DS2431G+U - 1Kb 1-Wire EEPROM, 2-SFN Package | Analog Devices
MPN: DS2431G+U ✓ Hoạt độngDS2431G+U Tóm tắt
What is a 1-Wire EEPROM? A 1-Wire EEPROM is a non-volatile memory device that uses Maxim's proprietary 1-Wire protocol, which combines power and bidirectional data on a single conductor plus ground. This dramatically simplifies wiring in identification, calibration, and accessory-detect applications by eliminating the multi-pin SPI/I²C bus. The hierarchy is: 1-Wire EEPROM -> serial EEPROM -> non-volatile memory (NVM) -> memory IC -> semiconductor. Each 1-Wire device also carries a unique 64-bit ROM ID, enabling multi-drop addressing on a single bus.
Key features of the DS2431G+U include four 256-bit memory pages that can be individually write-protected or put into EPROM-emulation mode (bits can only change from 1 to 0), a unique factory-lasered 64-bit ROM identification number, 8-byte scratchpad for verified write-then-copy operation, and full compatibility with the 1-Wire protocol used throughout the iButton®/1-Wire ecosystem. The 2-SFN package exposes a single DQ data/power contact and a GND paddle, making it ideal for compact PCB pads or solder-down identification tokens.
Architecturally, the DS2431 uses an on-chip silicon unique-ID ROM (8-byte family code + 6-byte serial number + 1-byte CRC) generated at wafer probe, plus a four-page EEPROM array accessed through an 8-byte SRAM scratchpad. Writes go through the scratchpad with a built-in 8-bit CRC verification before being copied atomically to the target page, which gives robust data integrity for in-field updates.
Typical applications include PCB identification and asset tagging, consumable authentication (ink cartridges, medical disposables, batteries), board-level calibration storage, secure feature enablement, and iButton/1-Wire bus identification nodes. The DS2431G+U is the SFN-packaged member of the broader DS2431 family that also ships in TO-92, TSOC, and TDFN packages.
When designing with the DS2431G+U, ensure the DQ line has a strong pull-up (typically 4.7 kΩ to VPU) for both power delivery and open-drain signaling, and reserve host-side firmware for the MATCH ROM / SKIP ROM / WRITE SCRATCHPAD / READ SCRATCHPAD / COPY SCRATCHPAD command sequence. Strong ESD and surge protection on the DQ contact is recommended for connector-exposed applications; the DS2431 family is well documented in Maxim/Analog Devices Application Note 3829.
This page synthesizes distributor pricing, drop-in package-compatible alternatives, and practical design notes not found in the standalone manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho DS2431G+U — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với DS2431G+U (cùng hình factor và footprint) — khác nhau ở Interface, Memory Organization, Memory Size, Memory Type, Mounting Type.
DS2431G+T
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
DS2431G/V+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
DS2431G+U
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →DS2431GA1+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
DS2431GA3+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
DS2430A+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
DS28EC20+
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →DS2431G+U Tỷ lệ tối đa & tính chất điện
| Kiểu bộ nhớ | EEPROM (Non-Volatile) |
| Kích thước bộ nhớ | 1 Kbit (1024 bits) |
| Memory Organization | 4 pages x 256 bits (32 bytes) |
| Giao diện | 1-Wire® (single-contact DQ + GND) |
| Write Cycle Time | 2 µs (scratchpad write) |
| Scratchpad Size | 8 bytes (64 bits) |
| Unique ROM ID | 64-bit (8-byte family code + 6-byte serial + CRC) |
| Write Protection | Per-page, selectable; EPROM-emulation mode (1→0 only) |
| Hộp | 2-SFN (6.0 mm x 6.0 mm leadless) |
| Nhiệt độ hoạt động | -40 °C to +85 °C |
| Storage Temperature | -55 °C to +125 °C (per datasheet Absolute Maximum Ratings) |
| Supply (Parasite Power via DQ) | 2.8 V to 5.25 V (pull-up VPU) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
| Lead-Free / Halogen-Free | Yes / Yes |
Cấu hình chân DS2431G+U
| Chân 1 | DQ — 1-Wire data and parasite power contact |
| Chân 2 | GND — Ground and exposed bottom pad (thermal/mechanical reference) |
Ứng dụng tiêu biểu
DS2431G+U phù hợp cho 7 Áp dụngs: PCB Identification and Asset Tagging, Consumable Authentication and Anti-Counterfeit, Calibration Data Storage, iButton / 1-Wire Multi-Drop Identification, Accessory Detection and Cartridge Recognition, Industrial Sensor Module Identity, Battery Pack Identification and Cycle Logging.
PCB Identification and Asset Tagging
The DS2431G+U's 64-bit factory-lasered ROM ID and 1024-bit EEPROM make it the canonical 1-Wire tagging device for PCB identification and asset tracking. Soldered onto every board, it lets a host firmware image automatically detect board revision, manufacture date, and MAC/serial assignments via the MATCH ROM and READ ROM commands. Its 2-SFN 6x6 mm land pattern occupies less board area than a TO-92 iButton, fitting beneath BGA shadow regions. The parasite-powered single DQ line keeps BOM cost to one pull-up resistor, suiting high-volume consumer and industrial electronics.
Được đề xuất
Consumable Authentication and Anti-Counterfeit
OEM consumables - printer toner, medical sensors, battery packs, ink cartridges - embed the DS2431G+U as a cryptographic-authentication token. The unique 64-bit ROM ID plus the 1-Kbit EEPROM enable per-unit challenge/response secrets and consumable-life counters in EPROM-emulation mode. The 2 µs scratchpad-write time supports fast in-line production programming. Per-page write protection lets OEMs lock calibration constants while leaving a small region for end-user cycle counters.
Được đề xuất
Calibration Data Storage
Precision analog front ends and sensor modules use the DS2431G+U to store factory calibration coefficients that the host reads at power-up. The four 256-bit pages map neatly to gain, offset, linearity, and lot-traceability records. EPROM-emulation mode provides tamper-evident one-way logging of field events. Because the device rides a single DQ line, calibration is supported on test fixtures without breaking into the main SPI/I2C bus.
Được đề xuất
iButton / 1-Wire Multi-Drop Identification
In door-lock, weighing-scale, or handheld-instrument cradles, the DS2431G+U acts as the identification token while the host uses the DS2482 or DS2480B bridge to poll. Up to dozens of 1-Wire devices can co-exist on a single DQ line because each carries a unique ROM ID resolved by SEARCH ROM. The 2-SFN package supports flat spring-contact probe readers, replacing the older TO-92 iButton footprint for slimmer handheld designs.
Được đề xuất
Accessory Detection and Cartridge Recognition
Modular systems (handheld scanners, medical disposables, vacuum tool heads) use the DS2431G+U in each accessory to advertise its identity, firmware profile, and lifetime counters. Because the device is parasite-powered, the host's cradle connector needs only a single spring-loaded probe, dramatically reducing mechanical BOM and improving ingress-protection ratings. EPROM-emulation mode doubles as a one-way usage counter that cannot be reset by end users.
Được đề xuất
Industrial Sensor Module Identity
Distributed 1-Wire sensor chains in building automation and HVAC use the DS2431G+U to provide unique identity and runtime configuration storage on each node. The 1-Kbit capacity supports a unique 64-bit ID, a sensor type code, calibration coefficients, and a CRC-protected configuration record. Operating temperature -40 °C to +85 °C handles unconditioned plant environments, and the 2-SFN package is far smaller than DS18B20-style TO-92 sensor cans.
Được đề xuất
Battery Pack Identification and Cycle Logging
Smart battery packs include a DS2431G+U to store chemistry, lot code, and a one-way cycle counter using EPROM-emulation mode where each charge cycle burns one bit from 1 to 0. The parasite-powered single-line interface keeps wiring to a single spring contact on the host connector, supporting sealed IP67 battery designs. Page-level write protection lets OEMs lock chemistry/safety fields while leaving the cycle counter writable.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho DS2431G+U — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | DS2431G+T | DS2431G/V+ | DS2430A+ | DS28EC20+ |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 2-SFN (6x6 mm) | 2-SFN (6x6 mm) - same | 2-SFN (6x6 mm) - same | 2-SFN (6x6 mm) - same | 2-SFN (6x6 mm) - same |
| Memory Size | 1 Kbit | 1 Kbit | 1 Kbit | 256 bit (-75%) | 20 Kbit (+1920%) |
| Memory Organization | 4 pages x 256 bits | 4 pages x 256 bits | 4 pages x 256 bits | 1 page x 256 bits | 4 pages x 512 bytes |
| Interface | 1-Wire | 1-Wire | 1-Wire | 1-Wire | 1-Wire |
| Unique ROM ID | 64-bit | 64-bit | 64-bit | 64-bit | 64-bit |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| Programming | 8-byte scratchpad, 2 µs write | 8-byte scratchpad, 2 µs write | 8-byte scratchpad, 2 µs write | 8-byte scratchpad | 32-byte scratchpad |
| RoHS Compliance | Yes | Yes | Yes | Yes | Yes |
Bảo phân biệt quan trọng
- Lowest wire count among all EEPROM categories (vsDS2430A+)
- Higher density than the legacy DS2430A in same footprint (vsDS2430A+)
- Right-sized density (1 Kbit) for typical authentication use cases (vsDS28EC20+)
- Faster scratchpad writes than DS2430A (vsDS2430A+)
- Stable, mainstream 1-Wire family part (vsDS28EC20+)
Ghi chú thiết kế
The DQ contact of the DS2431G+U is the only electrical interface, so PCB land-pattern fidelity is critical. Keep the DQ trace short and away from switching converters to avoid noise during scratchpad writes. Place the 4.7 kΩ pull-up resistor (R_PU) within a few millimeters of the device when possible; long DQ traces can exceed 1-Wire timing budgets on multi-node buses. Use a 4-layer board with a solid ground plane beneath the SFN pad.
If the DQ line is exposed to user contact (cable, battery door, cradle), add a TVS diode (e.g., SMAJ5.0CA) between DQ and GND to protect the open-drain driver and parasite-power rectifier. The DS2431G+U has limited internal ESD rating, so external protection is essential for consumer and medical applications. Keep the TVS capacitance below 100 pF to avoid loading the 1-Wire rise time.
Avoid reading the EEPROM page directly - the host must always go through the 8-byte scratchpad with READ SCRATCHPAD + CRC verification before issuing COPY SCRATCHPAD. Skipping the scratchpad pattern is the #1 cause of silent data corruption in 1-Wire designs. Also, when computing the 8-bit CRC over the scratchpad, use the Maxim polynomial 0x8C (X^8 + X^5 + X^4 + 1), not CRC-16 or CRC-32. Reference Application Note 3829 for full command set.
Estimated: at VPU = 5 V, the DS2431G+U draws approximately 1.5 mA peak during COPY SCRATCHPAD to EEPROM (the worst-case EEPROM write). Ensure the host pull-up can source this current - a passive 4.7 kΩ to 5 V yields about 1 mA which may be marginal. For reliable writes, use an active pull-up (P-MOSFET switched by the host) to deliver a hard 5 V during writes, especially on long cables. Refer to AN-3829 for active-pull-up schematics.
The 2-SFN package is a small thermal mass and self-heating during EEPROM writes is minimal. However, in reflow-profile manufacturing, the exposed bottom pad should receive standard SAC2828 lead-free profile per JEDEC J-STD-020. Hand-soldering is not recommended for production volumes due to the small land area. Use no-clean flux and verify no solder balls bridge the DQ pad to GND.
Thông tin tuân thủ
RoHS and halogen-free per Heisener/Veswin distributor listings and Analog Devices product page. Industrial temperature grade (-40 °C to +85 °C); for AEC-Q100 qualified flow, choose the DS2431G/V+ variant instead.
