Specifications

SPECIFICATIONS FOR LIQUID CRYSTAL DISPLAY MODULE
MODEL NO: 12232-10
PACIFIC DISPLAY DEVICES 04.25.2012 7
1.10 LCM Application Notes
The Epson SED1520 (or equivalent Avant SBN1661G) is used on many Pacific Display Devices GDM 12232 family modules
with 122 segments and 32 commons. Extrapolating the information needed to interface to these ICs on the standard module
might be a bit difficult from the Epson documentation. Here is a brief that may speed your progress.
Duty Cycle:
Set the Duty to 1/32 (D=1).
Master / Slave Configuration:
The PDD GDM 12232 display family uses the commons from both ICs to form the 32 common rows. Both ICs are used in the
active mode. One SED-1520 /
SBN1661G will be hardware configured on the PCB as Master by connecting the M/S pin to
Vdd. The other controller IC will be hardware configured as Slave by connecting the M/S pin to Vss. With the duty set to
1/32 the master will manage the multiplexing for all 32 commons. Addressing the rows on the SED-1520 /
SBN1661G is done
by paging. 1 page is 8 bits (or 1 word). The word is written entirely in the same segment (column), but down across 8
commons.
Display Writing Example:
Starting in the upper left of the display (CS1 (Left Side), Page 0 (First 8 commons), Segment 0), write a full word of data. The
data will write to the first column on the display on rows 1 to 8. If one repeats this for all 61 segments, the first page will be
full on the left side of the panel. The segment addresses should increment automatically after each write (up till 80), but since
there are only 61 segments it will need to be set back to 0 if you are writing in sequence. Apply settings CS1, Page 1, Segment
0 and repeat writing 61 words. Then repeat writing 61 words for CS1 / Page 2 / Segment 0 and CS1 / Page 3 / Segment 0. At
this point, the left hand side of the display should be complete. One can repeat the process substituting CS2 (Right Side).