nanoLOC AVR Module - Components
Small Form RF Module Integrating nanoLOC TRX Transceiver and ATmel AVR Microcontroller
Components
nanoLOC TRX Transceiver (NA5TR1)
nanoLOC supports a freely adjustable center frequency with 3 non-overlapping frequency channels within the 2.4 GHz ISM band. This provides support for multiple physically independent networks and improved coexistence performance with existing 2.4 GHz wireless technologies. Data rates are selectable from 2 Mbps to 125 kbps. Due to the chip’s unique chirp pulse, adjustment of the antenna is not critical. This significantly simplifies the system’s installation and maintenance (“pick and place”). A sophisticated MAC controller with CSMA/CA and TDMA support is included, as is Forward Error Correction (FEC) and 128 bit hardware encryption. To minimize software and microcontroller requirements, nanoLOC also provides scrambling, automatic address matching, and packet retransmission.
Atmel AVR ATmega644V microcontroller
This is a low power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture with 64 KB Flash, 4 KB SRAM, and 2 KB EEPROM. This microcontroller drives the nanoLOC chip via the SPI interface and operates between 1.8 V and 5.5 V.
Matching circuits (Balun)
At the RF interface of the nanoLOC chip, a differential impedance of 150 W exists which is matched to the asymmetrical 50 W impedance of the antenna port by a 150 / 50 RF balun. Additional external components at the RF interface have a power and noise matching function that allows a sharing of the antenna without an external RX/TX – RF switch.
Integrated 2.4 GHz chip antenna
As well as this integrated antenna, an external 2.4 GHz antenna can also be connected to the module.
ISM band pass filter
For an improved robustness against out of band inferences, an ISM band pass filter is connected at the antenna port.
32.768 kHz, 16 MHz, and 32 MHz quartz crystals
The 32.768 kHz Quartz is used for the Real Time Clock oscillator. The 16 MHz Quartz is used by the ATmega microcontroller, while the 32 MHz Quartz works with the internal oscillator circuitry of the nanoLOC chip.
Connectors
The nanoLOC AVR Module is programmable over JTAG or SPI interfaces. 36 peripheral module pins in total are provided, with 16 programmable digital IOs and 2 analog inputs. The module also provides a pulse-width modulation (PWM) output, a microcontroller reset input, a Universal Synchronous RX/TX (USART) input/output, and a TX/RX signal that enables an external PA.
Programming Interfaces
The nanoLOC AVR Module can be programmed over SPI or JTAG pads. The SPI pads have been provided on both top and bottom sides of the module, while the JTAG pads are located on the bottom side.
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