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HT1621BRQZ

Public Made by Adom

by adom

HTCSEMI LCD Drivers, LQFP-48(7x7). Pinout reviewed by a person against the datasheet, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

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Datasheet

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Contents

README

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HT1621BRQZ

HTCSEMI · LCD Drivers · LQFP-48(7x7)

HT1621BRQZ from HTCSEMI, in a LQFP-48(7x7). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 CS input Active-low chip select input with internal pull-high resistor; CS high disables the serial interface and resets it, halting all data/command transmission between host and HT1621.
2 RD input Read clock input with internal pull-high resistor; RAM data is clocked out on the falling edge of RD and appears on the DATA line for the host to latch on the next rising edge.
3 WR input Write clock input with internal pull-high resistor; data present on the DATA line is latched into the HT1621 on the rising edge of WR.
4 DATA bidirectional 3-wire serial interface data input/output; carries address, command, and RAM data in both read and write directions.
5 VSS power_in Negative power supply ground (0 V reference).
6 OSCO output Crystal oscillator output pad; connect with OSCI to a 32.768 kHz crystal; leave open when the on-chip RC oscillator is selected.
7 OSCI input Crystal oscillator input or external 256 kHz clock input; leave open when on-chip RC oscillator is selected.
8 VLCD power_in LCD bias voltage supply input used to adjust the LCD operating (driving) voltage level.
9 VDD power_in Positive power supply; operating range 2.4 V to 5.2 V (absolute maximum 5.5 V).
10 IRQ output Time-base or WDT overflow flag; NMOS open-drain active-low output, selectable between time-base or WDT function via S/W command.
11 BZ output Tone frequency output (positive side of differential buzzer pair); outputs 2 kHz or 4 kHz as selected by the TONE command.
12 BZB output Tone frequency output, complementary/inverted side of the BZ differential buzzer pair; both BZ and BZB remain low when tone is disabled.
13 COM3 output LCD common output COM3; one of four time-multiplexed common drive outputs for the 32×4 LCD panel.
14 COM2 output LCD common output COM2; one of four time-multiplexed common drive outputs for the 32×4 LCD panel.
15 COM1 output LCD common output COM1; one of four time-multiplexed common drive outputs for the 32×4 LCD panel.
16 COM0 output LCD common output COM0; one of four time-multiplexed common drive outputs for the 32×4 LCD panel.
17 SEG31 output LCD segment output SEG31; one of 32 segment drive outputs mapped directly from the 32×4 display RAM.
18 SEG30 output LCD segment output SEG30; one of 32 segment drive outputs mapped directly from the 32×4 display RAM.
19 SEG29 output LCD segment output SEG29; one of 32 segment drive outputs mapped directly from the 32×4 display RAM.
20 SEG27 output LCD segment output SEG27; positioned out of sequential numerical order at this pin in the LQFP-48 B package per datasheet note (see review_required).
21 SEG28 output LCD segment output SEG28; positioned out of sequential numerical order at this pin in the LQFP-48 B package per datasheet note (see review_required).
22 SEG26 output LCD segment output SEG26; one of 32 segment drive outputs mapped directly from the 32×4 display RAM.
23 SEG25 output LCD segment output SEG25; one of 32 segment drive outputs mapped directly from the 32×4 display RAM.
24 SEG24 output LCD segment output SEG24; one of 32 segment drive outputs mapped directly from the 32×4 display RAM.
25 SEG23 output LCD segment output SEG23; one of 32 segment drive outputs mapped directly from the 32×4 display RAM.
26 SEG22 output LCD segment output SEG22; one of 32 segment drive outputs mapped directly from the 32×4 display RAM.
27 SEG21 output LCD segment output SEG21; one of 32 segment drive outputs mapped directly from the 32×4 display RAM.
28 SEG20 output LCD segment output SEG20; one of 32 segment drive outputs mapped directly from the 32×4 display RAM.
29 SEG19 output LCD segment output SEG19; one of 32 segment drive outputs mapped directly from the 32×4 display RAM.
30 SEG18 output LCD segment output SEG18; one of 32 segment drive outputs mapped directly from the 32×4 display RAM.
31 SEG17 output LCD segment output SEG17; one of 32 segment drive outputs mapped directly from the 32×4 display RAM.
32 SEG16 output LCD segment output SEG16; one of 32 segment drive outputs mapped directly from the 32×4 display RAM.
33 SEG15 output LCD segment output SEG15; one of 32 segment drive outputs mapped directly from the 32×4 display RAM.
34 SEG14 output LCD segment output SEG14; one of 32 segment drive outputs mapped directly from the 32×4 display RAM.
35 SEG13 output LCD segment output SEG13; one of 32 segment drive outputs mapped directly from the 32×4 display RAM.
36 SEG12 output LCD segment output SEG12; one of 32 segment drive outputs mapped directly from the 32×4 display RAM.
37 SEG11 output LCD segment output SEG11; one of 32 segment drive outputs mapped directly from the 32×4 display RAM.
38 SEG10 output LCD segment output SEG10; one of 32 segment drive outputs mapped directly from the 32×4 display RAM.
39 SEG9 output LCD segment output SEG9; one of 32 segment drive outputs mapped directly from the 32×4 display RAM.
40 SEG8 output LCD segment output SEG8; one of 32 segment drive outputs mapped directly from the 32×4 display RAM.
41 SEG7 output LCD segment output SEG7; one of 32 segment drive outputs mapped directly from the 32×4 display RAM.
42 SEG6 output LCD segment output SEG6; one of 32 segment drive outputs mapped directly from the 32×4 display RAM.
43 SEG5 output LCD segment output SEG5; one of 32 segment drive outputs mapped directly from the 32×4 display RAM.
44 SEG4 output LCD segment output SEG4; one of 32 segment drive outputs mapped directly from the 32×4 display RAM.
45 SEG3 output LCD segment output SEG3; one of 32 segment drive outputs mapped directly from the 32×4 display RAM.
46 SEG2 output LCD segment output SEG2; one of 32 segment drive outputs mapped directly from the 32×4 display RAM.
47 SEG1 output LCD segment output SEG1; one of 32 segment drive outputs mapped directly from the 32×4 display RAM.
48 SEG0 output LCD segment output SEG0; one of 32 segment drive outputs mapped directly from the 32×4 display RAM.

Key specifications

Parameter Value
Manufacturer HTCSEMI
Package LQFP-48(7x7)
Category LED Drivers
Pins 48

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part Material Colour / plating Datasheet says Page
contacts gold z HT1621D: 28-pin SKDIP28 package z HT1621G: 48-pad Gold bumped chip 1

CAD (KiCad official)

  • Symbol: HT1621BRQZ
  • Footprint: Package_QFP:LQFP-48_7x7mm_P0.5mm
  • 3D model: LQFP-48(7x7) (KiCad packages3D, STEP)
  • 3D model files: ht1621brqz-etched.step / ht1621brqz-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ht1621brqz.step / ht1621brqz.glb are the bare package body.

Provenance

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

  • Datasheet: HTCSEMI datasheet (22 pp, sha256 224b566d1221cf6e, retrieved 2026-10-21, tier: lcsc)
  • 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