M41T80

Serial real-time clock (RTC) with alarm

The M41T80 is a low power serial RTC with a built-in 32.768 kHz oscillator (external crystal controlled). Eight registers are used for the clock/calendar function and are configured in binary coded decimal (BCD) format. An additional 12 registers provide status/control of alarm, 32 KHz output, and square wave functions. Addresses and data are transferred serially via a two line, bi-directional 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, 32 KHz output, and programmable square wave output. 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 - valid until year 2100), 30 and 31 day months are made automatically.

The M41T80 is supplied in an 8-pin SOIC.

主な特徴

Counters for tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century
32 KHz crystal oscillator integrating load capacitance (12.5 pF) providing exceptional oscillator stability and high crystal series resistance operation
Serial interface supports I²C bus (400 kHz)
2.0 to 5.5 V clock operating voltage
32 KHz square wave on power-up to drive a microcontroller in low-power mode
Programmable (1 Hz to 32 KHz) square wave
Programmable alarm and interrupt function
Low operating current of 200 μA
Operating temperature of –40 to 85 °C
ECOPACK^®package available

回路ダイアグラム

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リソース

技術文書

製品スペック

	Description	バージョン	サイズ
	DS2929: Serial access real-time clock with alarm	5.1	435.04 KB

アプリケーションノート

Description	バージョン	サイズ
AN3060: シリアルリアルタイムクロック（RTC）アプリケーションガイド	1.0	823.25 KB
AN1011: STマイクロエレクトロニクスのNVRAMおよびリアルタイムクロック(RTC）製品で使用されているバッテリー技術	4.0	476.81 KB
AN934: How to use the digital calibration feature in TIMEKEEPER® and serial real-time clock (RTC) products	4.1	123.42 KB
AN1216: Implementing a periodic alarm with TIMEKEEPER® and serial real-time clocks (RTCs)	2.0	192.89 KB
AN4641: TIMEKEEPER®とリアルタイムクロック監視機能の統合	1.0	604.71 KB
AN923: Managing century information using serial real-time clocks and TIMEKEEPER® NVRAMs	4.0	142.23 KB
AN1572: シリアルリアルタイムクロック（RTC）の電源遮断タイムスタンプ機能	2.0	455.97 KB
AN1336: Power-fail comparator for NVRAM supervisory devices	2.0	127.81 KB

Publications and Collaterals

パンフレット

	Description	バージョン	サイズ
	Serial real-time clock ICs	1.0	827.11 KB

ツール & ソフトウェア

ソフトウェア製品

Clocks and Timers Software

製品型番	製造元	Description
STSW-SRTC001	ST	I2C code for Serial RTC
STSW-SRTC002	ST	SPI code -Serial RTC

ビデオ

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サンプル & 購入

製品型番	パッケージ	Packing Type	Operating Temperature (°C) (min)	Operating Temperature (°C) (max)	Marketing Status	Unit Price (US$) *	数量	NVRAM size (B)	ECCN (US)	Country of Origin	More info	Order from ST	Order from Distributors
M41T80M6F	SO-8	Tape And Reel	-40	85	Active : Product is in volume production	0.941	1000	-	EAR99	MOROCCO	MORE INFO	Free Sample 買い物かごに追加	DISTRIBUTOR AVAILABILITY

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors

品質 & 信頼性

製品型番	Marketing Status	パッケージ	Grade	RoHS Compliance Grade	Material Declaration**
M41T80M6F	アクティブ	SO-8	インダストリアル	Ecopack1

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.