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Micrel Inc.
T1 < 0.1 us, Time from SCLK to convert DO to input
pin
T6 > 0.1 us, SCLK high time
T7 > 0.1 us, SCLK low time
T2, T3, T4, T5, T8, T9, T10 > 0.1 us
Only bits 19 and 18 High, Figure 17.
MICRF221
BIT TIME 18
BIT TIME 19
T10
SCLK
“1”
D1
“0”
DO
“1”
DO
DO PIN AS OUTPUT
Figure 14. Serial Interface Stop Sequence
Serial Interface Examples
All bits (D19 through D0) low (channel 1 is the DO pin,
and Channel 2 is the SCLK pin), see Figure 15.
Figure 17 D19 = D18 = 1.
Autopoll example, Figure 18.
D0 = D1 = D2 = 0, no desense
D3 = D4 = 0, demodulator bandwidth = 1712 hertz, 1
kHz baud rate, pulse = 500 usec, required
demodulator bandwidth is 0.65/500usec = 1300 hertz
D5 = D6 = 1, Slice level = 50%
D7 = 0, D8 = 1, bit check = 4 bits. This is the time the
device is ON checking for four consecutive valid
windows.
D9 = D10 = 1, D11 = 0, data rate is 1 kHz, (500 usec
pulses), window set to 433 usec (< 500 usec)
D12 = D13 = 0, D14 = 1, sleep timer set to 160 msec,
that is, 4 bit is ON and 160 msec is OFF.
Figure 15. All bits 0s.
All bits (D19 through D0) High, Figure 16.
D15 = 1, device is placed in autopoll
D16 = 0, normal demodulator bandwidth
D17 = 0, squelch is OFF
D18 = 1, watchdog timer is OFF
D19 = 0, no RSSI offset
From MSB to LSB, see Table 7:
D19
0
D11
0
D18
1
D10
1
D17
0
D9
1
D16
0
D8
1
D15
1
D7
0
D14
1
D6
1
D13
0
D5
1
D12
0
D4
0
D3
0
D2
0
D1
0
D0
0
Figure 16 All bits 1s.
Table 7. Autopoll example bit sequence
October 2008
18
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