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参数资料
| 型号： | MAX1471EVKIT-315 |
| 厂商： | Maxim Integrated |
| 文件页数： | 17/26页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT FOR MAX1471 315MHZ |
| 其它有关文件： | Automotive Product Guide |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 类型： | 接收器，ASK/FSK |
| 频率： | 315MHz |
| 适用于相关产品： | MAX1471 ~ 315MHz |
| 已供物品： | 板 |
315MHz/434MHz Low-Power, 3V/5V
ASK/FSK Superheterodyne Receiver
CS
SCLK
DIO
C3
C2
C1
C0
A3
A2
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
COMMAND
Figure 9. Data Input Diagram
CS
SCLK
ADDRESS
DATA
DIO
0
0
1
0
A3
A2
A1
A0
0
0
0
0
0
0
0
0
C3
C2
C1
C0
A3
A2
A1
A0
D7
D0
READ
COMMAND
ADDRESS
DATA
COMMAND
ADDRESS
DATA
ADATA (IF DOUT_ASK = 1)
R7
R6
R5
R4
R3
R2
R1
R0
R7
R0
REGISTER DATA
REGISTER
DATA
FDATA (IF DOUT_FSK = 1)
R7
R6
R5
R4
R3
R2
R1
R0
R7
R0
Figure 10. Read Command on a 4-Wire SERIAL Interface
REGISTER DATA
REGISTER
DATA
Discontinuous Receive Mode (DRX = 1)
In the discontinuous receive mode (DRX = 1), the
power signals of the different modules of the MAX1471
toggle between OFF and ON, according to internal
timers t OFF , t CPU , and t RF . It is also necessary to write
the frequency divisor of the external crystal in the oscil-
lator frequency register (register 0x3). This number is
the integer result of f XTAL /100kHz. Before entering the
discontinuous receive mode for the first time, it is also
necessary to calibrate the timers (see the Calibration
section).
The MAX1471 uses a series of internal timers (t OFF ,
t CPU , and t RF ) to control its power-up. The timer
sequence begins when both CS and DIO are one. The
MAX1471 has an internal pullup on the DIO pin, so the
user must tri-state the DIO line when CS goes high.
The external CPU can then go to a sleep mode during
t OFF . A high-to-low transition on DIO, or a low level on
DIO serves as the wake-up signal for the CPU, which
must then start its wake-up procedure, and drive DIO
low before t LOW expires (t CPU + t RF ). Once t RF expires,
the MAX1471 enables the FSKOUT and/or ASKOUT
data outputs. The CPU must then keep DIO low for as
long as it may need to analyze any received data.
Releasing DIO causes the MAX1471 to pull up DIO,
reinitiating the t OFF timer.
Oscillator Frequency Register (Address: 0x3)
The MAX1471 has an internal frequency divider that
divides down the crystal frequency to 100kHz. The
MAX1471 uses the 100kHz clock signal when calibrating
itself and also to set the image-rejection frequency. The
hexadecimal value written to the oscillator frequency reg-
ister is the nearest integer result of f XTAL /100kHz.
For example, if data is being received at 315MHz, the
crystal frequency is 9.509375MHz. Dividing the crystal
frequency by 100kHz and rounding to the nearest inte-
ger gives 95, or 0x5F hex. So for 315MHz, 0x5F would
be written to the oscillator frequency register.
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| MAX1471EVKIT-433 | 功能描述:射频接收器 RoHS:否 制造商:Skyworks Solutions, Inc. 类型:GPS Receiver 封装 / 箱体:QFN-24 工作频率:4.092 MHz 工作电源电压:3.3 V 封装:Reel |
| MAX1471EVSYS-315 | 功能描述:射频开发工具 MAX1471 Eval Kit RoHS:否 制造商:Taiyo Yuden 产品:Wireless Modules 类型:Wireless Audio 工具用于评估:WYSAAVDX7 频率: 工作电源电压:3.4 V to 5.5 V |
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