CH455G

@@ -0,0 +1,58 @@+# CH455G++**WCH Jiangsu Qin Heng** · LED Display Drivers · SOP-16++CH455G from WCH Jiangsu Qin Heng, in a SOP-16. 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 | bidirectional | Segment 4 driver output (active-high, drives segment E of a common-cathode 7-seg digit) and row-4 key-scan input (active-high, with internal pull-down). Continuous drive current up to 40 mA per SEG pin. |+| 2 | SEG5 | bidirectional | Segment 5 driver output (active-high, drives segment F) and row-5 key-scan input (active-high, with internal pull-down). Max 40 mA per SEG. |+| 3 | SEG6 | bidirectional | Segment 6 driver output (active-high, drives segment G) and row-6 key-scan input (active-high, with internal pull-down). Max 40 mA per SEG. |+| 4 | SEG7/INT# | output | In 8-segment mode: decimal-point segment driver (active-high). In 7-segment mode (typical for CH455G, which lacks a dedicated INT# pin): active-low keyboard interrupt output equivalent to INT#. Mode is chosen by the 7SEG bit of the Set System Parameter command. |+| 5 | DIG0 | output | Digit 0 drive (active-low, sinks common-cathode digit current up to 200 mA) during display scan; column-scan output (active-high) during keypad scan. |+| 6 | SCL | input | 2-wire serial clock input, I2C-compatible, up to 4 MHz. Internal pull-up (typ 200 uA); default high. Data is latched on rising edge. |+| 7 | SDA | bidirectional | 2-wire serial data, I2C-compatible open-drain with internal pull-up (typ 300 uA); default high. MSB-first; sampled on SCL rising edge, driven on SCL falling edge. |+| 8 | GND | power_in | Common ground return; must sustain continuous current of at least 150 mA to sink the aggregated segment/digit drive current. |+| 9 | DIG1 | output | Digit 1 drive (active-low, up to 200 mA cathode sink) during display scan; column-scan output (active-high) during keypad scan. |+| 10 | DIG2 | output | Digit 2 drive (active-low, up to 200 mA cathode sink) during display scan; column-scan output (active-high) during keypad scan. |+| 11 | DIG3 | output | Digit 3 drive (active-low, up to 200 mA cathode sink) during display scan; column-scan output (active-high) during keypad scan. |+| 12 | SEG0 | bidirectional | Segment 0 driver output (active-high, drives segment A) and row-0 key-scan input (active-high, with internal pull-down). Max 40 mA per SEG. |+| 13 | SEG1 | bidirectional | Segment 1 driver output (active-high, drives segment B) and row-1 key-scan input (active-high, with internal pull-down). Max 40 mA per SEG. |+| 14 | VCC | power_in | Positive supply, 2.5 V to 5.3 V (recommended 2.7-5 V). Must sustain continuous current of at least 150 mA; decouple with 0.1 uF ceramic and >=100 uF bulk capacitor close to the pin. |+| 15 | SEG2 | bidirectional | Segment 2 driver output (active-high, drives segment C) and row-2 key-scan input (active-high, with internal pull-down). Max 40 mA per SEG. |+| 16 | SEG3 | bidirectional | Segment 3 driver output (active-high, drives segment D) and row-3 key-scan input (active-high, with internal pull-down). Max 40 mA per SEG. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | WCH Jiangsu Qin Heng |+| Package | SOP-16 |+| Category | LED-drv |+| Pins | 16 |++## Ordering variants++- `CH455G`+- `CH455GCH455K`+- `CH455GCH455H`++## CAD (KiCad official)++- Symbol: `CH455G`+- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`+- 3D model: SOP-16 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [WCH Jiangsu Qin Heng datasheet](docs/ch455g-datasheet.pdf) (9 pp, sha256 `3a6969e2dfa69978`, 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](docs/ch455g-datasheet.pdf)

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