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AFE4490SPO2EVM: SPI communication in AFE4490SPO2EVM_Board.

Part Number: AFE4490SPO2EVM
Other Parts Discussed in Thread: AFE4490

SPI communication in AFE4490SPO2EVM_Board.

Purpose: To confirm that AFE4490 can be controlled using SPI communication of MCP2210. The specific method is to add some current to LED2 and check that it shines visually.

Remove the 10Ω resistor in EVM_Board and connect the MCP2210 signal to AFE4490 terminal in described below via 10Ω.

And I connected the optical sensor (DS-100A) to the D-sub 9pin connector.

SPI_Master device is MCP2210 (MicroChip), OUTPUT voltage is set to 3.3V.

The AFE4490EVM supplies only 5V from the USB connector.

The connection is as follows.


AFE4490SPO2EVM          MCP2210

AFE_RESETZ                   GP1

ADC_RDY                         GP2

PD-ALM                             GP3

LED_ALM                          GP4

DIAG_END                        GP5

AFE_PDNZ                       GP6

SPI_STE                           GP0

SPI_SIMO                         MOSI

SPI_SOMI                         MISO

SPI_CLK                           SCK

XIN_MSP                          No connect

CLK_OUT                         No connect


MCP2210 settings and wa veform confirmation details:

After setting MCP2210 to SPI communication mode, LEDCNTRL (address_0x22) is set to 0x02, 0x01, 0xFF.

Send 3 bytes of data. The waveform is Data01.

Data01 signal description: The checkpoint is the AFE4490 terminal. Yellow is SPI_STE, green is SPI_CLK, and blue is SPI_SIMO.


Result: LED2 does not illuminate.


Please tell me the setting to make LED2 shine. Or, please tell me how to confirm that SPI communication is possible by other methods.