– IIC — One IIC; up to 100 kbps with maximum bus loading; multi-master operation; programmable slave address; interrupt driven byte-by-byte data transfer; supports broadcast mode and 10-bit addressing

– TPMx — One 6-channel (TPM3) and two 3-channel (TPM1 and TPM2); selectable input capture, output compare, or buffered edge- or center-aligned PWM on each channel;

– RTC — (Real-time counter) 8-bit modulus counter with binary or decimal based prescaler; external clock source for precise time base, time-of-day, calendar or task scheduling functions; free running on-chip low power oscillator (1 kHz) for cyclic wake-up without external components; runs in all MCU modes

— KBI — Two 8-bit port keyboard interrupt modules

— Input/Output

– Up to 33 GPIO including dedicated GPIO supporting transceiver

– 13 KBI interrupts with selectable polarity

– Hysteresis and configurable pullup device on all input pins; Configurable slew rate and drive strength on all output pins.

• 1.8 V to 3.6 V operating voltage with on-chip voltage regulators

• Temperature range of –40 ℃ to 85 ℃

• 60-pin LGA (8x8 mm) Package

Freescale will support the MC12311 platform with several software solutions:

• SMAC (Simple Media Access Controller) - This codebase provides simple communication and test apps based on drivers/PHY utilities available as source code. This environment is useful for hardware and RF debug, hardware standards certification, and developing proprietary applications.

• IEEE 802.15.4 MAC with custom PHY layer - The Freescale MAC is a robust, mature codebase useful for developing networking solutions. Freescale is implementing an IEEE 802.15.4 MAC-compatible custom sub-1 GHz PHY template that can be used across different frequency bands. This capability allows users to build powerful networking solutions on a known, stable codebase.

• Wireless MBUS stack - Freescale is porting an existing wireless MBUS codebase to the MC12311 platform which will be available through an external partner.

圖2.MC12311 收發(fā)器框圖

圖3.MC12311 MCU框圖

圖4.MC12311典型應(yīng)用電路圖

MC12311 開發(fā)平臺(tái)

The MC12311 development platform is a highly-integrated, cost-effective, system-in-package (SIP), sub-1GHz wireless node solution with an FSK, GFSK, MSK, or OOK modulation-capable transceiver and low-power QE32 8-bit microcontroller. The highly integrated RF transceiver operates over a wide frequency range including 315 MHz, 433 MHz, 470 MHz, 868 MHz, 915 MHz, 928 MHz, and 955 MHz in the license-free Industrial, Scientific and Medical (ISM) frequency bands.

The MC12311 development platform is built around the concept of having a single daughter card (12311-MRB) that contains the MC12311 IC and all necessary I/O connections for use as a self-contained module or for connection to an application motherboard like the TWR-RF board.

圖5.MC12311 開發(fā)平臺(tái)12311-MRB外形圖

Features of the MC12311 development platform include:

• Based on Freescale’s low-cost MC12311 sub-1GHz wireless node solution with an FSK, GFSK, MSK, or OOK modulation-capable transceiver and low-power QE32 8-bit microcontroller, and a functional set of MCU peripherals into a 60-pin LGA package

• Reference design area with small footprint, low cost RF node

— Power Amplifier Output

— Unbalance input/output port

— Flexible RF-Front End for different bands operation

— Programmable output power from -18 dBm to +17 dBm in 1dB steps

— High Sensitivity: down to -120dBm at 1.2kbps

• 32 MHz reference oscillator

• BDM serial MCU debug port

• Optional secondary 32.768 kHz crystal oscillator for accurate low power timing

• Master reset switch

• Full power regulation and management

• 12311-MRB board provides

— Required circuitry for MC12311 - crystals and RF circuitry including SMA connectors for Power Amplifier Output and Input/Output RF port

— Local power supply regulation

— Access to all GPIO

— Standalone or daughter card use modes