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 11/33
STM 330 / STM 331 / STM 330C / STM 332U / STM 333U
3.3 Pin description and operational characteristics
STM 33x
Hardware
Symbol
STM 33x
Firmware
Symbol
Function
Characteristics
GND
GND
Ground connection
VDD
VDD
Supply voltage
2.1 V – 5.0 V; Start-up voltage: 2.6 V
Maximum ripple: see 3.6
Not available at pin header.
Supply for pro-
gramming I/F
Recommended supply voltage for
programming 3V
VCHAR
VCHAR
Charging input
Input for an external energy harvester or a
battery. See 3.10.
Supply for pro-
gramming I/F if
VDD cannot be
used.
6
Recommended supply voltage for
programming 3.3V – 3.6 V
VGC
VGC
Voltage Gold Cap
Connection of additional external energy
storage possible. See 3.10.
SWPWR
(= switched
DVDD of
EO3000I)
SWPWR
DVDD supply volt-
age regulator out-
put switched via
transistor con-
trolled by EO3000I
ADIO5 pin.
1.8 V. Output current: max. 5 mA.
Supply for external circuitry, available
while not in deep sleep mode. SWPWR is
switched on 0.25 ms before sampling of
inputs and is switched off afterwards.
UVDDext
(=UVDD of
EO3000I
with 1.8MΩ
in series)
UVDDext
Ultra low power
supply voltage
regulator output
Not for supply of external circuitry!
For use with WAKE pins only, see section
4.1. Limited to max. 1 µA output current
by internal 1.8 MΩ resistor!
IOVDD (not
available at
pin connec-
tor)
IOVDD
GPIO supply volt-
age
Internal connection to EO3000I DVDD
(typ. 1.8 V)
See 3.3.1
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
SET
Analog input
For connection of an external set point
dial. See 4.3
ADIO1
Not used
Internal pull-up; do not connect
ADIO2
Not used
Internal pull-up; do not connect
6
E.g. if module shall be programmed or configured via pin connector.
If a bed of nails fixture for programming is available VDD should be used instead of VCHAR.