component
CI523
Public Made by Adomby adom
Nanjing Zhongke Microelectronics RFID ICs, TQFN-16-EP(3x3). Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownCI523
Nanjing Zhongke Microelectronics · RFID ICs · TQFN-16-EP(3x3)
CI523 from Nanjing Zhongke Microelectronics, in a TQFN-16-EP(3x3). 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 | VDD1 | power_in | PVDD power supply input (2.3V to 4.0V nominal); provides pin power supply to the chip |
| 2 | NRSTPD | input | Reset and power-down input; low level enables power-down mode (closes internal current and oscillator, disconnects input pins), rising edge triggers reset |
| 3 | VDD2 | unconnected | Floating pin; leave unconnected (not used in QFN16 variant) |
| 4 | TX1 | output | Transmitter 1 modulated carrier signal output for antenna driver |
| 5 | VDD3 | power_in | TVDD transmitter power supply (2.3V to 4.0V nominal); powers output stages of TX1 and TX2 |
| 6 | TX2 | output | Transmitter 2 modulated carrier signal output for antenna driver |
| 7 | VDD4 | power_in | AVDD analog power supply (2.3V to 4.0V nominal); provides power to analog circuit blocks |
| 8 | VMID | power_in | Internal reference voltage; requires bypass capacitor to ground for stability |
| 9 | RX | input | RF signal input from antenna tuning circuit; 13.56 MHz ISO/IEC 14443 A/B signals |
| 10 | OSCIN | input | Crystal oscillator inverting amplifier input or external 27.12 MHz clock input (fclk = 27.12 MHz) |
| 11 | OSCOUT | output | Crystal oscillator inverting amplifier output for 27.12 MHz crystal connection |
| 12 | MISO | output | SPI master input, slave output; data output from chip to SPI master (max 10 Mbit/s) |
| 13 | MOSI | input | SPI master output, slave input; data input from SPI master to chip (max 10 Mbit/s) |
| 14 | SCK | input | SPI serial clock input from master; max frequency 10 MHz |
| 15 | NSS | input | SPI chip select input (active low); must be held low during SPI transaction |
| 16 | IRQ | output | Interrupt request output indicating interrupt events; configurable as open-drain or CMOS push-pull via IRQPushPull bit |
| 17 | VSS | power_in | Chip ground connection including exposed metal pad at package bottom; primary ground reference (0V) |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Nanjing Zhongke Microelectronics |
| Package | TQFN-16-EP(3x3) |
| Category | RF And Wireless |
| Pins | 17 |
CAD (KiCad official)
- Symbol:
CI523 - Footprint:
Package_DFN_QFN:QFN-16-1EP_3x3mm_P0.5mm_EP1.7x1.7mm - 3D model: TQFN-16-EP(3x3) (KiCad packages3D, STEP)
- 3D model files:
ci523-etched.step/ci523-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ci523.step/ci523.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Nanjing Zhongke Microelectronics datasheet (46 pp, sha256
64022a798c9b7ada, retrieved 2026-09-22, 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: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-4-6(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).