# Pico SLE4442 Emulator ## Description RP2040 Raspberry Pi Pico replacement for the ATmega8 SLE4442 emulator, using PIO and protected 5 V smart-card interfaces. ## Project Details - **Owner:** tmedford3 - **Created:** 8/14/2026 - **Last Updated:** 8/22/2026 - **Visibility:** Public ## Key Components ### D1 — [WE-TVS-82400102](https://www.flux.ai/kicad-part-library/we-tvs-82400102~vb9.md) - Manufacturer Name: Texas Instruments Inc. - Role: ESD Protection - Role Details: 2.5pF max/channel protection for RESET and CLOCK; VDD tied to card +5V, GND to ground - Datasheet URL: https://www.we-online.com/components/products/datasheet/82400102.pdf - Functional Group: Card Connector,5V Level Interface - Package or Case Code: SOT-23-6 - Manufacturer Part Number: WE-TVS-82400102 **Pins:** - ~ [pin 5] - ~ [pin 1] - ~ [pin 4] - ~ [pin 2] - ~ [pin 3] - ~ [pin 6] ### D2 — [WE-TVS-82400102](https://www.flux.ai/kicad-part-library/we-tvs-82400102~vb9.md) - Manufacturer Part Number: WE-TVS-82400102 - Package or Case Code: SOT-23-6 - Functional Group: Card Connector,5V Level Interface - Datasheet URL: https://www.we-online.com/components/products/datasheet/82400102.pdf - Role Details: 2.5pF max/channel protection for DATA and AUX1; preserves high-frequency margin - Manufacturer Name: Texas Instruments Inc. - Role: ESD Protection **Pins:** - ~ [pin 5] - ~ [pin 1] - ~ [pin 4] - ~ [pin 2] - ~ [pin 3] - ~ [pin 6] ### D3 — [WE-TVS-82400102](https://www.flux.ai/kicad-part-library/we-tvs-82400102~vb9.md) - Role Details: 2.5pF max/channel protection for AUX2 and VPP; VDD rail pin clamps to card +5V. All inputs suitable for several-hundred-kHz margin. - Datasheet URL: https://www.we-online.com/components/products/datasheet/82400102.pdf - Role: ESD Protection - Functional Group: Card Connector,5V Level Interface - Package or Case Code: SOT-23-6 - Manufacturer Part Number: WE-TVS-82400102 - Manufacturer Name: Texas Instruments Inc. **Pins:** - ~ [pin 5] - ~ [pin 1] - ~ [pin 4] - ~ [pin 2] - ~ [pin 3] - ~ [pin 6] ### J2 — ISO7816_EMULATOR_CONTACTS_8 - Mount: PCB - Functional Group: Card Connector - Part Type: Connectors - Role: Smart Card Contact Interface - Connector Positions: 8 - Manufacturer Name: Custom for tmedford3 - Role Details: C1 VCC, C2 RST, C3 CLK, C4 AUX1, C5 GND, C6 VPP, C7 I/O, C8 AUX2; footprint copies original KiCad-derived emulator contact geometry. **Pins:** - AUX1 [pin C4] - AUX2 [pin C8] - CLK [pin C3] - GND [pin C5] - I/O [pin C7] - RST [pin C2] - VCC [pin C1] - VPP [pin C6] ### U1 — [Raspberry Pi Pico](https://www.flux.ai/jwace81/raspberry-pi-pico~ib.md) - Manufacturer Name: Raspberry - Datasheet URL: https://datasheets.raspberrypi.com/pico/pico-datasheet.pdf - Power Requirements: VSYS 1.8-5.5V; design allowance about 150mA peak - Role Details: RP2040 Pico module; PIO captures card signals. Power reader +5V into VSYS only; never connect 5V to GPIO. USB VBUS remains isolated from VSYS by Pico onboard Schottky. - Role: Main Controller - Functional Group: Pico MCU - Manufacturer Part Number: SC0915 **Pins:** - 3V3 [pin 36] - 3V3_EN [pin 37] - ADC_VREF [pin 35] - GND [pin 13] - GND [pin 18] - GND [pin 3] - GND [pin 38] - GND [pin 28] - GND [pin 33] - GND [pin 23] - GND [pin 8] - GP0 [pin 1] - GP1 [pin 2] - GP10 [pin 14] - GP11 [pin 15] - GP12 [pin 16] - GP13 [pin 17] - GP14 [pin 19] - GP15 [pin 20] - GP16 [pin 21] - GP17 [pin 22] - GP18 [pin 24] - GP19 [pin 25] - GP2 [pin 4] - GP20 [pin 26] - GP21 [pin 27] - GP22 [pin 29] - GP26 [pin 31] - GP27 [pin 32] - GP28 [pin 34] - GP3 [pin 5] - GP4 [pin 6] - GP5 [pin 7] - GP6 [pin 9] - GP7 [pin 10] - GP8 [pin 11] - GP9 [pin 12] - RUN [pin 30] - VBUS [pin 40] - VSYS [pin 39] ### U2 — [SN74LVC1G07QDBVRQ1](https://www.flux.ai/lcsc/sn74lvc1g07qdbvrq1~ycmy.md) - Part Type: Buffers / Drivers - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2005091811_Texas-Instruments-SN74LVC1G07QDBVRQ1_C507244.pdf - Operating Voltage: 1.65-5.5V VCC; 5.5V tolerant I/O - Package or Case Code: SOT-23-5_L2.9-W1.6-P0.95-LS2.8-BL - Manufacturer Name: TI(德州仪器) - Role Details: Powered at 3.3V; A driven by GP5; Y may be pulled to card +5V and can only sink DATA low. TI Ioff prevents back-powering when unpowered. - Manufacturer Part Number: SN74LVC1G07QDBVRQ1 - JLCPCB Part Class: Extended Part - Product Info Url: https://lcsc.com/product-detail/Logic-Buffers-Drivers-Receivers-Transceivers_Texas-Instruments-Texas-Instruments-SN74LVC1G07QDBVRQ1_C507244.html - Functional Group: 5V Level Interface - LCSC Part Number: C507244 - Role: Open-Drain Level Interface **Pins:** - ANT [pin 2] - GND [pin 3] - NC [pin 1] - VCC [pin 5] - Y [pin 4] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/tmedford3/pico-sle4442-emulator~49](https://www.flux.ai/tmedford3/pico-sle4442-emulator~49).* --- *Generated from [https://www.flux.ai/tmedford3/pico-sle4442-emulator~49](https://www.flux.ai/tmedford3/pico-sle4442-emulator~49)*