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Micrel Inc.
MICRF221
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.
D9
0
1
0
1
0
1
0
1
D10
0
0
1
1
0
0
1
1
D11
0
0
0
0
1
1
1
1
MODE:
Bitcheck Window Times
(915MHz)
67us, 136us, 270us, 541us
64us, 126us, 252us, 505us
59us, 118us, 234us, 469us
54us, 108us, 216us, 434us
49us, 100us, 198us, 397us
45us, 90us, 180us, 361us
41us, 82us, 163us, 325us
36us, 72us, 144us, 289us
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:
D12
0
1
0
1
0
1
D13
0
0
1
1
0
0
D14
0
0
0
0
1
1
MODE:
Sleep Time
10ms
20ms
40ms
80ms
160ms
320ms
D0
0
D1
X
D2
X
MODE: Desense
No Desense - default
0
1
1
1
1
1
640ms
1280ms
1
0
0
7dB Desense
1
1
1
1
0
1
0
1
1
19dB Desense
32dB Desense
42dB Desense
D15
0
1
MODE: Auto Poll
Awake – does not poll - default
Auto-polls with Sleep periods
D3
0
1
0
1
D5
D4
0
0
1
1
D6
MODE:
Demod Bandwidth (at 915MHz)
1625Hz
3250Hz
6500Hz
13000Hz - default
MODE
D16
0
1
D17
0
1
MODE: Demod BW Select
Normal Demod BW’s - default
Fast Demod BW’s
MODE: Squelch Enable
Squelch circuit off - default
Squelch circuit active
1
0
1
0
0
1
1
0
Slice Level 30%
Slice Level 40%
Slice Level 50%
Slice Level 60%
- default
D18
0
MODE
Sleep polling watchdog active - default
Watchdog time for D3, D4, BW setting:
11 01 10 00
5ms 5ms 10ms 20ms
D7
0
1
0
1
D8
0
0
1
1
MODE: Bit Check Setting
Bitcheck 0 bits - default
Bitcheck 2 bits
Bitcheck 4 bits
Bitcheck 8 bits
1
D19
0
Sleep polling watchdog disabled - unlimited
poll period
MODE
RSSI offset 0mV - default
1
RSSI offset +200mV
October 2008
11
M9999-100108
(408) 955-1690
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