Part Review and Datasheet Update

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I’ll inspect the part metadata, locate the official datasheet if needed, update the Datasheet property, then compare symbol/footprint/pins against the datasheet and summarize mismatches.

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Completed the IQS550-BL-QNR part review and added the official Azoteq datasheet URL: https://www.azoteq.com/images/stories/pdf/iqs5xx-b000_trackpad_datasheet.pdf.
I created the full review report in the project document part-review-iqs550-bl-qnr. Main findings: pin count and pin numbering match the datasheet; key flags are missing explicit pin descriptions, ~RST differing from datasheet NRST, RxB pins needing better ProxSense-note descriptions, and footprint geometry needing a dimensional check because the inspected layout output exposed pad count but not pad dimensions.
Suggested next steps:
  • Add datasheet-derived Pin Description properties to all terminals.
  • Add manufacturer/package/voltage/temperature metadata.
  • Verify the QFN(7x7)-48 footprint geometry against datasheet Figure 11.2 before publishing.
Fix metadata and verify
Add pin descriptions
Update part metadata
Verify footprint geometry
Run ERC DRC

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Part Review: IQS550-BL-QNR
Date: 2026-06-30
Source Data Reviewed
  • Project: silicon-yard/iqs550-bl-qnr
  • Published part UID: fa6aac0d-d94a-4be0-b5f7-5f93992c68c5
  • MPN property: IQS550-BL-QNR
  • Project description: 2.1 / IPC-7351B / 0.6mm / AZOTEQ
  • Datasheet URL added: https://www.azoteq.com/images/stories/pdf/iqs5xx-b000_trackpad_datasheet.pdf
  • Official source: Azoteq IQS550 product page / Azoteq-hosted IQS550/572/525-B000 Datasheet, Rev. 2.1, September 2019
Datasheet Key Specs
  • Manufacturer: Azoteq
  • Device family: IQS5xx-B000 projected capacitive trackpad/touchscreen controller
  • Ordering code: IQS550-BL-QNR
    • IQS550: IQS550 device
    • BL: Bootloader, ready for application firmware programming; B000 firmware not pre-loaded
    • QN: QFN(7x7)-48 package
    • R: reel packaging, 2500 pcs/reel
  • Package: QFN(7 mm x 7 mm), 48 perimeter pins + exposed pad
  • Recommended exposed pad: connect/solder back-side pad to PCB ground
  • Supply voltage: VDDHI 1.65 V to 3.6 V
  • Temperature range: -40 °C to +85 °C ambient
  • Max channels for IQS550: 150
  • Typical report rate: 100 Hz with single touch / all channels active
  • Max resolution: 3584 x 2304 for 15 x 10 configuration
  • Interface: I2C, default 7-bit address 0b1110100 (0x74); address byte 0xE8 write / 0xE9 read
  • I2C modes: Standard 100 kHz and Fast 400 kHz timing limits given
  • Package MSL: 3
  • ESD: HBM 2000 V rated; datasheet notes device sustained up to 3000 V during ESD trials; CDM 1000 V
Symbol Pin Cross-Check
The schematic contains 49 terminal components, matching the expected 48 QFN pins plus exposed pad.

Table

PinDatasheet nameProject symbol nameResultNotes
1Tx14TX14OKCase-only difference
2PGMPGMOKProgramming pin
3SW_INSW_INOKWake/switch input
4n/cNCOKOne of two NC pins
5SDASDAOKI2C data
6SCLSCLOKI2C clock
7VDDHIVDDHIOKSupply voltage
8VSSVSSOKGround reference
9VREGVREGOKInternal regulator voltage
10NRST~RSTAcceptableEquivalent active-low reset notation, but differs from datasheet name
11RDYRDYOKI2C RDY
12n/cNCOKOne of two NC pins
13Rx0ARX0AOKCase-only difference
14Rx0BRX0BOKCase-only difference
15Rx1ARX1AOKCase-only difference
16Rx1BRX1BOKCase-only difference
17Rx2ARX2AOKCase-only difference
18Rx2BRX2BOKCase-only difference
19Rx3ARX3AOKCase-only difference
20Rx3BRX3BOKCase-only difference
21Rx4ARX4AOKCase-only difference
22Rx4BRX4BOKCase-only difference
23Rx5ARX5AOKCase-only difference
24Rx5BRX5BOKCase-only difference
25Rx6ARX6AOKCase-only difference
26Rx6BRX6BOKCase-only difference
27Rx7ARX7AOKCase-only difference
28Rx7BRX7BOKCase-only difference
29Rx8ARX8AOKCase-only difference
30Rx8BRX8BOKCase-only difference
31Rx9ARX9AOKCase-only difference
32Rx9BRX9BOKCase-only difference
33Tx0TX0OKCase-only difference
34Tx1TX1OKCase-only difference
35Tx2TX2OKCase-only difference
36Tx3TX3OKCase-only difference
37VSSIOVSSIOOKI/O ground reference
38VDDIOVDDIOOKI/O supply voltage
39Tx4TX4OKCase-only difference
40Tx5TX5OKCase-only difference
41Tx6TX6OKCase-only difference
42Tx7TX7OKCase-only difference
43Tx8TX8OKCase-only difference
44Tx9TX9OKCase-only difference
45Tx10TX10OKCase-only difference
46Tx11TX11OKCase-only difference
47Tx12TX12OKCase-only difference
48Tx13TX13OKCase-only difference
49Exposed padEXPOKDatasheet recommends connect to PCB ground
Footprint Cross-Check
  • Project footprint/pads present: 49 pads plus footprint containers/shapes.
  • Datasheet package: QFN(7x7)-48 with exposed pad, so the pad count matches.
  • Datasheet recommended landing pattern:
    • Pitch P: 0.50 mm
    • Perimeter pad width W: 0.30 mm
    • Perimeter pad length/height H: 0.55 mm
    • Overall footprint spans: X2/Y2 7.30 mm, X1/Y1 6.20 mm, inner X/Y 5.60 mm
    • Exposed pad: X3 5.80 mm, Y 5.60 mm in datasheet table/figure context
    • Gap g: 0.20 mm
  • The project layout inspection exposed pad count and pad designators, but did not expose detailed pad geometry in the readout. Therefore, footprint dimensions and IPC-7351B toe/heel/side fillet compliance were not numerically verified from the tool output.
Mismatches / Issues Flagged
  1. Datasheet URL was missing — fixed by adding the official Azoteq PDF URL to the project Datasheet URL property.
  2. Pin descriptions are incomplete in the symbol — the terminals have pin numbers and pin types, but no explicit Pin Description properties. Datasheet descriptions should ideally be added, especially for VREG, RDY, SW_IN, PGM, VDDHI, VDDIO, VSS, VSSIO, and the RxB pins.
  3. RxB pins are slightly under-described by type — datasheet describes Rx0B through Rx9B as Note1: configurable through I2C as the ProxSense electrode. The project marks them as generic bidirectional pins; electrically usable, but less descriptive than the datasheet.
  4. Reset pin name differs — datasheet uses NRST; symbol uses ~RST. This is semantically acceptable for active-low reset, but exact naming differs.
  5. Project description says 0.6mm — datasheet landing pattern pitch is 0.50 mm. The 0.6 mm value may refer to max package height (H package dimension 0.500–0.600 mm), not pitch. If it was intended as pitch, it is incorrect.
  6. Footprint geometry not fully verified — pad count matches QFN-48+EP, but detailed pad sizes/spacing were not available in the inspected layout output, so dimensions should be checked visually or with a geometry-capable footprint export/review.
  • Add Manufacturer Name: Azoteq, Package or Case Code: QFN(7x7)-48, and optionally Operating Voltage: 1.65–3.6 V, Operating Temperature: -40 to 85 °C if supported on the published part metadata.
  • Add Pin Description text matching the datasheet pin table.
  • Consider renaming ~RST to NRST or nRST if exact datasheet naming is preferred.
  • Verify footprint pad geometry against datasheet Figure 11.2 dimensions before publishing/reuse in PCB designs.

  • Source Data Reviewed

  • Datasheet Key Specs

  • Symbol Pin Cross-Check

  • Footprint Cross-Check

  • Mismatches / Issues Flagged

  • Recommended Cleanup

Documents

Assets

IQS550-BL-QNR

IQS550-BL-QNR

IQS550-BL-QNR.step3D Model
image1.png

image1.png

image1Thumbnail
svg

IQS550-BL-QNR

IQS550-BL-QNR Symbol.svgDefault

IQS550-BL-QNR

IQS550-BL-QNR thumbnail
2.1 IPC-7351B 0.6mm AZOTEQ

Properties

IQS572B000LQNR

Azoteq

Integrated Circuit

azoteq.com/images/stories/pdf/iqs5xx-b000_trackpad_datasheet.pdf

U

parametric-v1

Pricing & Availability

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