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AT42QT1481-AU

Microchip Tech · Touch Sensors · TQFP-44(10x10)

AT42QT1481-AU from Microchip Tech, in a TQFP-44(10x10). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	MOSI	input	SPI data input to the QT1481; leave open if unused.
2	MISO	output	SPI data output from the QT1481; leave open if unused.
3	SCK	input	SPI clock input; tie to Vdd if unused.
4	RST	input	Active-low reset with an internal 30 k to 60 k pull-up resistor; the host should control this pin, and tie to Vdd if unused.
5	VDD	power_in	Power supply input; the device operates from +4.75 to 5.25 V.
6	VSS	power_in	Ground reference for the device.
7	XT2	output	Connection for a 16 MHz ceramic resonator or crystal.
8	XT1	input	Connection for a 16 MHz ceramic resonator or crystal.
9	RX	input	UART receive data input; tie to Vdd if unused.
10	TX	output	UART transmit data output with an internal 20 k to 50 k pull-up resistor; leave open if unused.
11	WS	input	Wake-up from sleep input and/or sync input; tie to Vdd if unused.
12	SMP	bidirectional	Sample output pin; no unused-pin connection is specified.
13	Y3A	bidirectional	Y line connection; leave open if unused.
14	Y2A	bidirectional	Y line connection; leave open if unused.
15	Y1A	bidirectional	Y line connection; leave open if unused.
16	Y0A	bidirectional	Y line connection; leave open if unused.
17	VDD	power_in	Power supply input; the device operates from +4.75 to 5.25 V.
18	VSS	power_in	Ground reference for the device.
19	X0	output	X matrix drive line; leave open if unused.
20	X1	output	X matrix drive line; leave open if unused.
21	X2	output	X matrix drive line; leave open if unused.
22	X3	output	X matrix drive line; leave open if unused.
23	X4	output	X matrix drive line; leave open if unused.
24	X5	output	X matrix drive line; leave open if unused.
25	X6	output	X matrix drive line; leave open if unused.
26	X7	output	X matrix drive line; leave open if unused.
27	VDD	power_in	Power supply input; the device operates from +4.75 to 5.25 V.
28	VSS	power_in	Ground reference for the device.
29	VDD	power_in	Power supply input; the device operates from +4.75 to 5.25 V.
30	Y0B	bidirectional	Y line connection; leave open if unused.
31	Y1B	bidirectional	Y line connection; leave open if unused.
32	Y2B	bidirectional	Y line connection; leave open if unused.
33	Y3B	bidirectional	Y line connection; leave open if unused.
34	Y4A	bidirectional	Y line connection; leave open if unused.
35	Y4B	bidirectional	Y line connection; leave open if unused.
36	Y5A	bidirectional	Y line connection; leave open if unused.
37	Y5B	bidirectional	Y line connection; leave open if unused.
38	VDD	power_in	Power supply input; the device operates from +4.75 to 5.25 V.
39	VSS	power_in	Ground reference for the device.
40	STATUS / DBG_DATA	output	Active-low status output or debug data output, with an internal 20 k to 50 k pull-up resistor; leave open if unused.
41	DRDY	bidirectional	Open-drain data ready pin with an internal 20 k to 50 k pull-up resistor; it MUST be used, reads 1 when comms are ready, and needs a 100 µs grace period before checking.
42	VREF	power_in	Reference pin that must be connected to Vss.
43	S_SYNC / DBG_CLK	output	Scope synchronization output or debug clock output; leave open if unused.
44	SS	input	SPI slave select with an internal 20 k to 50 k pull-up resistor; leave open if unused.

Key specifications

Parameter	Value
Manufacturer	Microchip Tech
Package	TQFP-44(10x10)
Category	Sensors
Pins	44

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part	Material	Colour / plating	Datasheet says	Page
housing	abs		When a finger is sensed, the signal falls since the human body acts to absorb charge from the cross-coupling	40
contacts		gold	AT42QT1481-AU QS738 44-pin 10 × 10 mm TQFP RoHS compliant IC AT42QT1481-AUR QS738 44-pin 10 × 10 mm TQFP RoHS compliant IC - Tape and reel	62

CAD (KiCad official)

Symbol: AT42QT1481-AU
Footprint: Package_QFP:TQFP-44_10x10mm_P0.8mm
3D model: TQFP-44(10x10) (KiCad packages3D, STEP)
3D model files: at42qt1481-au-etched.step / at42qt1481-au-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); at42qt1481-au.step / at42qt1481-au.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Microchip Tech datasheet (73 pp, sha256 da52e2df9b963a9f, retrieved 2026-10-28, tier: manufacturer)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF