M41T65 Serial real-time clock (RTC) with alarm
The M41T6x is a low-power serial real-time clock (RTC) with a built-in 32.768 kHz oscillator. Eight registers are used for the clock/calendar function and are configured in binary coded decimal (BCD) format. An additional 8 registers provide status/control of alarm, 32 KHz output, calibration, and watchdog functions. 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.
Functions available to the user include a time-of-day clock/calendar, alarm interrupts (M41T62/65), 32 KHz output (M41T62/63/64), programmable square wave output (M41T62/63/64), and watchdog output (M41T63/65). 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 M41T6x is supplied in two very small packages: a tiny, 3 mm x 3 mm 16-pin QFN which requires a user-supplied 32 KHz crystal, and an ultra-small 1.5 mm x 3.2 mm LCC with embedded crystal - no external crystal is required.
技术特性
- Serial real-time clock (RTC) with alarm functions
- 400 kHz I²C serial interface
- Memory mapped registers for seconds, minutes, hours, day, date, month, year, and century
- Tenths/hundredths of seconds register
- 350 nA timekeeping current at 3 V
- Timekeeping down to 1.0 V
- 1.3 V to 4.4 V I²C bus operating voltage
- 4.4 V max VCCsuitable for lithium-ion battery operation
- Low operating current of 35 μA (at 400 kHz)
- 32 KHz square wave output is on at power-up. Suitable for driving a microcontroller in low-power mode. Can be disabled. (M41T62/63/64)
- Programmable 1 Hz to 32 KHz square wave output (M41T62/63/64)
- Programmable alarm with interrupt function (M41T62/65)
- 32 KHz crystal oscillator integrates crystal load capacitors, works with high series resistance crystals
- Oscillator stop detection monitors clock operation
- Accurate programmable watchdog
- 62.5 ms to 31 min timeout
- Software clock calibration. Can adjust timekeeping to within ±2 parts per million (±5 seconds per month)
- Automatic leap year compensation
- –40 to +85 °C operation
- Two package options:
- Very small 3 mm x 3 mm, lead-free & halogen-free (ECOPACK2®) 16-lead QFN
- Ultra-small 1.5 mm x 3.2 mm, lead-free & halogen-free (ECOPACK2®) 8-pin ceramic leadless chip carrier with embedded 32 KHz crystal - no external oscillator components required (M41T62)
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功能框图
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M41T65 订购信息
| 订购型号 |
产品状态 |
美金价格 |
数量 |
封装 |
包装形式 |
温度范围 |
材料声明 |
| M41T65Q6E |
Active |
|
|
VFQFPN 16 3x3x0.9 |
Tube |
-40 °C-85°C |
M41T65Q6E |
| M41T65Q6F |
Active |
|
|
VFQFPN 16 3x3x0.9 |
Tape And Reel |
-40 °C-85°C |
M41T65Q6F |
DATASHEET
| 描述 |
版本 |
大小 |
| M41T65 : DS3840: Serial real-time clocks (RTCs) with alarm |
19 |
873KB |
APPLICATION NOTES
| 描述 |
版本 |
大小 |
| AN922: Using a Super Cap to back up the M41T56, M41T00, M41T11, M41T65, M41T94, and M41ST84W (16-pin) |
2 |
85KB |
| AN1012: Predicting the battery life and data retention period of NVRAMs and serial RTCs |
4 |
440KB |
| AN1572: Power-down time-stamp function in serial real-time clocks (RTCs) |
2 |
172KB |
| AN1216: Implementing a periodic alarm with TIMEKEEPER® |
1 |
55KB |
| AN934: How to use the digital calibration feature in TIMEKEEPER® and serial real-time clock (RTC) products |
4 |
124KB |
| AN1011: Battery technology used in NVRAM and real-time clock (RTC) products from ST |
4 |
249KB |
| AN3060: Applications guide for serial real-time clocks |
1 |
355KB |
USER MANUALS
| 描述 |
版本 |
大小 |
| UM0276 : STFPC311 LED evaluation board hardware description and user manual |
2 |
503KB |
