AX8052F131 datasheet(22/46 Pages) ONSEMI

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Circuit Description

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AX8052F131

Circuit Description

The AX8052F131 is a single chip ultra-low-power RF-microcontroller SoC primarily for use in SRD

bands. The on-chip transmitter consists of a fully integrated RF front-end with modulator, and

demodulator. Base band data processing is implemented in an advanced and flexible

communication controller that enables user friendly communication.

The AX8052F131 contains a high speed microcontroller compatible to the industry standard 8052

instruction set. It contains 64 kBytes of FLASH and 8.25 kBytes of internal SRAM.

The AX8052F131 features 3 16-bit general purpose timers with Σ∆ capability, 2 output compare

units for generating PWM signals, 2 input compare units to record timings of external signals, 2

16-bit wakeup timers, a watchdog timer, 2 UARTs, a Master/Slave SPI controller, a 10-bit 500

kSample/s A/D converter, 2 analog comparators, a temperature sensor, a 2 channel DMA

controller, and a dedicated AES crypto controller. Debugging is aided by a dedicated hardware

debug interface controller that connects using a 3-wire protocol (1 dedicated wire, 2 shared with

GPIO) to the PC hosting the debug software.

While the radio carrier can only be clocked by the crystal oscillator (carrier stability requirements

dictate a high stability reference clock in the MHz range), the microcontroller and its peripherals

provide extremely flexible clocking options. The system clock that clocks the microcontroller, as

well as peripheral clocks, can be selected from one of the following clock sources: the crystal

oscillator, an internal high speed 20 MHz oscillator, an internal low speed 640 Hz/10 kHz oscillator,

or the low frequency crystal oscillator. Prescalers offer additional flexibility with their

programmable divide by a power of two capability. To improve the accuracy of the internal

oscillators, both oscillators may be slaved to the crystal oscillator.

AX8052F131 can be operated from a 2.2 V to 3.6 V power supply over a temperature range of

–40oC to 85oC, it consumes 11 - 45 mA for transmitting, depending on the output power.

The AX8052F131 features make it an ideal interface for integration into various battery powered

SRD solutions such as ticketing or as transmitter for telemetric applications e.g. in sensors. As

primary application, the transmitter is intended for UHF radio equipment in accordance with the

European Telecommunication Standard Institute (ETSI) specification EN 300 220-1 and the US

Federal Communications Commission (FCC) standard CFR47, part 15. The use of AX8052F131 in

accordance to FCC Par 15.247, allows for improved range in the 915 MHz band. Additionally

AX8052F131 is compatible with the low frequency standards of 802.15.4 (ZigBee) and suited for

systems targeting compliance with Wireless M-Bus standard EN 13757-4:2005

The AX8052F131 sends data in frames. This standard operation mode is called Frame Mode. Pre

and post ambles as well as checksums can be generated automatically.

AX8052F131 supports any data rate from 1 kbps to 350 kbps for FSK and MSK, from 1 kbps to

2000 kbps for ASK and from 10 kbps to 2000 kbps for PSK. To achieve optimum performance for

specific data rates and modulation schemes several register settings to configure the

AX8052F131 are necessary, they are outlined in the following, for details see the AX5031

Programming Manual.

Spreading is possible on all data rates and modulation schemes. The net transfer rate is reduced

by a factor of 15 in this case. For ZigBee either 600 or 300 kbps modes have to be chosen.

The transmitter supports multi-channel operation for all data rates and modulation schemes.

AX8052F131 Datasheet(PDF) 22 Page - ON Semiconductor

AX8052F131 Datasheet(HTML) 22 Page - ON Semiconductor

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