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MICRF221 bảng dữ liệu(PDF) 11 Page - Micrel Semiconductor

tên linh kiện MICRF221
Giải thích chi tiết về linh kiện  3.3V, QwikRadio 850 MHz to 950 MHz Receiver
PDF  26 Pages
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nhà sản xuất  MICREL [Micrel Semiconductor]
Trang chủ  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MICRF221 bảng dữ liệu(HTML) 11 Page - Micrel Semiconductor

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Micrel Inc.
MICRF221
October 2008
11
M9999-100108
(408) 955-1690
Operation
Trigger pulses are generated from internal D0 edges
and compare with programmable window generated
from the reference clock frequency. If time between
data edges falls within the window data pulse width is
bad. Detected stable bits are counted. Wakeup will
occur allowing data to output if sufficient data bits are
detected. Two bad pulses or lack of pulse cause
device to go to sleep for sleep timer duration.
Squelch action
During normal operation, if 4 or less out of 8 bit pulses
are good squelch output is actived. If good bit count
increases to 7 or more in any 8 sequential bits
squelch output is set low allowing data to output at DO
pin.
Serial Interface
Control Register Individual Truth Tables:
D0
D1
D2
MODE: Desense
0
X
X
No Desense - default
1
0
0
7dB Desense
1
1
0
19dB Desense
1
0
1
32dB Desense
1
1
1
42dB Desense
D3
D4
MODE:
Demod Bandwidth (at 915MHz)
0
0
1625Hz
1
0
3250Hz
0
1
6500Hz
1
1
13000Hz
- default
D5
D6
MODE
1
0
Slice Level 30%
0
1
Slice Level 40%
1
1
Slice Level 50%
- default
0
0
Slice Level 60%
D7
D8
MODE: Bit Check Setting
0
0
Bitcheck 0 bits
- default
1
0
Bitcheck 2 bits
0
1
Bitcheck 4 bits
1
1
Bitcheck 8 bits
D9
D10
D11
MODE:
Bitcheck Window Times
(915MHz)
0
0
0
67us, 136us, 270us, 541us
1
0
0
64us, 126us, 252us, 505us
0
1
0
59us, 118us, 234us, 469us
1
1
0
54us, 108us, 216us, 434us
0
0
1
49us, 100us, 198us, 397us
1
0
1
45us, 90us, 180us, 361us
0
1
1
41us, 82us, 163us, 325us
1
1
1
36us, 72us, 144us, 289us
D12
D13
D14
MODE:
Sleep Time
0
0
0
10ms
1
0
0
20ms
0
1
0
40ms
1
1
0
80ms
0
0
1
160ms
1
0
1
320ms
0
1
1
640ms
1
1
1
1280ms
D15
MODE: Auto Poll
0
Awake – does not poll - default
1
Auto-polls with Sleep periods
D16
MODE: Demod BW Select
0
Normal Demod BW’s - default
1
Fast Demod BW’s
D17
MODE: Squelch Enable
0
Squelch circuit off
- default
1
Squelch circuit active
D18
MODE
0
Sleep polling watchdog active - default
Watchdog time for D3, D4, BW setting:
11
01
10
00
5ms
5ms
10ms
20ms
1
Sleep polling watchdog disabled - unlimited
poll period
D19
MODE
0
RSSI offset 0mV
- default
1
RSSI offset +200mV



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