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AT86RF231
9.6
9.6.1
9.6.2
Crystal Oscillator (XOSC)
The main crystal oscillator features are:
? 16 MHz amplitude controlled crystal oscillator
? 330 μs typical settling time after leaving SLEEP state
? Configurable trimming capacitance array
? Configurable clock output (CLKM)
Overview
The crystal oscillator generates the reference frequency for the AT86RF231. All other internally
generated frequencies of the radio transceiver are derived from this unique frequency. There-
fore, the overall system performance is mainly determined by the accuracy of crystal reference
frequency. The external components of the crystal oscillator should be selected carefully and the
related board layout should be done with caution (see Section 5. “Application Circuits” on page
12 ).
The register 0x12 (XOSC_CTRL) provides access to the control signals of the oscillator. Two
operating modes are supported. It is recommended to use the integrated oscillator setup as
described in Figure 9-7 on page 116 ; nevertheless a reference frequency can be fed to the inter-
nal circuitry by using an external clock reference as shown in Figure 9-8 on page 117 .
Integrated Oscillator Setup
Using the internal oscillator, the oscillation frequency depends on the load capacitance between
the crystal pins XTAL1 and XTAL2. The total load capacitance C L must be equal to the specified
load capacitance of the crystal itself. It consists of the external capacitors CX and parasitic
capacitances connected to the XTAL nodes.
Figure 9-7 on page 116 shows all parasitic capacitances, such as PCB stray capacitances and
the pin input capacitance, summarized to C PAR .
Figure 9-7.
Simplified XOSC Schematic with External Components
C PAR
CX
CX
C PAR
V DD
EVDD
XTAL1
16MHz
XTAL2
PCB
AT86RF231
C TRIM
XTAL_TRIM[3:0]
C TRIM
XTAL_TRIM[3:0]
EVDD
Additional internal trimming capacitors C TRIM are available. Any value in the range from 0 pF to
4.5 pF with a 0.3 pF resolution is selectable using XTAL_TRIM of register 0x12 (XOSC_CTRL).
116
8111C–MCU Wireless–09/09
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相关代理商/技术参数
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AT86RF231-ZU_09 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Low Power 2.4 GHz Transceiver for ZigBee
AT86RF231-ZUR 功能描述:射频收发器 2.4GHz, Zigbee Transceiver RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray
AT86RF232-ZX 功能描述:射频收发器 2.4 GHZ ZIGBEE TRANSCEIVER RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray
AT86RF232-ZXR 功能描述:射频收发器 2.4 GHZ ZIGBEE TRANSCEIVER RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray
AT86RF233-ZF 功能描述:IC RF TXRX+MCU 802.15.4 32-VFQFN 制造商:microchip technology 系列:- 包装:托盘 零件状态:在售 类型:TxRx + MCU 射频系列/标准:802.15.4，通用 ISM > 1GHz 协议:6LoWPAN，Zigbee? 调制:O-QPSK 频率:2.4GHz 数据速率（最大值）:2Mbps 功率 - 输出:4dBm 灵敏度:-101dBm 存储容量:128B SRAM 串行接口:SPI 电压 - 电源:1.8 V ~ 3.6 V 电流 - 接收:11.3mA ~ 11.8mA 电流 - 传输:7.2mA ~ 13.8mA 工作温度:-40°C ~ 125°C 封装/外壳:32-VFQFN 裸露焊盘 标准包装:490
AT86RF233-ZFR 功能描述:IC RF TXRX+MCU 802.15.4 32-VFQFN 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:在售 类型:TxRx + MCU 射频系列/标准:802.15.4，通用 ISM > 1GHz 协议:6LoWPAN，Zigbee? 调制:O-QPSK 频率:2.4GHz 数据速率（最大值）:2Mbps 功率 - 输出:4dBm 灵敏度:-101dBm 存储容量:128B SRAM 串行接口:SPI 电压 - 电源:1.8 V ~ 3.6 V 电流 - 接收:11.3mA ~ 11.8mA 电流 - 传输:7.2mA ~ 13.8mA 工作温度:-40°C ~ 125°C 封装/外壳:32-VFQFN 裸露焊盘 标准包装:1
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