LPC54101J512UK49Z datasheet(78/90 Pages) NXP

Part #	LPC54101J512UK49Z

Description	32-bit ARM Cortex-M4/M0 MCU; 104 kB SRAM; 512 kB flash, 3 x I2C, 2 x SPI, 4 x USART, 32-bit counter/ timers, SCTimer/PWM, 12-bit 5.0 Msamples/sec ADC

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Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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78 / 90 page

LPC5410x

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Product data sheet

Rev. 2.6 — 3 October 2016

78 of 90

NXP Semiconductors

LPC5410x

32-bit ARM Cortex-M4/M0+ microcontroller

CL - Crystal load capacitance

CPad - Pad capacitance of the RTCXIN and RTCXOUT pins (~3 pF).

CParasitic – Parasitic or stray capacitance of external circuit.

Although CParasitic 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, output the RTC Clock to one of

the GPIOs and optimize the values of external load capacitors for minimum frequency

deviation.

Remark: The crystals with lower CL (< 12.5 pF) values are not recommended.

13.5.1 RTC Printed Circuit Board (PCB) design guidelines

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

(within 20 mm) 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 CX1, CX2, and CX3, in case of third overtone crystal

usage, 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.

Table 34.

Recommended values for the RTC external 32.768 kHz oscillator CL, RS, DL, and

CX1/CX2 components

Crystal load

capacitance CL

Maximum crystal

series resistance RS

Maximum crystal

drive level DL

External load

capacitors CX1/CX2

12.5 pF

< 70 k



0.5

W

22 pF, 22 pF

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