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參數(shù)資料
| 型號： | M37906M8C-XXXFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, MROM, 20 MHz, MICROCONTROLLER, PDSO42 |
| 封裝： | 0.450 INCH, 0.80 MM PITCH, PLASTIC, SSOP-42 |
| 文件頁數(shù)： | 3/99頁 |
| 文件大?。?/td> | 1313K |
| 代理商： | M37906M8C-XXXFP |
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124
8168C-MCU Wireless-02/10
AT86RF212
7.8.3 PLL Settling Time and Frequency Agility
When the PLL is enabled during state transition from TRX_OFF to PLL_ON or RX_ON,
the settling time is typically tTR4 = 200 s (50 s plus 150 s settling time of the analog
voltage regulator AVREG), including PLL self calibration. For more information, refer to
(PLL_LOCK).
Switching between channels within a frequency band in PLL_ON or RX_ON states is
typically done within tTR20 = 11 s. This makes the radio transceiver highly suitable for
frequency hopping applications.
The PLL frequency in PLL_ON and receive states is 1 MHz below the PLL frequency in
transmit states. When starting the transmit procedure, the PLL frequency is changed to
the transmit frequency within a period of tTR23 = 16 s before really starting the
transmission. After the transmission, the PLL settles back to the receive frequency
within a period of tTR24 = 32 s. These frequency changes do not generate the interrupt
IRQ_0 (PLL_LOCK) or IRQ_1 (PLL_UNLOCK).
7.8.4 Calibration Loops
Due to variation of temperature, supply voltage, and center frequency, the VCO
characteristics may vary.
To ensure a stable operation, two automated control loops are implemented: center
frequency and delay cell calibration. Both calibration loops are initiated automatically
when the PLL is enabled during state transition from TRX_OFF to PLL_ON or RX_ON.
Additionally, both calibration loops are initiated when the PLL changes to a different
frequency setting.
If the PLL operates for a long time on the same channel or the operating temperature
changes significantly, the calibration loops should be initiated manually. The
recommended calibration interval is 5 minutes or less.
Both calibration loops can be initiated manually by SPI command. To start the
calibration, the device should be in state PLL_ON.
The center frequency calibration can be initiated by setting PLL_CF_START = 1
(register 0x1A, PLL_CF). Center frequency calibration generates (if enabled) a
PLL_UNLOCK interrupt. The calibration loop is completed when the PLL_LOCK
interrupt (if enabled) occurs. The duration of the center frequency calibration loop
depends on the difference between the current CF value and the final CF value. During
the calibration, the CF value is incremented or decremented. Each step takes 8 s. The
minimum time is 8 s; the maximum time is 270 s. The recommended procedure to
start the center frequency calibration is to read the register 0x1A (PLL_CF), to set the
PLL_CF_START register bit to 1, and to write the value back to the register.
The delay cell calibration can be initiated by setting the bit PLL_DCU_START of
register 0x1B (PLL_DCU) to 1. The delay time of the programmable delay unit is
adjusted to the correct value. The calibration works as successive approximation and is
independent of the values in the register 0x1B (PLL_DCU). The duration of the
calibration is tTR22 = 10 s.
During both calibration processes, no correct receive or transmit operation is possible.
The recommended state for the calibration is therefore PLL_ON, but calibration is not
blocked at receive or transmit states.
Both calibrations can be executed concurrently.
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| M37906M6C-XXXSP | 16-BIT, MROM, 20 MHz, MICROCONTROLLER, PDIP42 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M37906M8C-XXXSP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:16-BIT CMOS MICROCOMPUTER |
| M37906T-PRB | 功能描述:DEV POD PROBE FOR M37900T2-RPD-E RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 配件 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program RoHS指令信息:IButton RoHS Compliance Plan 標(biāo)準(zhǔn)包裝:1 系列:- 附件類型:USB 至 1-Wire? RJ11 適配器 適用于相關(guān)產(chǎn)品:1-Wire? 設(shè)備 產(chǎn)品目錄頁面:1429 (CN2011-ZH PDF) |
| M37920FCCGP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER FLASH MEMORY VERSION |
| M37920FCCHP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER FLASH MEMORY VERSION |
| M37920FGCGP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER FLASH MEMORY VERSION |
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