IMX7DCEC datasheet(19/161 Pages) NXP

19 / 161 page

Modules list

i.MX 7Dual Family of Applications Processors Datasheet, Rev. 7, 09/2023

NXP Semiconductors

3.2

Recommended connections for unused analog interfaces

Table 5 shows the recommended connections for unused analog interfaces.

PCIE_REXT

The impedance calibration process requires connection of reference resistor 4.7 K 1% precision

resistor on PCIE_REXT pad to ground.

USB_OTG1_REXT/USB_O

TG2_REXT

The bias generation and impedance calibration process for the USB OTG PHYs requires

connection of 200  (1% precision) reference resistors on each of the USB_OTG1_REXT and

USB_OTG2_REXT pads to ground.

USB_OTG1_CHD_B

An external pullup resistor with value in range from 10 k to 100 k should be connected

between open-drain output USB_OTG1_CHD_B and supply VDD_USB_OTG1_3P3_IN for 3.3 V

signaling. Optionally, a similarly valued pullup resistor could be connected instead between

USB_OTG1_CHD_B and an unrelated supply up to 1.8 V, but in that case the output is only valid

when both that supply and VDD_USB_OTG1_3P3_IN are powered.

TEMPSENSOR_REXT

External 100 K (1% precision) resistor connection pin

Table 4. JTAG controller interface summary

JTAG

I/O Type

On-chip Termination

JTAG_TCK

Input

47 kpull-up

JTAG_TMS

Input

47 kpull-up

JTAG_TDI

Input

47 kpull-up

JTAG_TDO

3-state output

100 kpull-up

JTAG_TRSTB

Input

47 kpull-up

JTAG_MOD

Input

100 kpull-up

Table 5. Recommended connections for unused analog interfaces

Module

Package Net Name

Recommendation

if Unused

ADC

VDDA_ADC2_1P8, VDDA_ADC2_1P8, VDDA_ADC1_1P8,

VDDA_ADC1_1P8

1.8 V

ADC2_IN3, ADC2_IN2, ADC2_IN1, ADC2_IN0, ADC1_IN0,

ADC1_IN1, ADC1_IN2, ADC1_IN3

Tie to ground

LDO

VDD_1P2_CAP

Floating if USB_HSIC is not used

MIPI

VDD_MIPI_1P0, VDDA_MIPI_1P8

Floating or tie to ground

MIPI_DSI_D0_N, MIPI_DSI_D0_P, MIPI_VREG_0P4V,

MIPI_DSI_CLK_N, MIPI_DSI_CLK_P, MIPI_DSI_D1_N,

MIPI_DSI_D1_P, MIPI_CSI_D0_N, MIPI_CSI_D0_P,

MIPI_CSI_CLK_N, MIPI_CSI_CLK_P, MIPI_CSI_D1_N,

MIPI_CSI_D1_P

No connect

Table 3. Special signal considerations(continued)

Signal Name

Remarks

IMX7DCEC Datasheet(PDF) 19 Page - NXP Semiconductors

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