RT600 datasheet(144/171 Pages) NXP

144 / 171 page

RT600

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Product data sheet

Rev. 2.1 — 7 July 2023

144 of 173

NXP Semiconductors

RT600

Dual-core microcontroller with 32-bit Cortex-M33 and Xtensa HiFi4

Audio DSP CPUs

CSTRAY – stray capacitance between XTALIN and XTALOUT pins.

For example:

CL = 9pF

Cx = Cy = 2CL - CPad - 2CSTRAY

Cx = Cy = 2*9 - 3 - 0 = 15 pF

Although CSTRAY can be ignored in general, the actual board layout and placement of

external components influences the optimal values of external load capacitors. Therefore,

it is recommended to fine tune the values of external load capacitors on actual hardware

board to get the accurate clock frequency. For fine tuning, measure the clock on the

CLKOUT pin and optimize the values of external load capacitors for minimum frequency

deviation.

To use bypass mode on system oscillator, set bit 1 to ‘1’ in the system oscillator control 0

(CLKCTL0_SYSOSCCTL0), float the XTALOUT pin, and drive XTALIN with a 0.8 V to

1.8V square wave.

For oscillator high gain mode, a larger voltage swing is used at the crystal pin. This gives

a higher noise immunity within the oscillator and less edge to edge jitter of the internal

clock. If high gain mode is not required, power used by the crystal oscillator can be

reduced by using low power mode.

Remark: High gain mode requires a 1 megohm resistor (RF) to be inserted.

16.5.1 XTAL Printed Circuit Board (PCB) design guidelines

• Connect the crystal and external load capacitors on the PCB as close as possible to

the oscillator input and output pins of the chip.

• The length of traces in the oscillation circuit should be as short as possible and must

not cross other signal lines.

• Ensure that the load capacitors Cx and Cy have a common ground plane.

• Loops must be made as small as possible to minimize the noise coupled in through

the PCB and to keep the parasitics as small as possible.

• Lay out the ground (GND) pattern under crystal unit.

• Do not lay out other signal lines under crystal unit for multi-layered PCB.

16.6 Suggested USB interface solutions

The USB device can be connected to the USB as self-powered device (see Figure 37) or

bus-powered device (see Figure 38).

On the RT600, the USB_VBUS pin is 5 V tolerant pin regardless of whether

USB1_VDD3V3 or VDD pins are present or not.

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