BL6552

@@ -0,0 +1,72 @@+# BL6552++**BL Shanghai Belling** · Supervisor and Reset ICs · QFN-36-EP(6x6)++BL6552 from BL Shanghai Belling, in a QFN-36-EP(6x6). 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 | INP | input | Neutral-line current channel positive differential input. Max differential voltage per pair ±0.7V. |+| 2 | VREF | bidirectional | Internal 1.2V reference voltage; can be used as reference input or output. Decouple externally. |+| 3 | VAN | input | Phase-A voltage channel negative differential input. Max differential voltage per pair ±0.7V. |+| 4 | VAP | input | Phase-A voltage channel positive differential input. |+| 5 | VBN | input | Phase-B voltage channel negative differential input. Max differential voltage per pair ±0.7V. |+| 6 | VBP | input | Phase-B voltage channel positive differential input. |+| 7 | VCN | input | Phase-C voltage channel negative differential input. Max differential voltage per pair ±0.7V. |+| 8 | VCP | input | Phase-C voltage channel positive differential input. |+| 9 | NRST | input | Active-low reset input. |+| 10 | AGND | power_in | Analog ground. |+| 11 | DGND | power_in | Digital ground. |+| 12 | CS | input | SPI chip-select input when SEL=1; when SEL=0 acts as UART baud-rate select input. |+| 13 | SDO | output | SPI MISO / UART TX output data pin (function selected by SEL). |+| 14 | SDI | input | SPI MOSI / UART RX input data pin (function selected by SEL). |+| 15 | SCLK | input | SPI clock input when SEL=1; when SEL=0 acts as UART baud-rate select input. |+| 16 | IRQ1 | output | Interrupt-status logic output 1. |+| 17 | IRQ2 | output | Interrupt-status logic output 2. |+| 18 | CLKOUT | output | Crystal oscillator output pin (connect to external 8MHz crystal). |+| 19 | CLKIN | input | Crystal oscillator input pin; external crystal frequency 8MHz. |+| 20 | VPP | power_in | Reserved power pin; may be left floating. |+| 21 | CF1 | output | Calibration pulse output 1 (active-power energy pulse). |+| 22 | CF2 | output | Calibration pulse output 2 (reactive-power energy pulse). |+| 23 | AT1 | output | Configurable logic output 1 (programmable status indication). |+| 24 | AT2 | output | Configurable logic output 2 (programmable status indication). |+| 25 | AT3 | output | Configurable logic output 3 (programmable status indication). |+| 26 | DVDD18 | power_out | Internal 1.8V digital LDO output; connect an external 0.1µF filter capacitor to GND. |+| 27 | SEL | input | Interface select input: 0 (default) selects UART, 1 selects SPI. |+| 28 | DVDD | power_in | Digital 3.3V supply input. |+| 29 | AVDD | power_in | Analog 3.3V supply input. |+| 30 | ICN | input | Phase-C current channel negative differential input. Max differential voltage per pair ±0.7V. |+| 31 | ICP | input | Phase-C current channel positive differential input. |+| 32 | IBN | input | Phase-B current channel negative differential input. Max differential voltage per pair ±0.7V. |+| 33 | IBP | input | Phase-B current channel positive differential input. |+| 34 | IAN | input | Phase-A current channel negative differential input. Max differential voltage per pair ±0.7V. |+| 35 | IAP | input | Phase-A current channel positive differential input. |+| 36 | INN | input | Neutral-line current channel negative differential input. Max differential voltage per pair ±0.7V. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | BL Shanghai Belling |+| Package | QFN-36-EP(6x6) |+| Category | PMIC |+| Pins | 36 |++## CAD (KiCad official)++- Symbol: `BL6552`+- Footprint: `Package_DFN_QFN:QFN-36-1EP_6x6mm_P0.5mm_EP3.7x3.7mm`+- 3D model: QFN-36-EP(6x6) (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [BL Shanghai Belling datasheet](docs/bl6552-datasheet.pdf) (80 pp, sha256 `4b18cbf018c6a304`, 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/bl6552-datasheet.pdf)

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