User Manual

USER MANUAL V1.05
© 2013 EnOcean | www.enocean.com STM 330 / STM 331 / STM 330C / STM 332U / STM 333U User Manual V1.10 | Page 15/33
STM 330 / STM 331 / STM 330C / STM 332U / STM 333U
3.4 Absolute maximum ratings (non operating)
Symbol
Parameter
Min
Max
Units
VDD
Supply voltage at VDD
-0.5
5.5
V
VGC
Voltage gold cap
1.5
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
3.5 Maximum ratings (operating)
Symbol
Parameter
Min
Max
Units
VDD
Supply voltage at VDD and VDDLIM
2.1
5.0
V
VGC
Voltage gold cap
1.5
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
3.6 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.