Figure 2. DC/DC function diagram
The processor's on-chip DC-DC regulator is suitable for consumer and industrial applications up to 105 degrees
C. For automotive applications, contact your NXP representative.
NOTE
4 Clocks
See
for the clock configuration. The 32.768-kHz and 24-MHz oscillators are used for the EVK design. For RT1170, it is
necessary to use 32.768-kHz and 24-MHz crystals for the hardware design.
Table 4. Clocks’ configurations
Signal name
Recommended connections
Description
1.RTC_XTALI/RTC_XTALO
For the precision 32.768-kHz oscillator,
connect a crystal between RTC_XTALI
and RTC_XTALO. Choose a crystal with
a maximum ESR (Equivalent Series
Resistance) of 100 k and follow the
manufacturer’s recommendation for the
loading capacitance. Do not use an
external biasing resistor because the bias
circuit is on the chip.
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 M). This
de-biases the amplifier and reduces the
start-up margin.
For the external kHz source (if feeding
an external clock into the device),
RTC_XTALI can be driven DC-coupled
with RTC_XTALO floating or driven by a
complimentary signal.
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
Table continues on the next page...
NXP Semiconductors
Clocks
Hardware Development Guide for the MIMXRT1160/1170 Processor , Rev. 2, 09/2021
User Guide
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