Wireless Microcontroller : Jennic JN5148-001

Wireless Microcontroller blog diagram

The JN5148-001 is an ultra low power, high performance wireless microcontroller targeted at ZigBee PRO networking applications. The device features an enhanced 32-bit RISC processor offering high coding efficiency through variable width instructions, a multi-stage instruction pipeline and low power operation with programmable clock speeds. It also includes a 2.4GHz IEEE802.15.4 compliant transceiver, 128kB of ROM, 128kB of RAM, and a rich mix of analogue and digital peripherals. The large memory footprint allows the device to run both a network stack, e.g. ZigBee PRO, and an embedded application or in a co-processor mode. The operating current is below 18mA, allowing operation direct from a coin cell. Enhanced peripherals include low power pulse counters running in sleep mode designed for pulse counting in AMR applications and a unique Time of Flight ranging engine, allowing accurate location services to be implemented on wireless sensor networks. It also includes a 4-wire I2S audio interface, to interface directly to mainstream audio CODECs, as well as conventional MCU peripherals.
The JN5148-001 is an ultra low power, high performance wirelessmicrocontroller targeted at ZigBee PRO networking applications. The devicefeatures an enhanced 32-bit RISC processor offering high coding efficiencythrough variable width instructions, a multi-stage instruction pipeline and lowpower operation with programmable clock speeds. It also includes a 2.4GHzIEEE802.15.4 compliant transceiver, 128kB of ROM, 128kB of RAM, and arich mix of analogue and digital peripherals. The large memory footprintallows the device to run both a network stack, e.g. ZigBee PRO, and anembedded application or in a co-processor mode. The operating current isbelow 18mA, allowing operation direct from a coin cell.Enhanced peripherals include low power pulse counters running in sleepmode designed for pulse counting in AMR applications and a unique Timeof Flight ranging engine, allowing accurate location services to beimplemented on wireless sensor networks. It also includes a 4-wire I2Saudio interface, to interface directly to mainstream audio CODECs, as wellas conventional MCU peripherals.

wireless microcontroller JN5148-001

• Single chip integrates transceiver and microcontroller for wireless sensor networks

• Large memory footprint to run ZigBee PRO together with an application

• Very low current solution for long battery life

• Highly featured 32-bit RISC CPU for high performance and low power

• System BOM is low in component count and cost

• Extensive user peripherals

Applications

• Robust and secure low power

wireless applications

• ZigBee PRO networks

• Smart metering

(e.g. AMR)

• Home and commercial building automation

• Location Aware services – e.g.

Asset Tracking

• Industrial systems

• Telemetry

• Remote Control

• Toys and gaming peripherals Features: Transceiver

• 2.4GHz IEEE802.15.4 compliant

• Time of Flight ranging engine

• 128-bit AES security processor

• MAC accelerator with packet formatting, CRCs, address check, auto-acks, timers

• 500 & 667kbps data rate modes

• Integrated sleep oscillator for low power

• On chip power regulation for 2.0V to 3.6V battery operation

• Deep sleep current 100nA

• Sleep current with active sleep timer 1.25?A

• <$0.50 external component cost

• Rx current 17.5mA

• Tx current 15.0mA

• Receiver sensitivity -95dBm

• Transmit power 2.5dBm Features: Microcontroller

• Low power 32-bit RISC CPU, 4 to 32MHz clock speed

• Variable instruction width for high coding efficiency

• Multi-stage instruction pipeline

• 128kB ROM and 128kB RAM for bootloaded program code & data

• JTAG debug interface

• 4-input 12-bit ADC, 2 12-bit DACs, 2 comparators

• 3 application timer/counters,

• 2 UARTs

• SPI port with 5 selects

• 2-wire serial interface

• 4-wire digital audio interface

• Watchdog timer

• Low power pulse counters

• Up to 21 DIO

The JN5148-001 is an IEEE802.15.4 wireless microcontroller that provides a fully integrated solution for applications using the IEEE802.15.4 standard in the 2.4 – 2.5GHz ISM frequency band [1], including ZigBee PRO. It includes all of the functionality required to meet the IEEE802.15.4 and ZigBee PRO specifications and has additional processor capability to run a wide range of applications including, but not limited to Smart Energy, Automatic Meter Reading, Remote Control, Home and Building Automation, Toys and Gaming. Applications that transfer data wirelessly tend to be more complex than wired ones. Wireless protocols make stringent demands on frequencies, data formats, timing of data transfers, security and other issues. Application development must consider the requirements of the wireless network in addition to the product functionality and user interfaces. To minimise this complexity, Jennic provides a series of software libraries and interfaces that control the transceiver and peripherals of the JN5148. These libraries and interfaces remove the need for the developer to understand wireless protocols and greatly simplifies the programming complexities of power modes, interrupts and hardware functionality.

In view of the above, the register details of the JN5148 are not provided in the datasheet. The device includes a Wireless Transceiver, RISC CPU, on chip memory and an extensive range of peripherals. Hereafter, the JN5148-001 will be referred to as JN5148.

Wireless Transceiver

The Wireless Transceiver comprises a 2.45GHz radio, a modem, a baseband controller and a security coprocessor. In addition, the radio also provides an output to control transmit-receive switching of external devices such as power amplifiers allowing applications that require increased transmit power to be realised very easily. Appendix B.4, describes a complete reference design including Printed Circuit Board (PCB) design and Bill Of Materials (BOM). The security coprocessor provides hardware-based 128-bit AES-CCM, CBC(1), CTR and CCM* processing as specified by the IEEE802.15.4 standard. It does this in-band on packets during transmission and reception, requiring minimal intervention from the CPU. It is also available for off-line use under software control for encrypting and decrypting packets generated by software layers such as ZigBee and user applications. This means that these algorithms can be off-loaded by the CPU, increasing the processor bandwidth available for user applications. The transceiver elements (radio, modem and baseband) work together to provide IEEE802.15.4 Medium Access Control (MAC) under the control of a protocol stack. Applications incorporating IEEE802.15.4 functionality can be rapidly developed by combining user-developed application software with a protocol stack library. (1) AES-CBC processing is only available off-line for use under software control.

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