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參數資料
| 型號： | MICRF405YML TR |
| 廠商： | Micrel Inc |
| 文件頁數： | 9/46頁 |
| 文件大小： | 649K |
| 描述： | TRANSMITTER ASK/FSK 24-MLF |
| 標準包裝： | 1 |
| 頻率： | 290MHz ~ 980MHz |
| 應用： | ISM |
| 調制或協議： | ASK，FSK |
| 數據傳輸率 - 最大： | 200 kbps |
| 功率 - 輸出： | 10dBm |
| 電流 - 傳輸： | 18mA |
| 數據接口： | PCB，表面貼裝 |
| 天線連接器： | PCB，表面貼裝 |
| 電源電壓： | 2.2 V ~ 3.6 V |
| 工作溫度： | -40°C ~ 125°C |
| 封裝/外殼： | 24-VFQFN 裸露焊盤，24-MLF? |
| 包裝： | 標準包裝 |
| 產品目錄頁面： | 571 (CN2011-ZH PDF) |
| 其它名稱： | 576-1965-6 |
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Micrel
MICRF405
April 2006
9
M9999-041906
(408) 955-1690
Writing to the Control Registers in MICRF405
Writing: A number of octets are entered into
MICRF405 followed by a load-signal to activate the
new setting. Making these events is referred to as a
write sequence. It is possible to update all, 1, or n
control registers in a write sequence. The address to
write to (or the first address to write to) can be any
valid address (0-29). The SIO line is always an input
to the MICRF405 (output from user) when writing.
What to write:
" The address of the control register to write to (or
if more than 1 control register should be written
to, the address of the 1st control register to write
to).
" A bit to enable reading or writing of the control
registers. This bit is called the R/W bit.
" The values to write into the control register(s).
Field
Comments
Address:
A 7-bit field, ranging from 0 to 29. MSB is written first.
R/W bit:
A 1-bit field, = 0 for writing
Values:
A number of octets (1-30 octets). MSB in every octet is written first. The first octet is written to the control
register with the specified address (= Address ). The next octet (if there is one) is written to the control
register with address = Address + 1 and so on.
Table 3. Writing to the Control Registers.
How to write:
Bring SEN low to start a write sequence. The active
state of the SEN line is low . Use the SCK/SIO
serial interface to clock in Address and R/W bit
and Values into the MICRF405. MICRF405 will
sample the SIO line at negative edges of SCK. Make
sure to change the state of the SIO line before the
negative edge, for instance on positive edge. Refer
to Figure 2.
Bring SEN inactive to make an internal load-signal
and complete the write-sequence. Note: there is an
exception to this point. If the programming bit called
load_en (D0 in ControlRegister0) is 0 , then no
load pulse is generated.
The two different ways to program the chip
are:
" Write to a number of control registers (0-29)
when the registers have incremental addresses
(write to 1, all or n registers)
" Write to a number of control registers when the
registers have non-incremental addresses.
Writing to a Single Register
Writing to a control register with address A6, A5,
&A0 is described here. During operation, writing to
1 register is sufficient to change the way the
transmitter works. Typical example: Change from
transmit mode to power-down.
Field
Comments
Address:
7 bit = A6, A5, &A0 (A6 = MSB. A0 = LSB)
R/W bit:
0 for writing
Values:
8 bits = D7, D6, &D0 (D7 = MSB, D0 = LSB)
Table 4. When writing to a Single Register, totally 2 octets are clocked into the MICRF405.
How to write:
" Bring SEN low
" Use SCK and SIO to clock in the 2 octets
" Bring SEN high
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