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User Manual May 2019 | Page 23/49
USER MANUAL
Scavenger Transmitter Module
STM 330 / STM 331 STM 331U / STM 332U / STM 333U
(Stepcode DE and later)
3.6
Absolute maximum ratings (non operating)
Symbol Parameter
Min
Max
Units
VDD
Supply voltage at VDD
-0.5
5.5
V
VGC
Voltage long term storage
2.0
3.3
V
VCHAR Supply voltage from external energy harvester
0
6
V
ICHAR
Supply current from external energy harvester
45
mA
GND
Ground connection
0
0
V
VINA
Voltage at every analog input pin
-0.5
2
V
VIND
Voltage at RESET, WAKE0/1, and every digital input
-0.5
3.6
V
3.7
Maximum ratings (operating)
Symbol Parameter
Min
Max
Units
VDD
Supply voltage at VDD and VDDLIM
2.1
5.0
V
VGC
Voltage long term storage
2.0
3.3
V
VCHAR Supply voltage from external energy harvester
0
6
V
ICHAR
Supply current from external energy harvester
VCHAR<4 V
4 V<VCHAR<6 V
Limited
internally
45
mA
GND
Ground connection
0
0
V
VINA
Voltage at every analog input pin
0
2.0
V
VIND
Voltage at RESET, WAKE0/1, and every digital input
0
3.6
V
3.8
Power management and voltage regulators
Symbol Parameter
Conditions / Notes
Min
Typ
Max
Units
Voltage Regulators
VDDR
Ripple on VDD, where
Min(VDD) > VON
50
mV
pp
UVDD
Ultra Low Power supply
1.8
V
RVDD
RF supply
Internal signal only
1.7
1.8
1.9
V
DVDD
Digital supply
Internal signal only
1.7
1.8
1.9
V
Threshold Detector
VON
Turn on threshold
2.3
2.45
2.6
V
VOFF
Turn off threshold
Automatic shutdown if
VDD drops below VOFF
1.85
1.9
2.1
V
Threshold detector
STM 33x provides an internal ultra low power ON/OFF threshold detector.
If VDD > VON, it turns on the ultra low power regulator (UVDD), the watchdog timer and
the WAKE# pins circuitry. If VDD ≤ VOFF, it initiates the automatic shut down of STM 33x.
For details of this mechanism please refer to the Dolphin Core Description documentation.
