参数资料
型号: SI4421-A0-FT
厂商: Silicon Laboratories Inc
文件页数: 27/45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
17. Status Read Command
Bit
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
0
7
0
6
0
5
0
4
0
3
0
2
0
1
0
0
0
POR
0000h
The read command starts with a zero, whereas all other control commands start with a one. If a read command is identified, the
status bits will be clocked out on the SDO pin as follows:
Status Register Read Sequence with FIFO Read Example:
Bit Name
RGIT
FFIT
POR
RGUR
FFOV
WKUP
EXT
LBD
FFEM
ATS
RSSI
DQD
CRL
ATGL
OFFS(6)
OFFS(3) -OFFS(0)
Function
TX register is ready to receive the next byte (Can be cleared by Transmitter Register Write Command , page 24)
The number of data bits in the RX FIFO has reached the pre-programmed limit (Can be cleared by any of the
FIFO read methods)
Power-on reset (Cleared after Status Read Command )
TX register under run, register over write (Cleared after Status Read Command )
RX FIFO overflow (Cleared after Status Read Command )
Wake-up timer overflow (Cleared after Status Read Command )
Logic level on interrupt pin (pin 16) changed to low (Cleared after Status Read Command )
Low battery detect, the power supply voltage is below the pre-programmed limit
FIFO is empty
Antenna tuning circuit detected strong enough RF signal
The strength of the incoming signal is above the pre-programmed limit
Data quality detector output
Clock recovery locked
Toggling in each AFC cycle
MSB of the measured frequency offset (sign of the offset value)
Offset value to be added to the value of the frequency control parameter (Four LSB bits)
Note: In order to get accurate values the AFC has to be disabled during the read by clearing the en bit in the AFC Control Command
(page 21). The AFC offset value (OFFS bits in the status word) is represented as a two’s complement number. The actual
frequency offset can be calculated as the AFC offset value multiplied by the current PLL frequency step (see the Frequency
Setting Command on page 17).
27
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