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TM1621B

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by Ray

TM Shenzhen Titan Micro Elec LCD Drivers, LQFP-44(10x10). Datasheet-verified pinout, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

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PCB Footprint

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Datasheet

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Contents

README

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TM1621B

TM Shenzhen Titan Micro Elec · LCD Drivers · LQFP-44(10x10)

TM1621B from TM Shenzhen Titan Micro Elec, in a LQFP-44(10x10). 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 SEG7 output LCD segment 7 driver output.
2 SEG6 output LCD segment 6 driver output.
3 SEG5 output LCD segment 5 driver output.
4 SEG4 output LCD segment 4 driver output.
5 SEG3 output LCD segment 3 driver output.
6 SEG2 output LCD segment 2 driver output.
7 SEG1 output LCD segment 1 driver output.
8 SEG0 output LCD segment 0 driver output.
9 /CS input Active-low chip select for the 4-wire serial interface. Reads/writes are ignored while /CS is high (the serial interface state machine is reset); communication is enabled when /CS is driven low.
10 /RD input Read clock line. On the falling edge of /RD, TM1621B places internal data on DATA; the host may latch on the following rising edge.
11 /WR input Write clock line. Data on DATA is latched into TM1621B on the rising edge of /WR.
12 DATA bidirectional Serial data I/O for both commands and data (open-drain style; requires an external pull-up resistor, typ. 10 kΩ to VDD).
13 VSS power_in Logic ground / system ground reference.
14 OSCO output Crystal oscillator output. Connect to a 32.768 kHz crystal between OSCI and OSCO for the crystal clock source; leave floating when using the internal RC oscillator or an external clock on OSCI.
15 OSCI input Crystal oscillator input, or external 256 kHz clock input. Tie to the crystal (with OSCO) or drive with an external clock; leave floating when using the internal RC oscillator.
16 VLCD power_in LCD bias supply input. Must be lower than VDD; typically driven from a resistor divider (e.g. VR = 15 kΩ ±20% for VDD = 5 V, VLCD = 4 V).
17 VDD power_in Positive logic supply, 2.4 V to 5.2 V.
18 /IRQ output Time-base / watchdog overflow flag, NMOS open-drain output (requires external pull-up). Asserted low on time-base or WDT overflow when the IRQ EN command has enabled it.
19 BZ output Buzzer tone output, non-inverting half of the differential audio pair. Toggles at 2 kHz or 4 kHz when TONE ON is issued; held low when the tone generator is disabled.
20 /BZ output Buzzer tone output, inverting half of the differential audio pair used with BZ to drive a piezo buzzer differentially. Held low when the tone generator is disabled.
21 COM0 output LCD common (backplane) driver output 0.
22 COM1 output LCD common (backplane) driver output 1.
23 COM2 output LCD common (backplane) driver output 2.
24 COM3 output LCD common (backplane) driver output 3.
25 SEG31 output LCD segment 31 driver output.
26 SEG30 output LCD segment 30 driver output.
27 SEG29 output LCD segment 29 driver output.
28 SEG28 output LCD segment 28 driver output.
29 SEG27 output LCD segment 27 driver output.
30 SEG26 output LCD segment 26 driver output.
31 SEG25 output LCD segment 25 driver output.
32 SEG24 output LCD segment 24 driver output.
33 SEG23 output LCD segment 23 driver output.
34 SEG22 output LCD segment 22 driver output.
35 SEG21 output LCD segment 21 driver output.
36 SEG20 output LCD segment 20 driver output.
37 SEG19 output LCD segment 19 driver output.
38 SEG18 output LCD segment 18 driver output.
39 SEG17 output LCD segment 17 driver output.
40 SEG16 output LCD segment 16 driver output.
41 SEG15 output LCD segment 15 driver output.
42 SEG14 output LCD segment 14 driver output.
43 SEG13 output LCD segment 13 driver output.
44 SEG12 output LCD segment 12 driver output.
45 SEG11 output LCD segment 11 driver output.
46 SEG10 output LCD segment 10 driver output.
47 SEG9 output LCD segment 9 driver output.
48 SEG8 output LCD segment 8 driver output.

Key specifications

Parameter Value
Manufacturer TM Shenzhen Titan Micro Elec
Package LQFP-44(10x10)
Category LED Drivers
Pins 48

CAD (KiCad official)

  • Symbol: TM1621B
  • Footprint: Package_QFP:LQFP-44_10x10mm_P0.8mm
  • 3D model: LQFP-44(10x10) (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: TM Shenzhen Titan Micro Elec datasheet (17 pp, sha256 cb7da894e47c944c, 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