ISP UART and SPI are shared. Need to move ISP UART to different port.
• this sharing also means that the MISO pin can be also driven by the ISP UART Tx signal. This appears to over drive the MISO signal - meaning that it is lost.

dsPIC firmware

dsPIC firmware development:

• Use the workspace:

https://svn.media.mit.edu/r/biomech/trunk/prostheticsteam/code/cbarn/trunk/dspic_shared/hal_dev/hal_dev.mcw

• and select the project:

https://svn.media.mit.edu/r/biomech/trunk/prostheticsteam/code/cbarn/trunk/dspic_shared/hal_dev/test_ads1258.mcp

• will migrate to Pic32. For details of its use P32_paper_project

spiemg1 SCH/PCB

• 8 channel PRE-AMP style EMG amplifier with SPI interface
• SCH [2]
• SCH for 3.3V switcher : [3]
• SCH for 5.4V switcher : [4]

• PCB TOP SIDE [5]
• PCB BOT SIDE [6]
• BOM [7]
• BOM text [8]

• ADS1258 PDF 24bit, 16 ch, 2 supplies

assembly instructions

• Start by assembling the 3.3V switching regulator and then testing it by verifying 3.3V at TP7. This module has reference designator in the 80s and physical reside in a tight location of the top side of the PCB.

• To power the 3.3V switcher you'll need to apply ~5V to V.PROT from a ~100mA current limited supply. A successful test is the output of 3.3V, with nothing getting hot. To apply power, you may wish to install P1, F1, and D1 and use one of my power pole to 1.25mm adapters.

• Next assemble the 5.4V switcher (refdes 90s) and test with ~7V. Verify ~5.4V at TP6.
• Assemble the -5V switcher (UN1 and support components) and test with ~7V. Verify ~-5V at TP10
• Assemble the +- 2.5V linear regulators (UA1, UA2, and support). Verify +-2.5V at TP8 and TP12.
• Assemble the ADC voltage reference (UR1, UR2 and support). For UR2 use REF3312 in the kit. Verify at TP18 that you see -1.3V WRT to GND, or 1.2V WRT to the -2.5V.
• At this point, it should be safe to assemble the primary IC US1 and the remainder of the PCB.

paconn1 SCH/PCB

• 8 channel PRE-AMP connector PCA
• SCH [9]
• PCB TOP SIDE [10]
• PCB BOT SIDE [11]
• BOM [12]
• BOM text [13]

known issues

• silk screen for PACONN1 doesnt show connector orientation
• V.FUSED net isn't driven on EMG
• Pin 1 of the 2x10 connectors is on the right side.

previous

EMG09