User Manual

ManualsBrandsNXP Laboratories UK ManualsElectronicsJN5142-001-M03 IEEE802.15.4 Wireless Module

8 JN-DS-JN5142-x01-Myy 1v0 © NXP Laboratories UK 2012

DIO14

SIF_CLK

TXD0

JTAG_TDO

SPISEL1

CMOS

DIO14, Serial Interface Clock,

UART 0 Transmit Data Output,

JTAG Data Output or SPI Slave

Select Output 1

DIO15

SIF_D

RXD0

JTAG_TDI

SPISEL2

CMOS

DIO15, Serial Interface Data,

UART 0 Receive Data Input, JTAG

Data Input or SPI Slave Select

Output 2

DIO16

COMP1P

SIF_CLK

CMOS

DIO16, Comparator Positive Input

or Serial Interface clock

DIO17

COMP1M

SIF_D

CMOS

DIO17, Comparator Negative Input

or Serial Interface Data

ADC2

VREF

3.3V

Analogue peripheral reference

voltage or ADC input 2

4.2. Pin Descriptions

All pins behave as described in the JN-DS-JN5142 Wireless Microcontroller Datasheet [2], with the exception of the

following:

4.2.1 Power Supplies

A single power supply pin, VDD is provided. Separate analogue (VSSA) and digital (GND) grounds are provided.

These should be connected together at the module pins.

4.2.2 SPI Memory Connections

SPISWP is a write protect pin for the serial flash memory. This should be held low to inhibit writes to the flash device.

SPISSZ is connected to SPI Slave Select 0 on the JN5142.

SPISSM is connected to the Slave Select pin on the memory.

This configuration allows the flash memory device to be programmed using an external SPI programmer if required.

For programming in this mode, the JN5142 should be held in reset by taking RESETN low. Two suggested flash

1Mbit memory devices that may be used in the module are, the Micron M25P10A and the Winbond W25X10B.

The memory can also be programmed over the UART by using the flash programmer software provided by NXP. This

is available as part of the Software Developer kit and libraries available from www.nxp.com/jennic. To enter this

programming mode, SPIMISO (pin 7) should be held low whilst the chip is reset. Once programming has finished, the

chip should be reset, when it will execute the new code downloaded.

For normal operation of the module and programming over the UART, SPISSZ should be connected to

SPISSM.