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| 型号： | MICRF405YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 10/46页 |
| 文件大小： | 649K |
| 描述： | TRANSMITTER ASK/FSK 24-MLF |
| 标准包装： | 1 |
| 频率： | 290MHz ~ 980MHz |
| 应用： | ISM |
| 调制或协议： | ASK，FSK |
| 数据传输率 - 最大： | 200 kbps |
| 功率 - 输出： | 10dBm |
| 电流 - 传输： | 18mA |
| 数据接口： | PCB，表面贴装 |
| 天线连接器： | PCB，表面贴装 |
| 电源电压： | 2.2 V ~ 3.6 V |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 24-VFQFN 裸露焊盘，24-MLF? |
| 包装： | 标准包装 |
| 产品目录页面： | 571 (CN2011-ZH PDF) |
| 其它名称： | 576-1965-6 |
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Micrel
MICRF405
April 2006
10
M9999-041906
(408) 955-1690
SEN
SIO
SCK
Register address
Data to write
into register
Internal load pulse
generated here
A6 A5A4 A3 A2 A1 A0R/W
D7 D6D5D4D3D2D1 D0
Figure 2. Writing to One Address.
In Figure 2, SIO is changed at positive edges of
SCK. The MICRF405 samples the SIO line at
negative edges. The value of the R/W bits is always
0 for writing.
Writing to All Registers
Writing to all register can be done at any time. To
get the simplest firmware, always write to all
registers. The price to pay for the simplicity is
increased write-time, which leads to increased time
to change the way the MICRF405 works. If data is
transferred through DATAIN pin write address 0-23
(address 24-29 is dont care). If data is transferred
through SPI write address 0-28 (Address 29 is only
written to during data transfer, not during
configuration).
What to write
Field
Comments
Address:
0000000 (address of the first register to write to, which is 0)
R/W bit:
0 for writing
Values:
1
st
Octet: wanted values for ControlRegister0. 2
nd
Octet: wanted values for ControlRegister1 and
so on for all of the octets.
Table 5. When writing to All Registers, totally 25/30 (5 are optional) octets are clocked into the MICRF405.
How to write:
" Bring SEN low
" Use SCK and SIO to clock in the 25/30 octets
" Bring SEN high
Refer to Figure 3. Writing to n Registers Having
Incremental Addresses.
Writing to n Registers Having Incremental
Addresses
In addition to entering all bytes, it is also possible to
enter a set of n bytes, starting from address i = A6,
A5, & A0 . Typical example: Clock in a new set of
frequency dividers (i.e. change the RF frequency).
Registers to be written are located in i, i+1, i+2.
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