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參數(shù)資料
| 型號： | MRF24J40 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | IEEE 802.15.4⑩ 2.4 GHz RF Transceiver |
| 中文描述： | IEEE 802.15.4標準⑩2.4 GHz射頻收發(fā)器 |
| 文件頁數(shù)： | 9/66頁 |
| 文件大?。?/td> | 748K |
| 代理商： | MRF24J40 |
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2006 Microchip Technology Inc.
Advance Information
DS39776A-page 7
MRF24J40
2.0
EXTERNAL CONNECTIONS
2.1
Oscillator
The MRF24J40 is designed to operate at 20 MHz with
a crystal connected to the OSC1 and OSC2 pins. A
typical oscillator circuit is shown in Figure 2-1.
FIGURE 2-1:
CRYSTAL OSCILLATOR
OPERATION
2.2
Oscillator Start-up
The MRF24J40 PHY has an internal PLL that must lock
before the device is capable of transmitting or receiving
packets. After a full Power-on Reset, the device
requires 2 ms to lock. During this delay, all registers
and buffer memory may still be read and written to
through the SPI bus. However, software should not
attempt to transmit any packets (set the TXRTS
(TXNMTRIG<0>)), or access any MAC or PHY
registers during this period.
2.3
CLKOUT Pin
The clock out pin is provided to the system designer for
use as the host controller clock or as a clock source for
other devices in the system. The CLKOUT has an inter-
nal prescaler which can divide the output by 1, 2, 4 or 8.
The CLKOUT function is enabled via the CLKCTRL
register (Register 2-1) and the prescaler is selected via
the RFCTRL7 register (Register 2-2).
Note
1:
A series resistor (R
S
) may be required for AT
strip cut crystals.
C1
C2
XTAL
OSC2
OSC1
Logic
MRF24J40
R
S
(1)
To Internal
REGISTER 2-1:
CLKCTRL: DIVIDED SLEEP CLOCK (50 kHz) SELECTION REGISTER
R/W-0
r
U-0
—
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
CLKOEN
SCLKDIV<4:0>
bit 7
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7
bit 6
bit 5
Reserved:
Maintain as ‘
0
’
Unimplemented:
Read as ‘
0
’
CLKOEN:
20 MHz Clock Output Enable bit
1
= Disable
0
= Enable
SCLKDIV4:SCLKDIV0:
Divided SLPCLK Selection bits
Divided by 2
n
.
bit 4-0
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MRF24J40_08 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:IEEE 802.15.4? 2.4 GHz RF Transceiver |
| MRF24J40_10 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:IEEE 802.15.4a?￠ 2.4 GHz RF Transceiver |
| MRF24J40-I | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:IEEE 802.15.4⑩ 2.4 GHz RF Transceiver |
| MRF24J40-I/ML | 功能描述:射頻收發(fā)器 2.4 Ghz IEEE/ZigBee RoHS:否 制造商:Atmel 頻率范圍:2322 MHz to 2527 MHz 最大數(shù)據(jù)速率:2000 Kbps 調(diào)制格式:OQPSK 輸出功率:4 dBm 類型: 工作電源電壓:1.8 V to 3.6 V 最大工作溫度:+ 85 C 接口類型:SPI 封裝 / 箱體:QFN-32 封裝:Tray |
| MRF24J40-I/ML | 制造商:Microchip Technology Inc 功能描述:ZIGBEE Transceiver IC |
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