fix: add vson footprint #431

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joncherry wants to merge 11 commits into tscircuit:main from joncherry:vson

src/fn/index.ts

-Original file line number
+Diff line change
@@ Expand Up / @@ -59,6 +59,7 @@ export { sot23w } from "./sot23w" @@
     export { to92s } from "./to92s"
     export { jst } from "./jst"
     export { sod110 } from "./sod110"
+    export { vson } from "./vson"
     export { vssop } from "./vssop"
     export { msop } from "./msop"
     export { sod323w } from "./sod323w"
@@ Expand Down @@

src/fn/vson.ts

-Original file line number
+Diff line change
@@ -0,0 +1,156 @@
+    import type {
+      AnyCircuitElement,
+      PcbSmtPad,
+      PcbSilkscreenPath,
+    } from "circuit-json"
+    import { rectpad } from "../helpers/rectpad"
+    import { z } from "zod"
+    import { base_def } from "../helpers/zod/base_def"
+    import { length, distance } from "circuit-json"
+    import { dim2d } from "src/helpers/zod/dim-2d"
+    import { type SilkscreenRef, silkscreenRef } from "src/helpers/silkscreenRef"
+    // can't use defaults because there is not a lot of common dimensions.
+    export const vson_def = base_def.extend({
+      fn: z.string(),
+      num_pins: z.number().optional().default(8),
+      p: distance.describe("pitch (distance between center of each pin)"),
+      w: length.describe("width between vertical rows of pins"),
+      grid: dim2d.describe("width and height of the border of the footprint"),
+      ep: dim2d
+        .default("0x0mm")
+        .describe("width and height of the central exposed thermal pad"),
+      epx: length
+        .default("0mm")
+        .describe("x offset of the center of the central exposed thermal pad"),
+      pinw: length.describe("width of the pin pads"),
+      pinh: length.describe("height of the pin pads"),
+    })
+    export type VsonDefInput = z.input<typeof vson_def>
+    export type VsonDef = z.infer<typeof vson_def>
+    export const vson = (
+      raw_params: VsonDefInput,
+    ): { circuitJson: AnyCircuitElement[]; parameters: any } => {
+      const parameters = vson_def.parse(raw_params)
+      const { num_pins, p, w, grid, ep, epx, pinw, pinh } = parameters
+      if (num_pins % 2 !== 0) {
+        throw new Error("invalid number of pins")
+      }
+      const pads: PcbSmtPad[] = []
+      // place the 8 or 10 outside pins
+      for (let i = 0; i < num_pins; i++) {
+        const { pinX, pinY } = getCcwVsonCoords({
+          pinCount: num_pins,
+          pinIndex: i,
+          width: w,
+          pitch: p,
+        })
+        pads.push(rectpad(i + 1, pinX, pinY, pinw, pinh))
+      }
+      // place the central exposed pad (ep)
+      if (ep.x > 0 && ep.y > 0) {
+        pads.push(rectpad(parameters.num_pins + 1, epx, 0, ep.x, ep.y))
+      }
+      // draw silkscreen lines around grid dimensions
+      const silkscreenPaths = getSilkscreenPaths(grid)
+      // draw the text for the reference designator
+      const silkscreenRefText: SilkscreenRef = silkscreenRef(
+,
+        grid.y / 2 + p,
+        grid.y / 6,
+      )
+      return {
+        circuitJson: [...pads, ...silkscreenPaths, silkscreenRefText],
+        parameters,
+      }
+    }
+    const getCcwVsonCoords = (params: {
+      pinCount: number
+      pinIndex: number
+      width: number
+      pitch: number
+    }) => {
+      let pinY = 0
+      let pinX = 0
+      const centerY = ((params.pinCount / 2 - 1) * params.pitch) / 2
+      const pinHalf = params.pinCount / 2
+      if (params.pinIndex + 1 <= pinHalf) {
+        pinY = params.pitch * params.pinIndex - centerY
+        pinX = 0 - params.width / 2
+      } else {
+        pinY = params.pitch * (params.pinCount - params.pinIndex - 1) - centerY
+        pinX = params.width / 2
+      }
+      return { pinX, pinY }
+    }
+    const getSilkscreenPaths = (grid: { x: number; y: number }) => {
+      const borderMargin = 0.1
+      const cornerLine = grid.y / 30
+      const silkscreenPaths: PcbSilkscreenPath[] = [
+        // top silkscreen path
+        {
+          layer: "top",
+          pcb_component_id: "",
+          pcb_silkscreen_path_id: "",
+          type: "pcb_silkscreen_path",
+          route: [
+            {
+              x: -grid.x / 2 - borderMargin,
+              y: grid.y / 2 + borderMargin - cornerLine,
+            },
+            {
+              x: -grid.x / 2 - borderMargin,
+              y: grid.y / 2 + borderMargin,
+            },
+            {
+              x: grid.x / 2 + borderMargin,
+              y: grid.y / 2 + borderMargin,
+            },
+            {
+              x: grid.x / 2 + borderMargin,
+              y: grid.y / 2 + borderMargin - cornerLine,
+            },
+          ],
+          stroke_width: grid.y / 30,
+        },
+        // bottom silkscreen path
+        {
+          layer: "top",
+          pcb_component_id: "",
+          pcb_silkscreen_path_id: "",
+          type: "pcb_silkscreen_path",
+          route: [
+            {
+              x: -grid.x / 2 - borderMargin,
+              y: -grid.y / 2 - borderMargin + cornerLine,
+            },
+            {
+              x: -grid.x / 2 - borderMargin,
+              y: -grid.y / 2 - borderMargin,
+            },
+            {
+              x: grid.x / 2 + borderMargin,
+              y: -grid.y / 2 - borderMargin,
+            },
+            {
+              x: grid.x / 2 + borderMargin,
+              y: -grid.y / 2 - borderMargin + cornerLine,
+            },
+          ],
+          stroke_width: grid.y / 30,
+        },
+      ]
+      return silkscreenPaths
+    }

src/footprinter.ts

-Original file line number
+Diff line change
@@ Expand Up / @@ -167,6 +167,11 @@ export type Footprinter = { @@
       ) => FootprinterParamsBuilder<
         "w" | "h" | "p" | "pl" | "pw" | "epw" | "eph" | "ep"
       >
+      vson: (
+        num_pins?: number,
+      ) => FootprinterParamsBuilder<
+        "p" | "w" | "grid" | "ep" | "epx" | "pinw" | "pinh"
+      >
       vssop: (
         num_pins?: number,
       ) => FootprinterParamsBuilder<"w" | "h" | "p" | "pl" | "pw">
@@ Expand Down @@

tests/__snapshots__/Texas_VSON-HR-8_1.5x2mm_P0.5mm.snap.svg

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