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BU91795MUF-ME2

Public Made by Adom

by adom

ROHM Semicon LCD Drivers, QFN-24-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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BU91795MUF-ME2

ROHM Semicon · LCD Drivers · QFN-24-EP(4x4)

BU91795MUF-ME2 from ROHM Semicon, in a QFN-24-EP(4x4). 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 OSCIN input External clock input, selectable by command against the internal clock; must be connected to VSS when using the internal oscillator.
2 SCL input Serial clock terminal of the 2-wire serial interface (VIH 0.7VDD min, VIL 0.3VDD max).
3 SDA bidirectional Serial data in/out terminal of the 2-wire serial interface, with VOL max 0.4V at 3mA load.
4 SEG0 output Segment output for LCD driving; leave open when unused.
5 SEG1 output Segment output for LCD driving; leave open when unused.
6 SEG2 output Segment output for LCD driving; leave open when unused.
7 SEG3 output Segment output for LCD driving; leave open when unused.
8 SEG4 output Segment output for LCD driving; leave open when unused.
9 SEG5 output Segment output for LCD driving; leave open when unused.
10 SEG6 output Segment output for LCD driving; leave open when unused.
11 SEG7 output Segment output for LCD driving; leave open when unused.
12 SEG8 output Segment output for LCD driving; leave open when unused.
13 SEG9 output Segment output for LCD driving; leave open when unused.
14 SEG10 output Segment output for LCD driving; leave open when unused.
15 SEG11 output Segment output for LCD driving; leave open when unused.
16 COM0 output Common output for LCD driving; leave open when unused.
17 COM1 output Common output for LCD driving; leave open when unused.
18 COM2 output Common output for LCD driving; leave open when unused.
19 COM3 output Common output for LCD driving; leave open when unused.
20 VLCD power_in Power supply for LCD driving, 0V to VDD-2.4V (VDD-VLCD must be at least 2.4V).
21 VDD power_in Power supply, 2.5V to 6.0V recommended (absolute maximum 7.0V).
22 VSS power_in Ground (0V reference).
23 TEST1 input Test input for ROHM use only; must be connected to VSS.
24 TEST2 input POR enable setting: VDD disables POR (software reset then required), VSS enables POR; connect to VSS when unused.
25 EXT-PAD passive Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter Value
Manufacturer ROHM Semicon
Package QFN-24-EP(4x4)
Category Nixie Tube Driver/LED Driver
Pins 25

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Maximum Voltage1 (Power Supply) VDD -0.5 7 V VSS=0V 4
Maximum Voltage2 (LCD Drive Voltage) VLCD -0.5 V upper limit printed as VDD 4
Power Dissipation Pd 0.27 W mounted in ROHM's standard board 4
Input Voltage Range VIN -0.5 V upper limit printed as VDD+0.5 4
Operational Temperature Range Topr -40 105 °C 4
Storage Temperature Range Tstg -55 125 °C 4
Power Supply Voltage1 VDD 2.5 6 V Ta=-40°C to +105°C, VSS=0V 4
Power Supply Voltage2 (LCD drive) VLCD 0 V upper limit printed as VDD-2.4; VDD-VLCD ≥ 2.4V 4
"H" Level Input Current IIH 1 µA SDA,SCL,OSCIN(Note2),TEST2 4
"L" Level Input Current IIL -1 µA SDA,SCL,OSCIN,TEST2 4
SDA "L" Level Output Voltage VOL_SDA 0 0.4 V Iload = 3mA 4
Standby Current IDD1 5 µA Display off, Oscillation off 4
Power Consumption IDD2 12.5 30 µA VDD=3.3V, VLCD=0V, Ta=25°C, Power save mode1, FR=71Hz, 1/3 bias, Frame inverse 4
Frame Frequency1 fCLK1 56 80 112 Hz FR = 80Hz setting, VDD=2.5V to 6.0V, Ta=-40°C to +105°C 5
Frame Frequency2 fCLK2 70 80 90 Hz FR = 80Hz setting, VDD=3.3V, Ta=25°C 5
Frame Frequency3 fCLK3 77.5 87.5 97.5 Hz FR = 80Hz setting, VDD=5.0V, Ta=25°C 5
Frame Frequency4 fCLK4 67.5 87.5 108 Hz FR = 80Hz setting, VDD=5.0V, Ta=-40°C to +105°C 5
External Clock Rise Time tr 0.3 µs External clock mode (OSCIN) 5
External Clock Fall Time tf 0.3 µs External clock mode (OSCIN) 5
External Frequency fEXCLK 15 300 KHz External clock mode (OSCIN) 5
External Clock Duty tDTY 30 50 70 % External clock mode (OSCIN) 5
Input Rise Time tr 0.3 µs 6
Input Fall Time tf 0.3 µs 6
SCL Cycle Time tSCYC 2.5 µs 6
"H" SCL Pulse Width tSHW 0.6 µs 6
"L" SCL Pulse Width tSLW 1.3 µs 6
SDA Setup Time tSDS 100 ns 6
SDA Hold Time tSDH 100 ns 6
Buss Free Time tBUF 1.3 µs 6
START Condition Hold Time tHD;STA 0.6 µs 6
START Condition Setup Time tSU;STA 0.6 µs 6
STOP Condition Setup Time tSU;STO 0.6 µs 6
LCD Driver On Resistance SEG RON 3 kΩ Iload=±10µA 4
LCD Driver On Resistance COM RON 3 kΩ Iload=±10µA 4

CAD (KiCad official)

  • Symbol: BU91795MUF-ME2
  • Footprint: Package_DFN_QFN:QFN-24-1EP_4x4mm_P0.5mm_EP2.6x2.6mm
  • 3D model: QFN-24-EP(4x4) (KiCad packages3D, STEP)
  • 3D model files: bu91795muf-me2-etched.step / bu91795muf-me2-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bu91795muf-me2.step / bu91795muf-me2.glb are the bare package body.

Provenance

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

  • Datasheet: ROHM Semicon datasheet (29 pp, sha256 d33a788a5e596d3e, retrieved 2026-10-24, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF