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參數(shù)資料
| 型號： | NRF9E5-EVKIT868 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 433/868/915MHz RF Transceiver with Embedded 8051 Compatible Microcontroller and 4 Input, 10 Bit ADC |
| 中文描述： | 433/868/915MHz RF收發(fā)器與8051兼容的嵌入式微控制器和4輸入，10位ADC |
| 文件頁數(shù)： | 51/104頁 |
| 文件大小： | 1436K |
| 代理商： | NRF9E5-EVKIT868 |
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PRODUCT SPECIFICATION
nRF9E5 Single Chip Transceiver with Embedded Microcontroller and ADC
Main office: Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway -Phone +4772898900 - Fax +4772898989
Revision: 1.1
Page 51 of 104
June 2004
16
LF CLOCK WAKEUP FUNCTIONS AND WATCHDOG
16.1
The LF Clock
The nRF9E5 contains has an internal low frequency clock CKLF that is always active.
When the crystal oscillator clocks the circuit, the CKLF is a 4kHz clock derived from
the crystal oscillator (provided the CKLFCON register is set according to crystal
frequency and prescaler. XOF and UP_CLK_FREQ respectively, see Table 22). When
no crystal oscillator clock is available, the CKLF is a low power RC oscillator
(LP_OSC) that cannot be disabled, so it will run continuously as long as VDD = 1.8V.
The microprocessor can determine the phase of the CKLF clock by reading CK_CTRL
SFR 0xB6, see Table 50.
16.2
Tick Calibration
The “TICK” is an interval (in CKLF periods) that determines the resolution of the
watchdog and the RTC wakeup timer. The tick is nominally 1ms (4 CKLF cycles).
When the CPU is active and in power down modes where the chip still has crystal clock,
the “TICK” will be as accurate as the crystal oscillator. When the CKLF switches to the
RC oscillator (LP_OSC) in deep power down modes, the tick will no longer be accurate.
The LP_OSC clock source is very inaccurate, and may vary from 0.5ms to 3ms
depending production lot, temperature and supply voltage. That means that Watchdog
and RTC wakeup may not be used for any accurate timing functions if these power
down modes are used.
The accuracy can be improved by calibrating the TICK value at regular intervals. The
register TICK_DV controls how many LP_OSC periods elapse between each TICK. The
frequency of the LP_OSC (between 1 kHz and 5 kHz) can be measured by timer2 in
capture mode with t2ex enabled (EXEN2=1). The signal connected to t2ex has exactly
half the frequency of LP_OSC. The 16-bit difference between two consecutive captures
in SFR-registers{RCAP2H,RCAP2L} is proportional to the LP_OSC period. For details
about timer2 see ch. 18.8.3 and Figure 21 Timer 2 – Timer/Counter with Capture
TICK is controlled by SFRs 0xB5 and 0xBF
Addr
SFR
B5
R/W
#bit
Init
Hex
03
Name
Function
R/W
8
TICK_DV
Divider that’s used in generating TICK from CKLF
frequency.
T
TICK
= (1 + TICK_DV) / f
CKLF
The default value gives a TICK of 1ms nominal as
default (with CKLF derived from crystal oscillator).
Configure CKLF generation with crystal frequency
and prescaler value. Note this register only controls the
generation of CKLF, not the actual prescaler values.
5-3: Should be set equal to XOF, Table 22
2: Should be set equal to UP_CLK_EN, Table 22
1-0: Should be set equal to UP_CLK_FREQ, Table 22
BF
R/W
6
27
CKLFCON
Table 43 TICK control register - SFR 0xB5.
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| nRF9E5-EVKIT-868/915 | 功能描述:射頻開發(fā)工具 NRF9E5 EVAL KIT 868/915 RoHS:否 制造商:Taiyo Yuden 產(chǎn)品:Wireless Modules 類型:Wireless Audio 工具用于評估:WYSAAVDX7 頻率: 工作電源電壓:3.4 V to 5.5 V |
| NRF9E5-EVKIT915 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:433/868/915MHz RF Transceiver with Embedded 8051 Compatible Microcontroller and 4 Input, 10 Bit ADC |
| NRF9E5IC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:433/868/915MHz RF Transceiver with Embedded 8051 Compatible Microcontroller and 4 Input, 10 Bit ADC |
| nRF9E5-REEL | 功能描述:射頻收發(fā)器 433/868/915MHz TRNSCVR 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 |
| NRF-D | 制造商:IDEC 功能描述:35mmDINKi[pT[Lbgz_ Bulk 制造商:IDEC CORPORATION 功能描述:DIN RAIL MT.ADAPTOR |
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