other or that cross each other. In order to avoid and mitigate the high-frequency noise and any coupling. Please ensure that the
analog comparator input signal impedance is 50K or less.(see
Figure 9.
on page 12)
Figure 10. Shielding of analog signals
Placing ground planes and shapes alongside sensitive analog signals provides shielding on the PCB. Care should be taken to
minimize the length of the paths of these types of signal on the PCB. This prevents interference and I/O cross-talk affecting the
signal. The large amount of metal has the lowest possible resistance and lowest possible inductance because of the large, flattened
conductor pattern. The ground plane acts as a low-impedance return path for decoupling high-frequency currents caused by fast
digital logic. It also minimizes emissions from electromagnetic interference/radio-frequency interference (EMI/RFI). In other hand,
the ground planes also permit high-speed digital or analog signals to be transmitted via transmission-line (microstrip or stripline)
techniques, where controlled impedances are required.
7 Communication modules
7.1 LIN interface for LPUART module
The Local Interconnect Network (LIN) is a serial communication protocol, designed to support automotive networks. As the lowest
level of a hierarchical network, LIN enables cost-effective communication with sensors and actuators when all the features of CAN
are not required.
Features of the LPUART module supports and include:
• LIN master and slave operation
• Full-duplex, standard non-return-to-zero (NRZ) format
• Programmable baud rates (13-bit modulo divider) with configurable oversampling ratio from 4x to 32x
• Transmit and receive baud rate can operate asynchronous to the bus clock:
— Baud rate can be configured independently of the bus clock frequency
— Supports operation in Stop modes
NXP Semiconductors
Communication modules
Hardware Design Guidelines for S32K1xx Microcontrollers , Rev. 3, December 2018
Application Note
13 / 33
