参数资料
型号: SI4421-A0-FT
厂商: Silicon Laboratories Inc
文件页数: 24/45页
文件大小: 0K
描述: IC TXRX FSK 915MHZ 3.8V 16-TSSOP
标准包装: 96
频率: 433MHz,868MHz,915MHz
数据传输率 - 最大: 256kbps
调制或协议: FSK
应用: ISM
功率 - 输出: 7dbm
灵敏度: -110dBm
电源电压: 2.2 V ~ 3.8 V
电流 - 接收: 15mA
电流 - 传输: 28mA
数据接口: PCB,表面贴装
天线连接器: PCB,表面贴装
工作温度: -40°C ~ 85°C
封装/外壳: 16-TSSOP(0.173",4.40mm 宽)
包装: 管件
产品目录页面: 585 (CN2011-ZH PDF)
其它名称: 336-1737-5
Si4421
12. PLL Setting Command
Bit
15
1
14
1
13
0
12
0
11
1
10
1
9
0
8
0
7
0
6
ob1
5
ob0
4
1
3
dly
2
ddit
1
1
0
bw0
POR
CC77h
Bits 6-5 ( ob1-ob0 ): Microcontroller output clock buffer rise and fall time control. The ob1-ob0 bits are changing the output drive
current of the CLK pin. Higher current provides faster rise and fall times but can cause interference.
ob1
1
1
0
ob0
1
0
X
Selected μC CLK frequency
5 or 10 MHz (recommended)
3.3 MHz
2.5 MHz or less
Note: Needed for optimization of the RF performance. Optimal settings can vary according to the external load capacitance.
Bit 3 ( dly ): Switches on the delay in the phase detector when this bit is set.
Bit 2 ( ddit ): When set, disables the dithering in the PLL loop.
Bit 0 ( bw0 ): PLL bandwidth can be set for optimal TX RF performance.
bw0
0
1
Max bit rate [kbps]
86.2
256
Phase noise at 1MHz offset [dBc/Hz]
-107
-102
Note: POR default settings of the register were carefully selected to cover almost all typical applications. When changing these
values, examine thoroughly the output RF spectrum. For more information, contact Silicon Labs Support.
13. Transmitter Register Write Command
Bit
15
1
14
0
13
1
12
1
11
1
10
0
9
0
8
0
7
t7
6
t6
5
t5
4
t4
3
t3
2
t2
1
t1
0
t0
POR
B8AAh
With this command, the controller can write 8 bits (t7 to t0) to the transmitter data register. Bit 7 (el) must be set in Configuration
Setting Command (page 15).
Multiple Byte Write with Transmit Register Write Command:
nSEL
SCK
SDI
TX BYTE1
TX BYTE2
TX BYTEn
Transmit Register Write
command
SDO
(REGISTER IT
in TX mode*)
Note: *The transceiver is in transmit (TX) mode when bit er is cleared using the Power Management Command
Note: Alternately the transmit register can be directly accessed by nFFS (pin6).
24
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