XW09A from Sam wing, 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	GND	power_in	Power ground (0V) reference for the chip.
2	C1	passive	Internal balance capacitor interface. Connect an external NPO capacitor (1nF-10nF range, 4.7nF recommended) between this pin and GND.
3	CSEL	passive	Sensitivity adjustment capacitor interface. Connect an external capacitor (0-100pF) between this pin and GND; smaller capacitance yields higher sensitivity, and leaving it open gives maximum sensitivity.
4	PAD0	input	Capacitive touch key input channel 0. Connect to a touch sensing pad (typ. 3-30mm square/round conductor) via a series 1k resistor; leave floating if unused.
5	PAD1	input	Capacitive touch key input channel 1. Connect to a touch sensing pad via a series 1k resistor; leave floating if unused.
6	PAD2	input	Capacitive touch key input channel 2. Connect to a touch sensing pad via a series 1k resistor; leave floating if unused.
7	PAD3	input	Capacitive touch key input channel 3. Connect to a touch sensing pad via a series 1k resistor; leave floating if unused.
8	PAD4	input	Capacitive touch key input channel 4. Connect to a touch sensing pad via a series 1k resistor; leave floating if unused.
9	PAD5	input	Capacitive touch key input channel 5. Connect to a touch sensing pad via a series 1k resistor; leave floating if unused.
10	PAD6	input	Capacitive touch key input channel 6. Connect to a touch sensing pad via a series 1k resistor; leave floating if unused.
11	PAD7	input	Capacitive touch key input channel 7. Connect to a touch sensing pad via a series 1k resistor; leave floating if unused.
12	PAD8	input	Capacitive touch key input channel 8. Connect to a touch sensing pad via a series 1k resistor; leave floating if unused.
13	INT	output	Key-valid interrupt output (open-drain). Asserts low when a touch key is active; requires an external pull-up resistor (typ. 10k) to VDD.
14	SCL	input	I2C serial clock line (up to 400 kbit/s). Requires an external pull-up resistor (typ. 10k) to VDD. XW09A operates as an I2C slave (read-only).
15	SDA	bidirectional	I2C serial data line. Requires an external pull-up resistor (typ. 10k) to VDD. Slave address A[6:0]=0x40 (full 8-bit read address 0x81). Also used as a sleep-cancel input: pulling SDA low at least every 20s keeps the device out of sleep mode.
16	VDD	power_in	Positive supply input. Operating range 2.5V to 5.5V (absolute max 6.0V). Typical operating current 0.8mA @ 3.0V, 1.6mA @ 5.0V; sleep current ~90uA. Decouple with 100nF close to the pin.

Key specifications

Parameter	Value
Manufacturer	Sam wing
Package	SOP-16
Category	Sensor
Pins	16

Ordering variants

Same part, different packaging or reel option.

XW09ASOP16L

CAD (KiCad official)

Symbol: XW09A
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: Sam wing datasheet (6 pp, sha256 6524ad9322c04543, 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