User's Manual
Table Of Contents
- 1 GENERAL DESCRIPTION
- 2 FUNCTIONAL DESCRIPTION
- 2.1 Simplified firmware flow chart and block diagram
- 2.2 Pin out
- 2.3 Pin description and operational characteristics
- 2.4 Absolute maximum ratings (non operating)
- 2.5 Maximum ratings (operating)
- 2.6 Power management and voltage regulators
- 2.7 Configuration
- 2.8 Radio telegram
- 2.9 Transmit timing
- 2.10 Charging circuitry
- 2.11 Energy consumption
- 3 APPLICATIONS INFORMATION
- 4 AGENCY CERTIFICATIONS
USER MANUA
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V0.6
© 2010 EnOcean | www.enocean.com STM 31x / STM 31xC User Manual V0.6 | Page 13
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STM 31X / STM 31XC
2.6 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 31x 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 31x. For details of this
mechanism please refer to the Dolphin Core Description documentation.
2.7 Configuration
2.7.1 Configuration via pins
The encoding input pins have to be left open or connected to GND in correspondence with
the following connection schemes. These settings are checked at every wake-up.
Wake-up cycle time
CW_0 CW_1 Wake-up cycle time
NC GND 1 s ±20%
GND NC 10 s ±20%
NC NC 100 s ±20%
GND GND No cyclic wake-up