IMX93CEC datasheet(11/123 Pages) NXP

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Table 3. Special signal considerations

Signal Name

Remarks

CLKIN1/CLKIN2

CLKIN1 and CLKIN2 are input pins without internal pull-up and pull-down. An external 10K

pull-down resistor is recommended if they are not used.

These signals are No Connect (NC) and should be unconnected in the application.

ONOFF

A brief connection to GND in the OFF mode causes the internal power management state machine

to change the state to ON. In the ON mode, a brief connection to GND generates an interrupt

(intended to be a software-controllable power-down). A connection to GND for a period of time

longer than the value configured in the BBNSM_CTRL[BTN_TIMEOUT] causes a forced OFF

(PMIC_ON_REQ output “L”), as long as there is no pending RTC alarm event or tamper event.

POR_B

POR_B has no internal pull-up/down resistor, and requires external pull-up resistor

to NVCC_BBSM_1P8.

It is recommended that POR_B is properly handled during power up/down. Please see the EVK

design for details.

RTC_XTALI/RTC_XTALO To hit the exact oscillation frequency, the board capacitors must be reduced to account for the board

and chip parasitics. The integrated oscillation amplifier is self-biasing, but relatively weak. Care

must be taken to limit the parasitic leakage from RTC_XTALI and RTC_XTALO to either the power

or the ground (> 100 MΩ). This de-biases the amplifier and reduces the start-up margin.

If you want to feed an external low-frequency clock into RTC_XTALI, the RTC_XTALO pin must

remain unconnected or driven by a complementary signal. The logic level of this forcing clock

must not exceed the NVCC_BBSM_1P8 level and the frequency shall be < 50 kHz under the

typical conditions.

XTALI_24M/XTALO_24M The system requires 24 MHz on XTALI/XTALO. The crystal cannot be eliminated by an external 24

MHz oscillator.

If this clock is used as a reference for USB, then there are strict frequency tolerance and jitter

requirements. See Clock sources and relevant interface specifications chapters for details.

3.1 Unused input and output guidance

If a function of the i.MX 93 is not used, the I/Os and power rails of that function can be terminated to reduce overall board power.

Table 4 is recommended connectivities for LVDS and other digital I/Os. Table 5 is recommended connectivities for MIPI. Table 6

is recommended connectivities for USB.

Table 4. Unused function strapping recommendations

Function

Ball name

Recommendations

if unused

ADC

ADC_IN0, ADC_IN1, ADC_IN2, ADC_IN3

Tie to ground

TAMPER TAMPER0, TAMPER1

Tie to ground

LVDS

LVDS_CLK_P, LVDS_CLK_N, LVDS_Dx_P, LVDS_Dx_N

Not connected

Table continues on the next page...

NXP Semiconductors

IMX93CEC

i.MX 93 Applications Processors Data Sheet for Commercial Products

IMX93CEC

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 7 — 12 February 2026

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