User's Manual

Jennic

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Jennic

8 JN-DS-JN5148-001-Myy 1v1 © Jennic 2009

Signal Function Alternative Function

31 DIO15/SIF_D Serial Interface data / Intelligent Peripheral data

output

General Purpose Digital I/O DIO15

32 DIO16 Intelligent Peripheral data in General Purpose Digital I/O

33 DIO17CTS1

UART1 Clear To Send (input)/ Intelligent

Peripheral device select

General Purpose Digital I/O DIO17

34 DIO18/RTS1 UART1 Request To Send (output)/ Intelligent

Peripheral Interrupt

General Purpose Digital I/O DIO18

35 DIO19/TXD1 UART1 Transmit Data (output) General Purpose Digital I/O DIO19

36 DIO20/RXD1 UART1 Receive Data (input) General Purpose Digital I/O DIO20

37 COMP1-

38 COMP1+

Comparator 1 inputs

39 ADC1 Analogue to Digital input

40 ADC2 Analogue to Digital input

41 ADC3 Analogue to Digital input

*: These two pins are not connected for High power modules

4.2. Pin Descriptions

All pins behave as described in the JN-DS- JN5148 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 JN5148.

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 JN5148 should be held in reset by taking RESETN low. Two potential flash 4MB

memory devices may be used in the module, the Numonyx M25P40 and the SST SST25VF040B.

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

This is available as part of the Software Developer kit and libraries available from Jennic’s support website –

www.jennic.com/support. 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.