TUSB2036

@@ -0,0 +1,76 @@+# TUSB2036++**Texas Instruments** · USB hub · LQFP-32++Turns one upstream USB port into three downstream ports, in a USB 2.0 full-speed hub. It handles the hub enumeration and per-port connect and power logic itself, with PWRON/OVRCUR pins for each port to switch and monitor downstream power, and a ganged or per-port power mode. It runs bus-powered or self-powered and takes an optional external EEPROM for custom descriptors. A simple, self-contained way to fan out a full-speed USB port.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | DP0 | bidirectional | Root port USB differential data plus. DP0 paired with DM0 constitutes the upstream USB port (full-speed, 12 Mb/s). |+| 2 | DM0 | bidirectional | Root port USB differential data minus. DM0 paired with DP0 constitutes the upstream USB port. |+| 3 | VCC | power_in | 3.3-V supply voltage (recommended 3.0-3.6 V). |+| 4 | RESET | input | Active-low TTL reset input with hysteresis. Must be asserted at power up; recommended pulse width 100 μs-1 ms after VCC reaches 90%. Clock must be active during the last 60 μs of the reset window. |+| 5 | EECLK | output | EEPROM serial clock. When EXTMEM is low, EECLK acts as a 3-state serial clock output to the EEPROM with a 100-μA internal pulldown. When EXTMEM is high the EEPROM interface is disabled and this pin must be left floating. |+| 6 | EEDATA/GANGED | bidirectional | Muxed EEPROM serial data / power-management mode indicator. When EXTMEM is low it is the serial data I/O for the EEPROM (100-μA internal pulldown). When EXTMEM is high it selects ganged vs. per-port overcurrent detection for the downstream ports; TTL input that must not change dynamically during operation. |+| 7 | GND | power_in | Ground reference. Must be tied to ground for proper operation. |+| 8 | BUSPWR | input | Active-low power-source indicator. Pull low for bus-powered mode or to 3.3 V for self-powered mode. Must not change dynamically during operation. |+| 9 | PWRON1 | output | Active-low push-pull power-on/off control for downstream port 1. Drives external 5-V power switch device; output cannot drive 5-V signals so the switch must accept 3.3-V logic inputs. |+| 10 | OVRCUR1 | input | Active-low overcurrent input for downstream port 1. Sampled every 2 ms with noise-filter logic (valid on two consecutive samples). |+| 11 | DM1 | bidirectional | USB downstream port 1 differential data minus. |+| 12 | DP1 | bidirectional | USB downstream port 1 differential data plus. |+| 13 | PWRON2 | output | Active-low push-pull power-on/off control for downstream port 2. Drives external 5-V power switch device (3.3-V compatible input required). |+| 14 | OVRCUR2 | input | Active-low overcurrent input for downstream port 2. Noise-filtered (sampled every 2 ms). |+| 15 | DM2 | bidirectional | USB downstream port 2 differential data minus. |+| 16 | DP2 | bidirectional | USB downstream port 2 differential data plus. |+| 17 | PWRON3 | output | Active-low push-pull power-on/off control for downstream port 3. Drives external 5-V power switch device (3.3-V compatible input required). |+| 18 | OVRCUR3 | input | Active-low overcurrent input for downstream port 3. Noise-filtered; has an internal pull-up that can be enabled for 2-port operation. |+| 19 | DM3 | bidirectional | USB downstream port 3 differential data minus. |+| 20 | DP3 | bidirectional | USB downstream port 3 differential data plus. |+| 21 | OCPROT/PWRSW | input | Dual-function active-low input. On a bus-powered hub (BUSPWR=GND) this is the overcurrent-protection implementation indicator (OCPROT); on a self-powered hub (BUSPWR=VCC) it is the power-switching implementation indicator (PWRSW). Logic high disables the internal pulldown. |+| 22 | NPINT0 | input | Number of ports internal to hub system (permanently attached), bit 0. See Table 1 in datasheet. |+| 23 | NPINT1 | input | Number of ports internal to hub system (permanently attached), bit 1. See Table 1 in datasheet. |+| 24 | NP3 | input | Active-low port-count select. Logic 0 configures the hub for 3 downstream ports; logic 1 configures for 2 downstream ports. |+| 25 | VCC | power_in | 3.3-V supply voltage (recommended 3.0-3.6 V). |+| 26 | EXTMEM | input | External-EEPROM enable. When high, the serial EEPROM interface is disabled and default VID/PID are used. When low, pins 5 and 6 act as the EEPROM clock and data pins. |+| 27 | DP0PUR | output | DP0 pullup-resistor enable. Floats (inactive) for ~15 ms after RESET or after any change on BUSPWR, then drives to VCC (3.3 V) until the next reset or BUSPWR change. Enables onboard bus/self-power dynamic switching. |+| 28 | GND | power_in | Ground reference. Must be tied to ground for proper operation. |+| 29 | XTAL2 | output | 6-MHz crystal output. Leave open when using an external oscillator/clock source. |+| 30 | XTAL1/CLK48 | input | Muxed crystal / 48-MHz clock input. When MODE is low, this is a 6-MHz crystal input (50% duty cycle) driving an internal APLL that generates the 48-MHz and 12-MHz core clocks. When MODE is high, this pin is driven by a 48-MHz external clock and the APLL is bypassed. |+| 31 | MODE | input | Clock-source mode select. Low = APLL output clock (6-MHz crystal or oscillator on XTAL1); high = XTAL1/CLK48 driven directly by a 48-MHz clock source. |+| 32 | SUSPND | output | Suspend-status output. Active-high; asserted high during USB suspend to allow external logic to power down. Low during normal operation. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | USB 2.0 full-speed hub |+| Ports | 1 upstream, 3 downstream |+| Power | Bus- or self-powered |+| Port power | Ganged or per-port (PWRON / OVRCUR) |+| Descriptors | Internal or external EEPROM |+| Supply | 3.3 V |+| Package | LQFP-32 |++## Ordering variants++- `TUSB2036VF (LQFP-32)`+- `TUSB2036IVF (LQFP-32, industrial)`+- `TUSB2036IPT (LQFP-32)`++## CAD (KiCad official)++- Symbol: `Interface_USB:TUSB2036 (KiCad official)`+- Footprint: `Package_QFP:LQFP-32_7x7mm_P0.8mm`+- 3D model: LQFP-32 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/tusb2036.pdf) (29 pp, sha256 `66da8c4b2e0dd932`, retrieved 2026-08-17, tier: manufacturer)+- **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/tusb2036-datasheet.pdf)

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