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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© 2010 EnOcean | www.enocean.com STM 31x / STM 31xC User Manual V0.6 | Page 10
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STM 31X / STM 31XC
2.3 Pin description and operational characteristics
STM 31x
H a rd w a re
Sym bol
STM 31x
Firm w a re
Sym bol
Function C haracteristics
GND GND Ground connection
VDD VDD Supply voltage 2.1 V – 5.0 V; Start-up voltage: 2.6 V
Maximum ripple: see 2.6
Connection of external 3 V battery possible
VCHAR VCHAR Charging input Input for external energy harvester (for
use in STM 312). See 2.10.
VGC VGC Voltage Gold Cap Connection of additional external energy
storage or battery possible. See 2.10.
SWPWR
(= switched
DVDD)
SWPWR
DVDD supply volt-
age regulator out-
put switched via
transistor con-
trolled by EO3000I
WXIDIO pin.
1.8 V. Output current: max. 5 mA.
Supply for external circuitry, available
while not in deep sleep mode. SWPWR is
switched on 2ms (default) before sampling
of inputs and is switched off afterwards.
The delay time can be configured, see
2.7.2 (needed for stabilization of sensors)
UVDDext
(=UVDD
with 1.8MΩ
in series)
UVDD
Ultra low power
supply voltage
regulator output
Not for supply of external circuitry!
For use with WAKE pins only, see section
3.1. Limited to max. 1 µA output current
by internal 1.8 MΩ resistor!
IOVDD (not
available at
pin connec-
tor)
IOVDD
Digital interface
supply voltage
Internal connection to EO3000I DVDD
(typ. 1.8 V)
See 2.3.1.
RESET
RESET
Reset input
Programming I/F
Active high reset (1.8 V)
Fixed internal 10 kΩ pull-down.
PROG_EN
PROG_EN
Programming I/F HIGH: programming mode active
LOW: operating mode
Digital input, fixed internal 10 kΩ pull-
down.
ADIO0
AD_0
Analog input Input read ~2 ms after wake-up.
Resolution 8 bit. See also 2.7.2.
ADIO1 AD_1 Analog input Input read ~2 ms after wake-up.
Resolution 8 bit (default) or 10 bit.
See 2.7.2.
ADIO2 AD_2 Analog input Input read ~2 ms after wake-up.
Resolution 8 bit (default) or 6 bit.
See 2.7.2.
ADIO3 DI_0 Digital input Input read ~2 ms after wake-up.
See 2.7.2.
Internal pull-up
ADIO4
DI_1
Digital input Input read ~2 ms after wake-up.
See 2.7.2.
Internal pull-up