SI4420-D1-FT Datasheet, PDF (21/33 Pages) List of Unclassifed Manufacturers – Si4420 Universal ISM Band FSK Transceiver

Si4420
13. Low Duty-Cycle Command
Bit 15 14 13 12 11 10 9
1100100
876543210
0 d6 d5 d4 d3 d2 d1 d0 en
POR
C80Eh
With this command, Low Duty-Cycle operation can be set in order to decrease the average power consumption in receiver mode.
The time cycle is determined by the Wake-Up Timer Command.
The Duty-Cycle can be calculated by using (d6 to d0) and M. (M is parameter in a Wake-Up Timer Command.)
Duty-Cycle= (D * 2 +1) / M *100%
Xtal osc.
enable
Receiver
On
DQD
2.25ms
Ton
Twake-up
Ton
Twake-up
2.25ms
Ton
Twake-up
Bit 0 (en): Enables the Low Duty-Cycle Mode. Wake-up timer interrupt not generated in this mode.
Note: In this operation mode, bit er must be cleared and bit ew must be set in the Power Management Command.
14. Low Battery Detector and Microcontroller Clock Divider Command
Bit 15 14 13 12 11 10 9
1100000
876543210
0 d2 d1 d0 v4 v3 v2 v1 v0
The 5 bit parameter (v4 to v0) represents the value V, which defines the threshold voltage V_lb of the detector:
V_lb= 2.25 + V * 0.1 [V]
Clock divider configuration:
POR
C000h
d2 d1 d0
000
001
010
011
100
101
110
111
Clock Output
Frequency [MHz]
1
1.25
1.66
2
2.5
3.33
5
10
The low battery detector and the clock output can be enabled or disabled by bits eb and dc, respectively, using the Power Management
Command.
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