USER MANUAL
STM 431J – Scavenger Transmitter Module
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STM 431J User Manual | v2.0 | Nov 2017 | Page 28/ 34
3.6
EEPROM Storage for the Rolling code
The STM 431J was developed to be used with internal memory. The EEPROM is connected
to the SDA and SLK pins and it is suited on the PCB of the STM 431. The SWPWR pin con-
trols the power supply of the EEPROM. Please consider that the SWPWR pin also provides
energy to possible external sensor circuit – absolute maximum is
5 mA
.
The EEPROM current is typ. 0.1 mA for 5 ms during write operation. For details please refer
to the User Manual of the EEPROM [7] (24AA08).
3.6.1
Included Information:
[ID:XXXXXXXX KY:YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY]
ID: 3 CHARS
XX 8 CHARS
FREESPACE 1 CHARS
KY: 3 CHARS
YY 32 CHARS
= 47 CHARS
3.6.2
QR-Code Specification
QR-Code Version:
3 (29x29 pixel)
Error Correction Level:
Q (25% error correction)
Mode:
Alphanumeric Mode
Character Capacity:
47
Keep off are around the code:
2 Pixel (UP, Down, Left und Right)
Pixel Size:
min. 4x4 points per Pixel
600dpi x 600dpi Resolution:
1 Printpoint: 0.0423mm x 0.0423mm
1 Pixel: 0.1693mm x 0.1693mm
