NXP Semiconductors LPC550x Hardware Design Manuallines Download | Manualshive

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Figure 11. ADC block diagram

The datasheet only shares the RADIN values, as shown in

.

Table 11. ADC input resistance

Min.

Typical

Max.

Unit

Ri

Input resistance

Fast Input Channels

PIO0_16/PIO0_23

—

1

2

kΩ

PIO0_11/PIO0_10

—

1

2

kΩ

PIO0_12/PIO0_15

—

1

2

kΩ

PIO1_0/PIO0_31

—

1

2

kΩ

Standard Input Channels

PIO1_9/PIO1_8

—

1.4

3.6

kΩ

9 Recommendations

9.1 Pin descriptions

NXP Semiconductors

Recommendations

Hardware Design Guidelines for LPC55(S)xx Microcontrollers, Rev. 0, 30 October 2020

Application Note

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Summary of Contents for LPC550x

Page 1: ...C552x 150 MHz YES YES YES LPC55S6x LPC556x 150 MHz YES YES YES Table 2 LPC55Sxx LPC55xx peripherals Family Flexcomm 50 MHz HS SPI HS USB FS USB CAN FD SDIO LPC55S0x LPC550x 8 1 1 LPC55S1x LPC551x 8 1...

Page 2: ...N 64 HTQFP 64 VFBGA 98 HLQFP 100 HLQFP 144 VBGA 196 LPC55S0x LPC550x LPC55S1x LPC551x LPC55S2x LPC552x LPC55S6x LPC556x For details see the latest version of the Datasheet and User Manuel on www nxp c...

Page 3: ...rnal DC DC converter The power and ground pins are described in subsequent sections NXP Semiconductors Power supply Hardware Design Guidelines for LPC55 S xx Microcontrollers Rev 0 30 October 2020 App...

Page 4: ...Package HTQFP64 VFBGA98 HLFP100 USB0_3V3 USB0 Analog 3 3 V supply 3 3 V 10 uF 10 uF 10 uF 0 1 uF X7R Ceramic USB1_3V3 USB1 Analog 3 3 V supply 3 3 V 10 uF 10 uF 10 uF 0 1 uF X7R Ceramic VDD Single po...

Page 5: ...Star ground connections VSSA Analog ground FB Feedback node LX DCDC power stage output 3 2 Bulk and decoupling capacitors The effectiveness of the bulk bypass and the de coupling capacitors depends o...

Page 6: ...lock input bypass mode for clock frequencies of up to 24 MHz Crystal oscillator with 32 768 kHz operating frequency Option for external clock input bypass mode for clock frequencies of up to 100 kHz P...

Page 7: ...7 Components of the oscillator circuit Symbol Description XTAL Quartz crystal ceramic resonator CX1 Stabilizing capacitor CX2 Stabilizing capacitor For best results it is very critical to select a mat...

Page 8: ...llator 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 and CX...

Page 9: ...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 h...

Page 10: ...oint The crystal or resonator oscillator is sensitive to stray capacitance and noise from other signals It should be placed away from high frequency devices and traces in order to avoid and reduce the...

Page 11: ...ns Boot mode ISP0 PIO0_5 pin Description Passive boot HIGH The LPC55S6x LPC55S2x LPC552x will look for valid image in the internal flash if no valid image is found the LPC55S6x LPC55S2x LPC552x will e...

Page 12: ...to debugger easier The JTAG functions TRST TCK TMS TDI and TDO are selected on pins PIO0_2 to PIO0_6 by hardware when the part is in boundary scan mode The JTAG functions CANNOT be used for debug mode...

Page 13: ...nput Pull Up RESET RESET Reset MCU Dedicate Pin Pull Up GND GND Ground Dedicate Pins External pull up down resistors for the JTAG signals can be added in order to increase debugger connection robustne...

Page 14: ...ro Magnetic Compatibility EMC reasons although ISO 11898 2 also allows for unshielded cable A maximum line length of 40 meters is specified for CAN at a data rate of 1 Mb However at lower data rates p...

Page 15: ...es transferred at faster rates up to 8 Mbps Like most others CAN physical transceivers the CANH and CANL are available for the designer to terminate bus depending on the application Figure 9 and Figur...

Page 16: ...put resistance Fast Input Channels PIO0_16 PIO0_23 1 2 k PIO0_11 PIO0_10 1 2 k PIO0_12 PIO0_15 1 2 k PIO1_0 PIO0_31 1 2 k Standard Input Channels PIO1_9 PIO1_8 1 4 3 6 k 9 Recommendations 9 1 Pin desc...

Page 17: ...hardware when the part is in boundary scan mode The JTAG functions cannot be used for debug mode NOTE 9 2 Termination of unused pins Table 12 shows how to terminate pins that are not used in the appli...

Page 18: ...the use of this type of board In this case the major requirement is to ensure a good structure for ground and for the power supply 9 4 General board layout guidelines 9 4 1 Traces recommendations A ri...

Page 19: ...and single layer PCBs The objective of grounding techniques is to minimize the ground impedance and thus to reduce the potential of the ground loop from circuit back to the supply Route high speed si...

Page 20: ...his application note does not go into the electromagnetic theory or explain the whys of different techniques used to combat the effects but it considers the effects and solutions most recommended as a...

Page 21: ...oop of signal and corresponding ground The five main sources of radiation are digital signals propagating on traces current return loop areas inadequate power supply filtering or decoupling transmissi...

Page 22: ...or connectors 9 4 4 PCB layer stacking To reach signal integrity and performance requirements four layer PCB is recommended for implementing Ethernet applications and systems The following layer stac...

Page 23: ...words the voltage and current of an input signal must be within the electrical parameter allowed The outcome of violating these specifications causes unexpected behavior stuck operation or a major da...

Page 24: ...uld implement appropriate design and operating safeguards to minimize the risks associated with their applications and products NXP the NXP logo NXP SECURE CONNECTIONS FOR A SMARTER WORLD COOLFLUX EMB...

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