DS3231M+TRL - ±5ppm I2C RTC in 16-SOIC | Analog Devices
MPN： DS3231M+TRL ✓ 啟用中DS3231M+TRL 概覽
A real-time clock is a timekeeping integrated circuit that preserves date and time information independently of a system's main processor. The DS3231M belongs to the RTC, clock-and-calendar, timekeeping IC, and power-management semiconductor hierarchy. Unlike a simple oscillator, an RTC maintains structured calendar information and typically includes an I2C host interface so embedded software can read or set the current time.
The DS3231M+TRL's headline advantage is its specified ±5 ppm frequency accuracy. The integrated MEMS resonator replaces a discrete quartz crystal while reducing assembly component count. Its 2.3 V to 5.5 V supply range permits operation in both 3.3 V and 5 V systems. A dedicated battery input preserves timekeeping during main-power loss, and the I2C interface connects directly to a host microcontroller or other embedded controller.
The 16-SOIC package is specified as WSOIC-16 by one distributor listing, with a listed body width of 7.50 mm. The verified component description identifies the device as an alarm RTC using day, date, month, year, hour, minute, and second date-time formatting. These characteristics make it appropriate for systems where time must remain traceable across power cycles without relying entirely on a network time service.
Typical applications include industrial controllers, data-acquisition equipment, embedded instruments, access-control terminals, and compact sensor nodes. In each case, the RTC supplies a local time reference while the system processor performs measurement, control, logging, or communication. Its I2C interface avoids the use of many discrete I/O lines and is especially useful in designs where board area and component count are constrained.
Designers should treat the battery path as a power-reliability feature rather than a substitute for a fully specified primary supply. I2C pull-up resistors, bus speed, and address selection must be checked against the host system. Because the exact exposed-pad and pin-level details were not included in the supplied verified data, engineers should confirm the complete land pattern and pin assignment against the manufacturer datasheet before layout release.
This page consolidates verified manufacturer and distributor information, supply references, comparison parameters, and practical selection guidance for engineers evaluating the DS3231M+TRL. It also distinguishes directly comparable same-family parts from alternatives that require different packages or functional verification, avoiding unsupported drop-in claims.
直接替換替代品，適用於 DS3231M+TRL — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： DS3231M+TRL （相同外形與佔位） — 差異在於 Package, Mounting Type, Interface, Accuracy, Operating Temperature Range.
DS3231M+
✅ 直接替換聯絡詢價
查看資料表 →DS3231M+TRL 規格
| Accuracy | ±5 ppm |
| Supply Voltage Range | 2.3 V to 5.5 V |
| 工作溫度範圍 | -40°C to +85°C |
| 介面 | I2C, 2-wire serial |
| RTC Function | Real-time clock with clock and calendar |
| Alarm Function | Alarm RTC |
| Time Format | Day, date, month, year, hour, minute, and second |
| Timekeeping Source | Integrated MEMS resonator |
| Backup Power | Battery input |
| Power-Off Timekeeping | Maintains accurate timekeeping when main power is interrupted |
| 封裝 | 16-SOIC, listed as WSOIC-16 |
| Package Width | 7.50 mm |
| Package Length | 0.295 inch |
| 安裝類型 | Surface mount |
| MSL 等級 | 3 (168 hours) |
| RoHS Compliance | ROHS3 compliant |
| REACH Status | Unaffected |
| Component Category | Industrial, General |
DS3231M+TRL 0.295 inch 腳位配置指南
DS3231M+TRL（0.295 inch 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： DS3231M+TRL.
請參閱 資料表 以查看完整腳位配置。
典型應用
DS3231M+TRL 適用於 6 應用s: Industrial Data-Acquisition Systems, Embedded Environmental Monitoring, Access-Control and Security Terminals, Test and Measurement Instruments, Battery-Powered Sensor Nodes, Networked Control and Communication Equipment.
Industrial Data-Acquisition Systems
The DS3231M+TRL is well suited to industrial data-acquisition equipment that must timestamp samples even when the main supply is unavailable. Its ±5 ppm accuracy provides a substantially tighter time base than a general-purpose RC oscillator, while the integrated MEMS resonator removes the need to source and tune a discrete crystal. A host processor can read date and time through the I2C interface and attach precise timestamps to logged measurements. The 2.3 V to 5.5 V operating range supports both 3.3 V and 5 V instrumentation. The battery input allows the clock to continue counting time during a controlled power interruption, although backup endurance must be calculated from the selected cell and operating temperature.
推薦
Embedded Environmental Monitoring
Environmental monitoring nodes can use the DS3231M+TRL as a local event-time reference when measurements must be correlated across multiple remote stations. The ±5 ppm rating and integrated MEMS resonator support consistent long-duration timekeeping without the external crystal and trimming components usually associated with a discrete oscillator. Its I2C interface shares two signal lines with sensors and the host controller, conserving connector pins in compact installations. The 2.3 V to 5.5 V range accommodates battery-regulated and 5 V-derived rails. During a field-service shutdown, the backup battery preserves the time base so that the restored controller can establish an accurate sequence of events instead of restarting with an unknown date.
推薦
Access-Control and Security Terminals
Access-control terminals benefit from the DS3231M+TRL because credential events, maintenance periods, and configuration changes often need a trusted local timestamp. The device stores calendar information through the I2C interface and continues timekeeping from its battery input when the terminal's main supply drops, improving audit continuity across short power interruptions. Its ±5 ppm specification is appropriate for systems that log event sequences, while the 16-SOIC package keeps routing manageable on a dense controller board. The design must still define the backup-cell chemistry and low-power behavior, and firmware should synchronize the RTC against a trusted network source when available rather than treating the local clock as an authoritative external reference.
推薦
Test and Measurement Instruments
The DS3231M+TRL can support calibrated event logs, trigger records, and configuration histories in bench instruments and field-test equipment. The specified ±5 ppm time base allows the host controller to annotate measurements using the device's calendar and clock registers, while the integrated MEMS resonator reduces the external oscillator component count. Because the I2C bus is used for both configuration and time access, firmware should isolate the RTC transactions and protect the bus against unintended address conflicts. The 2.3 V to 5.5 V operating range provides flexibility between 3.3 V analog sections and 5 V digital sections. For metrology-grade traceability, the RTC timestamp should complement, rather than replace, calibration metadata and synchronization from the measurement system.
推薦
Battery-Powered Sensor Nodes
Battery-powered sensor nodes can retain wall-clock time with the DS3231M+TRL when main power is removed. The device's specified ±5 ppm accuracy gives the node a more stable reference than a software-generated timestamp, and the integrated MEMS resonator reduces board component count compared with a discrete crystal implementation. The I2C interface allows the host to query time and calendar registers on demand rather than operating a separate counter. Its 2.3 V to 5.5 V range supports low-voltage regulated rails and 5 V auxiliary rails. Power-budget calculations must include primary operating current, backup current, and battery self-discharge, since the backup interval determines how long useful timekeeping continues without external maintenance.
推薦
Networked Control and Communication Equipment
The DS3231M+TRL is useful in gateway and communications equipment that requires an independent timestamp for event logs and scheduled maintenance records. Its I2C interface allows time data to be shared with a host processor without consuming a separate bus, and the calendar registers simplify firmware implementation compared with a basic monotonic timer. The ±5 ppm specification is suitable for operational logging, while the battery-backed path preserves continuity during brief supply interruptions or controlled resets. Systems should reconcile the local clock with network time when a trusted source is reachable. The RTC's presence does not eliminate the need for protocol authentication, secure time transfer, or tamper detection in applications where manipulated timestamps could affect audit records.
推薦
推薦產品摘要
工程參考資料，適用於 DS3231M+TRL — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | DS3231M+ | DS3231SN# | DS3231 |
|---|---|---|---|---|
| Package | 16-SOIC | 16-SOIC - same package | 16-SOIC - same package | 16-SOIC - same package |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Interface | I2C, 2-wire serial | I2C, 2-wire serial | I2C, 2-wire serial | I2C |
| Timekeeping Source | Integrated MEMS resonator | Integrated MEMS resonator | Quartz crystal | Quartz crystal |
| Backup Power | Battery input | Battery input | Battery-backed RTC | Battery-backed RTC |
| Calendar and Clock | Day, date, month, year, hour, minute, and second | Clock and calendar | Clock and calendar | Clock and calendar |
主要差異化特點
- MEMS-resonator time base reduces external oscillator component count (對比DS3231SN#)
- Wide 2.3 V to 5.5 V operating range supports mixed-voltage systems (對比DS3231)
- Battery-backed calendar continuity during main-power interruption (對比DS3231M+)
設計說明
Treat the battery input as a continuity path rather than a substitute for the primary supply. Select the backup cell using the required offline interval, cell leakage, self-discharge, and the DS3231M backup-current specification from the manufacturer datasheet. Confirm the primary operating and backup voltage ranges before adding a charging circuit, and verify that the selected chemistry is compatible with the battery-input limits.
Place the RTC and its required bypass capacitance close to the device's supply and ground pins, while keeping the I2C traces short and away from high-current switching nodes. Pull-up resistors should be placed where they minimize the exposed bus length without preventing the host's own pull-ups from creating excessive parallel resistance. Review the complete pin table and recommended layout in the official datasheet before releasing the PCB.
Do not assume that DS3231M+TRL and DS3231SN# are interchangeable solely because both use a 16-SOIC package. The verified comparison data identifies a different crystal implementation in DS3231SN#, so pin compatibility, frequency accuracy, aging, backup behavior, and environmental qualification must be checked. The same warning applies to DS3231, whose non-M time base differs from the MEMS-resonator-based DS3231M.
The I2C bus carries both clock and calendar access, so firmware should avoid unnecessary polling and verify that bus capacitance and pull-up resistance remain appropriate for the board length. If the RTC shares the bus with slow-power peripherals, confirm that address mapping and pull-up strength do not prevent valid high levels at the DS3231M input. A scope measurement of SCL and SDA is advisable during first-article bring-up.
合規資訊
The verified component cross-reference identifies DS3231M+TRL as ROHS3 compliant, REACH unaffected, and MSL 3 with a 168-hour floor-life rating. No verified AEC-Q100, halogen-free, or conflict-minerals statement was supplied.
