TIDUF25 june 2023 ADS131M08 , MSPM0G1507
The MSPM0+ MCU and ADS131M08 portion of this design is powered from a single voltage rail (DVCC), which is by connecting a 3.3-V external power supply at the DVCC header J13.P1 and J13.P13 or J13.P14 (GND).
Various jumper headers and jumper settings are present to add to the flexibility to the board. Some of these headers require that jumpers be placed appropriately for the board to correctly function. Table 4-1 indicates the functionality of each jumper on the board.
HEADER OR HEADER OPTION NAME | TYPE | MAIN FUNCTIONALITY | VALID USE-CASE | COMMENTS |
---|---|---|---|---|
J1, J2, J3 | 2-pin terminal blocks | Phases A, B, and C voltages (WARNING) | Voltage inputs for line A, B, and C | Each of these terminal blocks connect with one terminal to the Neutral voltage, while the second terminal is wired to either phase A, B, and C respectively. |
J4, J5, J6 | 3-pin terminal blocks | Connect CT (Current Transformers) for line A, B, and C (WARNING) | Current inputs after the CT sensors for line A, B, and C | This terminal block is a three-position terminal block but only the leftmost and rightmost positions are used. The center position, which is connected to GND, is not connected to the CT. Before performing any test, verify that this terminal block is securely connected to both output leads of the CT. |
J7 | 2-pin header | Active energy pulses (WARNING) | Probe here for cumulative active energy pulses. This header has two pins: GND and ACT, which is where the active energy pulses are actually output. | This header is not isolated from AC mains, so do not connect measuring equipment here. See the "ISO_ACT" pin of J14 instead, which is isolated. If testing the active power pulses is desired, use the "ISO_ACT" pin of J14 instead since is isolated. |
J8 | 4-pin header | Reactive energy pulses (WARNING) | Probe here for cumulative reactive energy pulses. This header has two pins: GND and REACT, which is where the reactive energy pulses are actually output. | This header is not isolated from AC mains, so do not connect measuring equipment here. If testing the reactive power pulses is desired, use the "ISO_REACT" pin of J14 instead since it is isolated. |
J9 | 10-pin, 2-row connector | Neutral Connection (WARNING) | Connect the XDS110 Debug Probe to this connector to power the MSPM0G3507 MCU. | The XDS110 Debug Probe is used to program the MSPM0G3507 device. Note that the MSPM0 MCU has to be powered externally to program it. Since this header and the XDS110 are not isolated, do not connect to this header when running off Mains and Mains is not isolated. |
J10 | 6-pin header | FTDI UART to USB header (WARNING) | Use FTDI cable and UART link while debugging with no Mains connected. | Provides UART link through a PC USB port. Since this header is not isolated, do not connect to this header when running off Mains and Mains is not isolated. |
J11 | 8-pin header | ADS131M08 MSPM0G3507 communication header (WARNING) | Probe here for connections to the 4-wire SPI signals, RST signal, CLKIN signal, and DRDY signal of the ADS131M08 device. | The RST pin resets the ADS131M08. When initializing the ADS131M08, the MSPM0G3507 drives this pin to reset the ADS131M08. The DRDY pin of the ADS131M08 device is used to alert the MSPM0+ MCU that new current samples are available. The CLKIN pin is fed from the CLK_OUT clock output of the MSPM0+ MCU to the ADS131M08 device, which divides the clock down to produce the used modulator clock. (WARNING)This header is NOT isolated from AC mains, so do NOT connect measuring equipment when running from Mains unless isolators external to the reference design are available. The pin mappings on this header are as follows: ● Pin 1: ADS131M08 CLKIN pin ● Pin 2: SPI DIN, ADS131M08 DOUT/ pin POCI ● Pin 3: SPI DOUT, ADS131M08 DIN pin/PICO ● Pin 4: SPI CLK (ADS131M08 SCLK pin) ● Pin 5: ADS131M08 DRDY pin ● Pin 6: ADS131M08 CS pin ● Pin 7: ADS131M08 SYNC/ RESET pin). Pin 8: NC |
J12 | 4-pin terminal block | Isolated RS-485 connection | To view the GUI using RS-485, connect the USB to RS-485 adapter here. 5 V must be provided externally on pin 3 of this header. Pin 4 is the RS-485 ground, pin 2 is the B bus I/O line, and pin 1 is the A bus I/O line. | |
J13 | 14-pin 2-row header | Application connector (WARNING) | Probe here for various non-isolated signals. | Provides access to another UART link and ACT and REACT lines. Since this header is not isolated, do not connect to this header when running off Mains and Mains is not isolated. |
J14 | 4-pin header | Isolated pulses header | Probe here for the isolated cumulative active energy pulses and the isolated cumulative three-phase reactive energy pulses. | This header has four pins: GND_ISO, REACT_ISO, ACT_ISO, and DVDD_ISO. GND_ISO is the isolated ground for the energy pulses. DVDD_ISO is the VDD connection for the isolated active and reactive energy pulses. ACT_ISO is where the isolated active energy pulses are output. REACT_ISO is where the isolated reactive energy pulses are output. This header is isolated from AC mains so it is safe to connect to a scope or other measuring equipment because isolators are already present. However, either 3.3 V or 5 V must be applied between GND_ISO and DVDD_ISO to produce both the active and the reactive energy pulses at this header. The produced pulses have a logical high voltage that is equal to the voltage applied between GND_ISO and DVDD_ISO. |
J15 | 3-pin terminal block | Neutral Connection (WARNING) | Current input after the CT for Neutral line (if Neutral current monitoring is desired). | This terminal block is a three-position terminal block but only the leftmost and rightmost positions are used. The center position, which is connected to GND, is not connected to the CT. Before performing any test, verify that this terminal block is securely connected to both output leads of the CT. |
J17 | 6-pin header | GPIO lines from MSPM0G3507 | Access to 6 unused GPIOs | Connect to 6 GPIOs for experimenting and debugging |
S2 | 12-pin dual switch | RS-232 or RS-485 serial Interface selection switch | Set S2 to either the left or right position to select if serial interface RS-232 or RS-485 is used. Both Interfaces are isolated through the U5 (ISO6731). | The PCB silkscreen marking indicates the position for RS-232 and RS-485. |
JP1 | 3-pin jumper header | Reset selection | Place a jumper at either 1-2 or 2-3 positions depending on which RESET line is active. TVS3840 and Push Button S1 are used in Position 1-2, otherwise in 2-3 the nRST_debug line from J9 (ARM debug connector) is active. | Useful during board debugging and code development |
JP2 | 3-pin jumper header | Pullup or Pulldown for BSL_invoke line on MSPM0G3507 | Place a jumper at either 1-2 or 2-3 positions depending on if BSL_INVOKE is VDD_3V3 or GND respectively. | Was used on 1st silicon revision, not needed anymore. |