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Microchip Technology AT24CSW020-UUM0B-T
- Part No.:
- AT24CSW020-UUM0B-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 4-XFBGA, WLCSP
- Datasheet:
-
AT24CSW020-UUM0B-T.pdf
- Description:
- IC EEPROM 2KBIT I2C 1MHZ 4WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:90,827
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Product details
Overview
AT24CSW020-UUM0B-T from Microchip Technology (formerly Atmel) is a 2-Kbit I²C-compatible serial EEPROM with integrated security register, software write protection, and ultra-thin 4-ball WLCSP package. It operates from 1.7V to 3.6V, supports 1MHz Fast Mode Plus, delivers ≤1mA active current and ≤0.8μA standby current, and features a factory-programmed 128-bit unique serial number for secure device identification in embedded systems.
For engineers reviewing the AT24CSW020-UUM0B-T datasheet, AT24CSW020-UUM0B-T pinout, AT24CSW020-UUM0B-T application, or AT24CSW020-UUM0B-T equivalent, this page provides verified technical context, real-world use cases, validated alternatives, and supply-chain support for industrial IoT node authentication, medical device calibration storage, and secure firmware parameter retention.
Technical Context
The AT24CSW020-UUM0B-T implements a true I²C slave interface with Schmitt-triggered, noise-filtered SDA/SCL inputs, supports standard (100kHz), fast (400kHz), and fast-plus (1MHz) modes, and uses an 8-bit device address with fixed 1010b type identifier and preprogrammed A2:A0 = 000 (UUM0B suffix). Its memory map comprises 256 × 8-bit main EEPROM (0000h–00FFh) plus a 32-byte security register (80h–9Fh) split into read-only serial number (80h–8Fh) and user-programmable lockable region (90h–9Fh).
Write protection is managed via a dedicated 8-bit register enabling five configurable block-lock levels; protection can be made permanent via software sequence. The security register supports lock command execution (0110xxxx word address) and status verification, while all writes-including byte, page (8-byte), and security register-complete in ≤5ms with self-timed internal programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2-Kbit (256 × 8-bit) main EEPROM + 256-bit security register (32 bytes) |
| Supply Voltage | 1.7V to 3.6V - enables direct interfacing with 1.8V/2.5V/3.3V microcontrollers without level shifters |
| I²C Speed Modes | 100kHz (Std), 400kHz (Fast), 1MHz (Fast Plus) - supports high-throughput configuration updates in time-critical systems |
| Write Endurance | 1,000,000 cycles - ensures reliable logging of infrequent but critical events over 10+ years of field operation |
| Data Retention | 100 years at 25°C - guarantees long-term integrity of calibration data, cryptographic keys, or device identity |
| Active/Standby Current | ≤1mA active, ≤0.8μA standby - minimizes battery drain in always-on edge sensors and wearable devices |
| Security Register | 128-bit factory-unique serial number (read-only) + 16-byte user EEPROM (lockable) - eliminates need for external serialization hardware |
Pinout & Package
AT24CSW020-UUM0B-T is housed in a 4-ball Ultra-Thin Wafer-Level Chip Scale Package (WLCSP), footprint code 4U-13, measuring 1.0mm × 1.0mm × 0.36mm (max), suitable for space-constrained portable and implantable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Accepts 1.7V–3.6V; must be decoupled with ≥100nF ceramic capacitor near package |
| GND | Ground reference | System ground return path; requires low-impedance connection to minimize noise coupling |
| SCL | Serial clock input | Open-drain compatible; requires external pull-up resistor (1kΩ–10kΩ) to VCC; clocks data on rising edge |
| SDA | Serial data bidirectional I/O | Open-drain; shared bus line; requires same pull-up as SCL; latched on SCL rising edge, driven on falling edge |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set hardware slave address | A2:A1:A0 = 000 encoded in part number UUM0B; eliminates address conflict in multi-device I²C buses |
| Software write protection with five levels | Configurable block locking (0%, 25%, 50%, 75%, 100% of main array); prevents accidental overwrite of critical firmware parameters |
| 256-bit security register | 128-bit unique serial number (ROM) + 16-byte user EEPROM (lockable); enables zero-touch device provisioning and anti-cloning |
| Ultra-low power consumption | 0.8μA standby current allows >10-year battery life in coin-cell-powered asset trackers and smart meters |
| Page write mode (8-byte) | Reduces I²C transaction overhead by 8× vs. byte writes; accelerates bulk configuration loading in production test environments |
Applications
| Medical Device Calibration Storage | Industrial Sensor Node Identity |
|---|---|
Use Scenario: Storing factory-calibrated sensor offset/gain coefficients and temperature compensation tables in portable blood glucose monitors and ECG patches. IC Role / Device Role / Timing Role: Nonvolatile configuration storage with guaranteed 100-year data retention and tamper-resistant serial number for regulatory traceability. Use Value: Eliminates recalibration during device lifetime; serial number enables FDA UDI compliance without adding discrete ID chips or firmware overhead. |
Use Scenario: Assigning unique identifiers and storing network credentials (e.g., LoRaWAN DevEUI, AES keys) in wireless vibration sensors deployed on factory machinery. IC Role / Device Role / Timing Role: Secure identity anchor and credential vault; leverages factory-programmed serial number and lockable user EEPROM. Use Value: Prevents credential cloning across nodes; lockable region ensures keys remain immutable after first boot, meeting IEC 62443-3-3 SL2 requirements. |
| Smart Energy Meter Firmware Parameters | Automotive Body Control Module Settings |
Use Scenario: Retaining tariff schedules, metering constants, and utility-specific configuration flags in ANSI C12.22-compliant smart meters operating across 1.7–3.6V supply range. IC Role / Device Role / Timing Role: Low-voltage EEPROM with 1MHz I²C interface for rapid parameter updates during firmware OTA; supports partial page writes. Use Value: Enables sub-100ms configuration reload during power brownouts; 1.7V operation ensures functionality during battery backup transitions. |
Use Scenario: Storing seat position memory, mirror presets, and lighting profiles in automotive BCMs where space and power are constrained. IC Role / Device Role / Timing Role: Compact, AEC-Q200–compatible (via qualification of WLCSP process) nonvolatile storage with <0.8μA sleep current. Use Value: Reduces PCB area by 70% vs. SOIC-8 EEPROMs; ultra-low standby draw extends vehicle battery life during extended parking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24CSW020-SSHM-T | Same die, 8-pin SOIC package (4.9mm × 6.0mm); higher profile; no WLCSP thermal/mechanical constraints | Better suited for manual assembly, prototyping, or legacy board designs requiring through-hole or SOIC footprints | Select when board rework, hand-soldering, or thermal cycling reliability under mechanical stress is prioritized over size |
| M95M02-DFMN6TP | 2-Mbit SPI EEPROM (vs. 2-Kbit I²C); 1.8V–5.5V supply; no security register or factory serial number | Higher density for firmware patch storage; lacks hardware-level device identity and lockable security region | Select only if SPI interface is already dominant in system architecture and cryptographic identity is handled externally |
Compared with AT24CSW020-UUM0B-T, the SOIC-packaged AT24CSW020-SSHM-T trades miniaturization for assembly flexibility, while the M95M02-DFMN6TP offers greater capacity at the cost of losing factory-unique serialization and I²C compatibility - making AT24CSW020-UUM0B-T irreplaceable for compact, identity-critical, I²C-based designs.
Availability
AT24CSW020-UUM0B-T is available at Aetrix Electronics and suitable for medical diagnostics, industrial IoT sensor nodes, and automotive body control modules requiring stable component supply, long-lifecycle assurance, and RoHS-compliant green packaging.
Supply support for AT24CSW020-UUM0B-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microchip Technology acquired Atmel in 2016 and maintains full product support, qualification, and manufacturing continuity for the AT24CSW series.
The AT24CSW020-UUM0B-T belongs to Microchip's CS-series secure serial EEPROM family, designed specifically for applications demanding hardware-rooted device identity, tamper-resistant parameter storage, and ultra-low-power operation in space-constrained environments.
FAQ
What is the factory-programmed hardware address of AT24CSW020-UUM0B-T?
The AT24CSW020-UUM0B-T has a fixed hardware slave address with A2:A1:A0 = 000, encoded in the "UUM0B" suffix. Its full 7-bit address is 1010000b (0x50) for main EEPROM access and 1011000b (0x58) for security register access. This eliminates address conflicts in multi-device I²C systems and is verified in Table 4-1 of the official datasheet.
Does AT24CSW020-UUM0B-T support 1MHz I²C communication?
Yes, AT24CSW020-UUM0B-T fully supports Fast Mode Plus (FM+) at 1MHz across its entire 1.7V–3.6V operating range, as specified in Section 1 "Features" and Table 10-4 (AC Characteristics) of the datasheet. This enables high-speed parameter updates in real-time control loops without protocol bottlenecks.
How is the 128-bit serial number in AT24CSW020-UUM0B-T accessed and protected?
The 128-bit serial number resides in bytes 80h–8Fh of the security register and is read-only, factory-programmed, and permanently locked. It is accessed using device address 0x58 (1011b + A2:A1:A0) and word address 80h. No software command can modify it, ensuring cryptographic binding to the physical die across its lifetime.
Can the user-programmable section of the security register in AT24CSW020-UUM0B-T be permanently locked?
Yes, the upper 16 bytes (90h–9Fh) of the security register in AT24CSW020-UUM0B-T can be permanently write-protected using the Lock Command (word address 0110xxxx). Once locked, no further writes are possible - confirmed in Section 8.3.1 "Lock Command" and Figure 8-1 of the datasheet.
What is the maximum write cycle time for AT24CSW020-UUM0B-T?
The AT24CSW020-UUM0B-T guarantees a maximum self-timed write cycle duration of 5ms for both byte and page writes, as stated in Section 5.4 "Write Cycle Timing" and Table 10-4. This deterministic timing simplifies host MCU firmware design by eliminating polling uncertainty during EEPROM programming sequences.
AT24CSW020-UUM0B-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 4-XFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 2Kbit
- Memory Organization:
- 256 x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 1 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 450 ns
- Voltage - Supply:
- 1.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-WLCSP
AT24CSW020-UUM0B-T FAQ
1.How can I place an order for AT24CSW020-UUM0B-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CSW020-UUM0B-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AT24CSW020-UUM0B-T reliable?
The price and inventory of AT24CSW020-UUM0B-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24CSW020-UUM0B-T is usually 5 days.
3.What payment methods are accepted for AT24CSW020-UUM0B-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CSW020-UUM0B-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CSW020-UUM0B-T?
AT24CSW020-UUM0B-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CSW020-UUM0B-T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AT24CSW020-UUM0B-T?
For technical support, including AT24CSW020-UUM0B-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CSW020-UUM0B-T requirements.
6.How does Aetrix verify that AT24CSW020-UUM0B-T is sourced from the original manufacturer or authorized distributors?
All AT24CSW020-UUM0B-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AT24CSW020-UUM0B-T meets industry standards.
7.What is the process for return or replacement of AT24CSW020-UUM0B-T?
All AT24CSW020-UUM0B-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24CSW020-UUM0B-T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AT24CSW020-UUM0B-T part is unused and in its original packaging.
Return procedure for AT24CSW020-UUM0B-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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