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Si4320
4. Wake-Up Timer Command
bit
15
1
14
1
13
1
12
r4
11
r3
10
r2
9
r1
8
r0
7
m7
6
m6
5
m5
4
m4
3
m3
2
m2
1
m1
0
m0
POR
E196h
The wake-up time period can be calculated by M < m7 : m0 > and R < r4 : r0 >:
T wake-up = M * 2 R ms
Software reset: Sending FF00h command to the chip triggers software reset. For more details see the Reset modes section.
5. Low Duty-Cycle Command
bit
15
1
14
1
13
0
12
0
11
1
10
1
9
0
8
0
7
d6
6
d5
5
d4
4
d3
3
d2
2
d1
1
d0
0
en
POR
CC0Eh
With this command Low Duty-Cycle operation can be set in order to decrease the average power consumption.
The time cycle is determined by the Wake-Up Timer Command .
The Duty-Cycle is calculated by D < d6 : d0 > and M. (M is parameter in a Wake-Up Timer Command .)
D.C.= (D * 2 +1) / M *100%
6. Low Battery Detector and Microcontroller Clock Divider Command
bit
15
1
14
1
13
0
12
0
11
0
10
0
9
1
8
0
7
d2
6
d1
5
d0
4
t4
3
t3
2
t2
1
t1
0
t0
POR
C200h
The 5-bit value T of t4 - t0 determines the threshold voltage of the threshold voltage V lb of the detector:
V lb = 2.25 V + T * 0.1 V
Clock divider configuration:
d2
0
0
0
0
1
1
1
1
d1
0
0
1
1
0
0
1
1
d0
0
1
0
1
0
1
0
1
Clock Output
Frequency [MHz]
1
1.25
1.66
2
2.5
3.33
5
10
14
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