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The M41T8x are low-power serial I2C real-time clocks (RTCs) with a built-in 32.768 kHz oscillator (external crystal-controlled for the QFN16 and SO8 packages, embedded crystal for the SOX18 package). Eight bytes of the register map (see Table 2 on page 23) are used for the clock/calendar function and are configured in binary-coded decimal (BCD) format. An additional 17 bytes of the register map provide status/control of the two alarms, watchdog, 8-bit counter, and square wave functions. An additional seven bytes are made available as user SRAM.
Addresses and data are transferred serially via a two-line, bidirectional I2C interface. The built-in address register is incremented automatically after each WRITE or READ data byte. The M41T8x has a built-in power sense circuit which detects power failures and automatically switches to the battery supply when a power failure occurs. The energy needed to sustain the clock operations can be supplied by a small lithium button battery when a power failure occurs.
Functions available to the user include a non-volatile, time-of-day clock/calendar, two alarm interrupts, watchdog timer, programmable 8-bit counter, and square wave outputs. The eight clock address locations contain the century, year, month, date, day, hour, minute, second, and tenths/hundredths of a second in 24-hour BCD format. Corrections for 28, 29 (leap year), 30, and 31 day months are made automatically. The M41T83 is supplied in either a QFN16 or an SOX18, 300 mil SOIC which includes an embedded 32 KHz crystal. The SOX18 package requires only a user-supplied battery to provide non-volatile operation. The M41T82 is available only in an SO8 package.主要特性
- Ultra-low battery supply current of 365 nA
- Factory-calibrated accuracy of ±5 ppm typical after 2 reflows (SOX18)
- Much better accuracies achievable using built-in programmable analog and digital calibration circuits
- 2.0 V to 5.5 V clock operating voltage
- Counters for tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century
- Automatic switchover and reset output circuitry (fixed reference)
- M41T83S: VCC= 3.00 V to 5.50 V
- M41T83R: VCC= 2.70 V to 5.50 V
- M41T83Z: VCC= 2.38 V to 5.50 V
- Serial interface supports I2C bus (400 kHz protocol)
- Programmable alarm with interrupt function (valid even during battery backup mode)
- Optional 2ndprogrammable alarm available
- Square wave output defaults to 32 KHz on power-up (M41T83 only)
- RESET (RST) output
- Watchdog timer
- Programmable 8-bit counter/timer
- 7 bytes of battery-backed user SRAM
- Battery low flag
- Low operating current of 80 μA
- Oscillator stop detection
- Battery or SuperCap™ backup
- Operating temperature of –40 °C to 85 °C
- Package options
- a 16-lead QFN (M41T83)
- an 8-lead SOIC (M41T82) or
- an 18-lead embedded crystal SOIC (M41T83)
- RoHS compliance: lead-free components are compliant with the RoHS directive
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样片和购买
| 产品型号 | 封装 | 包装类型 | 温度（ºC） | 供货状态 | NVRAM size (B) | ECCN (US) | Country of Origin | 更多信息 | Budgetary Price (US$)*/Qty | 从ST订购 | 从分销商订购 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 最小值 | 最大值 | |||||||||||
| M41T83SMY6F | SO18 with embedded crystal | Tape And Reel | -40 | 85 | 批量生产 | 12 | EAR99 | MALAYSIA | 1.965 / 1k | 获取样片 | 查看供货情况 | |
| M41T83ZMY6F | SO18 with embedded crystal | Tape And Reel | -40 | 85 | 批量生产 | 12 | EAR99 | MALAYSIA | 1.965 / 1k | 获取样片 | 查看供货情况 | |
| M41T83RQA6F | VFQFPN 16 4x4x1.0 | Tape And Reel | -40 | 85 | 批量生产 | 12 | EAR99 | MALAYSIA | 1.318 / 1k | 获取样片 | 查看供货情况 | |
| M41T83ZQA6F | VFQFPN 16 4x4x1.0 | Tape And Reel | -40 | 85 | 批量生产 | 12 | EAR99 | MALAYSIA | 1.318 / 1k | 获取样片 | 查看供货情况 | |
| M41T83SQA6F | VFQFPN 16 4x4x1.0 | Tape And Reel | -40 | 85 | 批量生产 | 12 | EAR99 | MALAYSIA | 1.318 / 1k | 获取样片 | 查看供货情况 | |
| M41T83RMY6F | SO18 with embedded crystal | Tape And Reel | -40 | 85 | 批量生产 | 12 | EAR99 | MALAYSIA | 1.965 / 1k | 获取样片 | 查看供货情况 | |
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软件
| 产品型号 | 供货状态 | 封装 | 等级规格 | 符合RoHS级别 | 材料声明** |
|---|---|---|---|---|---|
| M41T83RMY6F | 批量生产 | SO18 with embedded crystal | Industrial | Ecopack1 | |
| M41T83RQA6F | 批量生产 | VFQFPN 16 4x4x1.0 | Industrial | Ecopack2 | |
| M41T83SMY6F | 批量生产 | SO18 with embedded crystal | Industrial | Ecopack1 | |
| M41T83SQA6F | 批量生产 | VFQFPN 16 4x4x1.0 | Industrial | Ecopack2 | |
| M41T83ZMY6F | 批量生产 | SO18 with embedded crystal | Industrial | Ecopack1 | |
| M41T83ZQA6F | 批量生产 | VFQFPN 16 4x4x1.0 | Industrial | Ecopack2 |
(**) st.com上提供的材料声明表单可能是基于包装系列中最常用的封装的通用文档。因此，它们可能不是100%适用于特定的设备。有关特定设备的信息，请联系 销售支持 。
