FM1906 from Shenzhen Fuman, in a SSOP-24-150mil. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	SEG4	output	LCD segment output SEG4.
2	SEG2	output	LCD segment output SEG2.
3	CSB	input	Active-low chip select input with internal pull-up. When CSB is high the serial interface is reset and read/write to FM1906 is disabled; when low, serial commands and data are accepted.
4	RDB	input	Active-low READ strobe input with internal pull-up. On the falling edge of RDB, RAM data is driven onto DATA and latched by the host on the next rising edge.
5	WRB	input	Active-low WRITE strobe input with internal pull-up. On the rising edge of WRB, the data present on DATA is written into FM1906.
6	DATA	bidirectional	Serial data input/output for the 4-wire host interface; requires an external pull-up resistor. Direction is controlled by WRB/RDB.
7	VSS	power_in	Negative supply / ground reference (0 V).
8	VLCD	power_in	LCD bias supply input used by the internal LCD bias circuit; VLCD must be less than VDD and is typically set via an external adjustable resistor to tune LCD contrast (e.g. VDD=5V, VLCD=4V with R=15kΩ ±20%).
9	VDD	power_in	Positive supply pin, 3.0-5.0 V operating range (absolute max 5.5 V).
10	COM0	output	LCD common (backplane) output 0.
11	COM1	output	LCD common (backplane) output 1.
12	COM2	output	LCD common (backplane) output 2.
13	COM3	output	LCD common (backplane) output 3.
14	SEG26	output	LCD segment output SEG26.
15	SEG24	output	LCD segment output SEG24.
16	SEG22	output	LCD segment output SEG22.
17	SEG20	output	LCD segment output SEG20.
18	SEG18	output	LCD segment output SEG18.
19	SEG16	output	LCD segment output SEG16.
20	SEG14	output	LCD segment output SEG14.
21	SEG12	output	LCD segment output SEG12.
22	SEG10	output	LCD segment output SEG10.
23	SEG8	output	LCD segment output SEG8.
24	SEG6	output	LCD segment output SEG6.

Key specifications

Parameter	Value
Manufacturer	Shenzhen Fuman
Package	SSOP-24-150mil
Category	LED-drv
Pins	24

CAD (KiCad official)

Symbol: FM1906
Footprint: Package_SO:SSOP-24_5.3x8.2mm_P0.65mm
3D model: SSOP-24-150mil (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Shenzhen Fuman datasheet (12 pp, sha256 51d69f25dc7e5b55, retrieved 2026-08-17, tier: lcsc)
Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF