# AS1115-BSST

**Advanced Monolithic Systems** · LED Display Drivers · QSOP-24-150mil

AS1115-BSST from Advanced Monolithic Systems, in a QSOP-24-150mil. 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 | SDA | bidirectional | Serial-data I/O, open-drain digital I/O I²C data pin. |
| 2 | DIG0 | output | Digit drive line that sinks current from the display common cathode; keyscan detection optional but must be polled by the µProcessor. |
| 3 | DIG1 | output | Digit drive line that sinks current from the display common cathode; keyscan detection optional but must be polled by the µProcessor. |
| 4 | DIG2 | output | Digit drive line that sinks current from the display common cathode; keyscan detection optional but must be polled by the µProcessor. |
| 5 | DIG3 | output | Digit drive line that sinks current from the display common cathode; keyscan detection optional but must be polled by the µProcessor. |
| 6 | GND | power_in | Ground. |
| 7 | DIG4 | output | Digit drive line that sinks current from the display common cathode; keyscan detection optional but must be polled by the µProcessor. |
| 8 | DIG5 | output | Digit drive line that sinks current from the display common cathode; keyscan detection optional but must be polled by the µProcessor. |
| 9 | DIG6 | output | Digit drive line that sinks current from the display common cathode; keyscan detection optional but must be polled by the µProcessor. |
| 10 | DIG7 | output | Digit drive line that sinks current from the display common cathode; keyscan detection optional but must be polled by the µProcessor. |
| 11 | KEYA | input | Keyscan input line for key readback; can be used for self-addressing. |
| 12 | KEYB | input | Keyscan input line for key readback. |
| 13 | ISET | passive | Sets peak segment current; connect to VDD or a reference voltage through RSET. |
| 14 | SCL | input | Serial-clock input, 3.4MHz maximum rate. |
| 15 | SEGA | output | Seven-segment drive line that sources current to the display. |
| 16 | SEGF | output | Seven-segment drive line that sources current to the display. |
| 17 | SEGB | output | Seven-segment drive line that sources current to the display. |
| 18 | SEGG | output | Seven-segment drive line that sources current to the display. |
| 19 | VDD | power_in | Positive supply voltage, connect to +2.7 to +5.5V supply. |
| 20 | SEGC | output | Seven-segment drive line that sources current to the display. |
| 21 | SEGE | output | Seven-segment drive line that sources current to the display. |
| 22 | SEGDP | output | Decimal point drive line that sources current to the display. |
| 23 | SEGD | output | Seven-segment drive line that sources current to the display. |
| 24 | IRQ | output | Interrupt request output, open drain pin. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Advanced Monolithic Systems |
| Package | QSOP-24-150mil |
| Category | Nixie Tube Driver/LED Driver |
| Pins | 24 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Operating Supply Voltage | VDD | 2.7 |  | 5.5 | V |  | 5 |
| Operating Temperature Range | TAMB | -40 |  | 85 | °C |  | 5 |
| Operating Junction Temperature Range | TJ | -40 |  | 125 | °C |  | 5 |
| Shutdown Supply Current | IDDSD |  | 0.2 | 2 | µA | All digital inputs at VDD or GND, TAMB = +25ºC | 5 |
| Shutdown Supply Current (85C) | IDDSD |  |  | 4 | µA | single digit, TAMB = +85ºC | 5 |
| Operating Supply Current | IDD |  | 0.35 | 0.6 | mA | RSET = open circuit. | 5 |
| Operating Supply Current, all segments on | IDD |  | 335 |  | mA | All segments and decimal point on; ISEG = -40mA. | 5 |
| Display Scan Rate | fOSC | 0.48 |  | 0.96 | kHz | 8 digits scanned | 5 |
| Digit Drive Sink Current | IDIGIT |  | 320 |  | mA | VOUT = 0.65V | 5 |
| Segment Drive Source Current | ISEG | -35 | -41 | -47 | mA | VDD = 5.0V, VOUT = (VDD -1V) | 5 |
| Segment Drive Current Matching | ∆ISEG |  |  | 3 | % |  | 5 |
| Segment Drive Source Current Average | ISEG |  |  | 47 | mA | Average Current | 5 |
| Input Current SDA, SCL | IIH, IIL | -1 |  | 1 | µA | VIN = 0V or VDD | 5 |
| Logic High Input Voltage SDA, SCL | VIH | 0.7 |  |  | xVDD | SDA, SCL | 5 |
| Logic Low Input Voltage SDA, SCL | VIL |  |  | 0.3 | xVDD | SDA, SCL | 5 |
| SDA Output Low Voltage | VOL(SDA) |  |  | 0.4 | V | ISINK = 3mA | 5 |
| Keyscan Open Input Voltage | VKEYopen | 0.8 |  |  | xVDD |  | 5 |
| Keyscan Short Input Voltage | VKEYshort |  |  | 0.7 | xVDD |  | 5 |
| Interrupt Output Low Voltage | VOL(IRQ) |  |  | 0.4 | V | ISINK = 3mA | 5 |
| Hysteresis Voltage | ∆VI |  | 1 |  | V | DIN, CLK, LD/CS | 5 |
| Capacitive Load for each Bus Line | CB |  |  | 550 | pF |  | 5 |
| Open Detection Level Threshold |  | 0.7 | 0.75 | 0.8 | xVDD |  | 5 |
| Short Detection Level Threshold |  | 0.05 | 0.1 | 0.15 | xVDD |  | 5 |
| SCL Frequency | fSCL |  |  | 1 | MHz | CB = 550pF (max) on each Bus Line | 6 |
| Bus Free Time Between STOP and START Conditions | tBUF | 500 |  |  | ns |  | 6 |
| Hold Time for Repeated START Condition | tHOLDSTART | 260 |  |  | ns |  | 6 |
| SCL Low Period | tLOW | 500 |  |  | ns |  | 6 |
| SCL High Period | tHIGH | 260 |  |  | ns |  | 6 |
| Setup Time for Repeated START Condition | tSETUPSTART | 260 |  |  | ns |  | 6 |
| Data Setup Time | tSETUPDATA | 50 |  |  | ns |  | 6 |
| SDA + SCL Rise Time | tRISE |  |  | 120 | ns |  | 6 |
| SDA + SCL Fall Time | tFALL |  |  | 120 | ns |  | 6 |
| STOP Condition Setup Time | tSETUPSTOP | 260 |  |  | ns |  | 6 |
| Pulse Width of Spike Suppressed | tSPIKESUP |  |  | 50 | ns |  | 6 |
| Key Readback Debounce Time |  |  | 20 |  | ms |  | 6 |
| VDD to GND | VDD | -0.3 |  | 7 | V |  | 4 |
| All other pins to GND |  | -0.3 |  | 7 | V | 7 or VDD + 0.3 | 4 |
| DIG0:DIG7 Sink Current |  |  |  | 500 | mA |  | 4 |
| SEGA:SEGG, SEGDP Sink Current |  |  |  | 100 | mA |  | 4 |
| Input Current (latch-up immunity) |  | -100 |  | 100 | mA | Norm: JEDEC 78 | 4 |
| Electrostatic Discharge HBM |  | -1 |  | 1 | kV | Norm: MIL 883 E method 3015 | 4 |
| Junction Temperature |  |  |  | 150 | ºC |  | 4 |
| Storage Temperature Range |  | -55 |  | 150 | ºC |  | 4 |
| Package Body Temperature |  |  |  | 260 | ºC |  | 4 |
| Humidity non-condensing |  | 5 |  | 85 | % |  | 4 |
| Thermal Resistance ΘJA | ΘJA |  | 88 |  | °C/W | on PCB, QSOP-24 package | 4 |

## 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 |
|---|---|---|---|---|
| housing | PC |  | The reflow peak soldering temperature (body temperature) specified is in accordance with IPC/JEDEC J-STD￾020“Moisture/Reflow Sensitivity Classification for Non￾Hermetic Solid State Surface Mount Devic | 4 |
| contacts |  | tin | The lead finish for Pb-free leaded packages is matte tin (100% Sn). | 4 |

## CAD (KiCad official)

- Symbol: `AS1115-BSST`
- Footprint: `Package_SO:QSOP-24_3.9x8.7mm_P0.635mm`
- 3D model: QSOP-24-150mil (KiCad packages3D, STEP)
- 3D model files: `as1115-bsst-etched.step` / `as1115-bsst-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `as1115-bsst.step` / `as1115-bsst.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Advanced Monolithic Systems datasheet](docs/as1115-bsst-datasheet.pdf) (26 pp, sha256 `b0d6e65ddcfcde03`, retrieved 2026-10-30, tier: lcsc)
- **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](docs/as1115-bsst-datasheet.pdf)