Specifications

Current savings in sleep
The following measurements were taken with a DiZiC MB851 evaluation board, and so some of the
current draw was from the board, not just the chip. However, the delta in current readings should be
meaningful.
Mode Measured current draw
Awake with radio on (rx(True)) 29.1 mA
Awake with radio off (rx(False)) 10.3 mA
sleep(0, 0) 1.4 uA
sleep(1, 0) 0.6 uA
sleep(2, 0) 0.3 uA
Built-in function txPwr():
The SNAPpy txPwr() function takes a parameter between 0 and 17, providing access to 18 total power
settings. The following table shows how those 18 settings were mapped to the 25 distinct power
settings supported by the STM32W108. Refer to the pokeRadio() built-in for a way to access the other
7 settings.
txPwr(value) ST_RadioSetPower(value)
17 8
16 7
15 6
14 5
13 4
12 2
11 0
10 -2
9 -4
8 -6
7 -8
6 -11
5 -12
4 -14
3 -17
2 -20
1 -26
0 -43
SNAP Reference Manual Document Number 600-0007K Page 197 of 202