STM300C ENOCEAN, STM300C Datasheet - Page 20

• Manufacturer Part Number: STM300C
• Description: MODULE SOC RF TXRX W/8051 MCU
• Manufacturer: ENOCEAN
• Series: Scavengerr

Specifications of STM300C

• Frequency: 315MHz
• Data Rate - Maximum: 125kbps
• Modulation Or Protocol: ASK
• Applications: General Purpose
• Power - Output: 5dBm
• Sensitivity: -98dBm
• Voltage - Supply: *
• Current - Receiving: 33mA
• Current - Transmitting: 24mA
• Data Interface: PCB, Surface Mount
• Memory Size: 32kB Flash, 2kB RAM
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -25°C ~ 85°C
• Package / Case: Module
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 1084-1008-2; S3031-D300

USER MANUAL
STM 300 / STM 300C
3
3.1
STM 300 is designed for use with an external energy harvester and energy storage.
In order to support a fast start-up and long term operation with no energy supply available
usually two different storages are used. The small storage fills quickly and allows a fast
start-up. The large storage fills slowly but once it is filled up it provides a large buffer for
times where no energy is available, e.g. at night in a solar powered sensor.
STM 300 provides a digital output CCO (see also 2.7) which allows controlling the charging
of these two storages. At the beginning, as long as the voltage is below the VON voltage
only the small storage is filled. Once the threshold is reached the CCO signal changes and
the large storage is filled. The short term storage capacitor (C1) is usually in the range of
470 to 1000 µF. For the long term storage we suggest a capacitor (C2) with a capacity of
0.25 F. Below an overview and the schematics of a charging circuitry is shown:
This circuit is designed for an energy storage capacitor specified for 3.3 V (e.g. PAS614L-
VL3. Please pay great attention to manufacturers handling and soldering procedures!)
© 2010 EnOcean | www.enocean.com
APPLICATIONS INFORMATION
How to connect an energy harvester and energy storage
Energy source
e.g. solar panel
STM 300
Vdd
VDDLIM
CCO
V1.30
Short term storage
Charge switcher
C1
RC delay
Overvoltage
protection
STM 300 / STM 300C User Manual V1.30 | Page 20/40
Undervoltage
protection
Long term storage
C2