NVCC power supply design on i.MX8M

[chao]

Hi everyone,

We are designing the circuit of i.MX8M Mini. If the peripherals in our design are all 3.3V interfaces, should the NVCC power pins (such as NVCC_JTAG/NVCC_NAND/NVCC_I2C/NVCC_GPIO1/NVCC_ECSPI/NVCC_SAI2) be connected to 3.3V?

[chao]

Hi igor,

thank you reply again,

The following table lists the NVCC pins used in the reference design file. Some pins are connected to 1.8V, while others are connected to 3.3V. If our peripherals are all 3.3V interfaces. Do these pins whice connected to 1.8V need change to 3.3V?

Pin Number	PIN NAME	Voltage used in reference Design Files
L19	NVCC_JTAG	1.8V
U19	NVCC_NAND	3.3V
W18	NVCC_SAI1	3.3V
V19	NVCC_SAI2	1.8V
Y10	NVCC_SAI3	3.3V
W17	NVCC_SAI5	3.3V
W12	NVCC_GPIO1	1.8V
J11	NVCC_I2C	1.8V
J12	NVCC_UART	1.8V
H10	NVCC_ECSPI	3.3V
W22	NVCC_ENET	1.8V
V20	NVCC_SD1	1.8V
V22	NVCC_SD2	1.8V
M19	NVCC_CLK	1.8V

[igorpadykov]

Hi liaochao

one needs to follow pad powering described in Table 85. i.MX 8M Dual / 8M QuadLite / 8M Quad 17 x 17 mm functional contact assignments, column "Power Group"

i.MX 8M Dual / 8M QuadLite / 8M Quad Applications Processors Data Sheet for Consumer Products

So first you should find which pad used in the case, then using that table find power "NVCC***" for it.

Best regards
igor