BD3702FV-E2

@@ -0,0 +1,69 @@+# BD3702FV-E2++**ROHM Semicon** · Audio Interface ICs · SSOP-28-208mil++BD3702FV-E2 from ROHM Semicon, in a SSOP-28-208mil. 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 | A1 | input | Selector 'A' single-ended audio input, channel 1 (left). Typical input impedance 100 kOhm; DC-blocking cap required. Selectable through the input selector matrix (see Table 1 modes). |+| 2 | A2 | input | Selector 'A' single-ended audio input, channel 2 (right). Rin(A,B,C) typ 100 kOhm. |+| 3 | B1 | input | Selector 'B' single-ended audio input, channel 1. Rin(A,B,C) typ 100 kOhm. |+| 4 | B2 | input | Selector 'B' single-ended audio input, channel 2. Rin(A,B,C) typ 100 kOhm. |+| 5 | C1 | input | Selector 'C' single-ended audio input, channel 1. Rin(A,B,C) typ 100 kOhm. |+| 6 | C2 | input | Selector 'C' single-ended audio input, channel 2. Rin(A,B,C) typ 100 kOhm. |+| 7 | DP1 | input | Selector 'D' differential positive input, channel 1. Ground-isolation amplifier front-end for external stereo input (Rin(D,E) typ 250 kOhm). |+| 8 | DN | input | Selector 'D' differential negative input (shared between D1 and D2 channels). Ground-reference / return for the D-selector isolation-amp inputs. |+| 9 | DP2 | input | Selector 'D' differential positive input, channel 2. Rin(D,E) typ 250 kOhm. |+| 10 | EP1 | input | Selector 'E' fully-differential positive input, channel 1. Rin(D,E) typ 250 kOhm. |+| 11 | EN1 | input | Selector 'E' fully-differential negative input, channel 1. Rin(D,E) typ 250 kOhm. |+| 12 | EN2 | input | Selector 'E' fully-differential negative input, channel 2. Rin(D,E) typ 250 kOhm. |+| 13 | EP2 | input | Selector 'E' fully-differential positive input, channel 2. Rin(D,E) typ 250 kOhm. |+| 14 | MIN | input | Monaural mixing input. Sums into the signal path with +7 dB to -79 dB (1 dB step) attenuation, or -infinity via I2C control. Input impedance typ 27 kOhm; max input 2.2 Vrms at THD+N=1%. |+| 15 | MUTE | input | External compulsory hardware mute input. Forces all outputs muted independent of I2C state (approx. -105 dB typ mute attenuation). |+| 16 | LRST | input | Level-meter reset input. Clears the peak-hold state of the internal I2C-readable level meter. |+| 17 | LOUT | output | Level-meter DC output. DC voltage proportional to input level (Vmax typ 3.1 V, offset typ 0 mV) for driving an external analog meter. |+| 18 | OUTS2 | output | Subwoofer output, channel 2. Rout typ 50 Ohm; Vom typ 2.2 Vrms at THD+N=1%. Fed from the LPF (fc 55/85/120 Hz) with 0/180 deg phase select. |+| 19 | OUTS1 | output | Subwoofer output, channel 1. Rout typ 50 Ohm; Vom typ 2.2 Vrms at THD+N=1%. |+| 20 | OUTR2 | output | Rear stereo output, channel 2. Post fader/EQ/loudness path; Rout typ 50 Ohm. |+| 21 | OUTR1 | output | Rear stereo output, channel 1. Post fader/EQ/loudness path; Rout typ 50 Ohm. |+| 22 | OUTF2 | output | Front stereo output, channel 2. Post fader/EQ/loudness path; Rout typ 50 Ohm. |+| 23 | OUTF1 | output | Front stereo output, channel 1. Post fader/EQ/loudness path; Rout typ 50 Ohm. |+| 24 | VCC | power_in | Analog power supply. Operating range 7.0-9.5 V (abs max 10.0 V). Iq typ 48 mA (no signal). Bypass to GND with a short-return decoupling capacitor. |+| 25 | SCL | input | I2C bus serial clock input. Compatible with 3.3 V or 5 V I2C logic levels. Requires external pull-up. |+| 26 | SDA | bidirectional | I2C bus serial data line. Compatible with 3.3 V or 5 V I2C logic. Open-drain; requires external pull-up. |+| 27 | GND | power_in | Analog / signal ground. Single-point connect all grounds here; keep decoupling loop short. |+| 28 | FIL | passive | VCC/2 mid-supply reference / filter pin. Connect an external bypass capacitor to GND to filter the internal VCC/2 bias used by the audio signal path. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | ROHM Semicon |+| Package | SSOP-28-208mil |+| Category | Interface |+| Pins | 28 |++## Ordering variants++Same part, different packaging or reel option.++- `BD3702FV-E2`++## CAD (KiCad official)++- Symbol: `BD3702FV-E2`+- Footprint: `Package_SO:SSOP-28_5.3x10.2mm_P0.65mm`+- 3D model: SSOP-28-208mil (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [ROHM Semicon datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588884666576855040) (36 pp, sha256 `0e02483cd0911e8c`, retrieved 2026-08-17, 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](docs/bd3702fv-e2-datasheet.pdf)

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