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부품번호 | M41T66 기능 |
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기능 | Serial real-time clock | ||
제조업체 | STMicroelectronics | ||
로고 | |||
전체 30 페이지수
M41T66
Serial real-time clock with alarms
Features
■ Counters for tenths/hundredths of seconds,
seconds, minutes, hours, day, date, month,
year, and century
■ 32 KHz crystal oscillator integrating load
capacitance and high crystal series resistance
operation
■ Oscillator stop detection monitors clock
operation
■ Serial interface supports I2C bus (400 kHz)
■ 525 nA timekeeping current at 3 V
■ Low operating current of 35 µA (at 400 kHz)
■ Timekeeping down to 1.0 V
■ 1.3 V to 4.4 V I2C bus operating voltage
– Allows use in lithium ion rechargeable
applications
■ 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 with interrupt function
■ Accurate programmable watchdog
(from 62.5 ms to 31 min)
■ Software clock calibration to compensate
deviation of crystal due to temperature
■ Automatic leap year compensation
■ Operating temperature of –40 to 85 °C
■ Lead-free 16-pin QFN package
www.DataSheet.net/
QFN16 3 mm x 3 mm
October 2011
Doc ID 15108 Rev 2
1/41
www.st.com
1
Datasheet pdf - http://www.DataSheet4U.co.kr/
List of figures
List of figures
M41T66
Figure 1.
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Figure 5.
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Figure 17.
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Figure 19.
Figure 20.
Figure 21.
M41T66 logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
M41T66 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
M41T66 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Hardware hookup for SuperCap™ backup operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Serial bus data transfer sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Acknowledgement sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Slave address location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
READ mode sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Alternative READ mode sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
WRITE mode sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Crystal accuracy across temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Calibration waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Alarm interrupt reset waveform. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
AC measurement I/O waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Crystal isolation example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Bus timing requirements sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
QFN16 – 16-lead, quad, flat package, no lead, 3 x 3 mm body size, outline . . . . . . . . . . . 28
QFN16 – 16-lead, quad, flat package, no lead, 3 x 3 mm, recommended footprint . . . . . . 29
32 KHz crystal + QFN16 vs. VSOJ20 mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Carrier tape for QFN16 (3 mm x 3 mm) package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Reel schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
www.DataSheet.net/
4/34 Doc ID 15108 Rev 2
Datasheet pdf - http://www.DataSheet4U.co.kr/
4페이지 M41T66
Description
Figure 4. Hardware hookup for SuperCap™ backup operation
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1. Open drain
2. For a crystal with a load capacitance (CL) of 12.5 pF, two parallel external 12.5 pF capacitors (C1 and C2)
must be added to achieve better clock accuracy.
3. It can also be connected to another power supply.
4. Due to the output buffer circuitry used for the SQW output, this pin must not be taken to a voltage greater
than VCC. Diode required on SQW pin for SuperCap™ (or battery) backup. Low threshold BAT42 diode
recommended.
www.DataSheet.net/
Doc ID 15108 Rev 2
7/34
Datasheet pdf - http://www.DataSheet4U.co.kr/
7페이지 | |||
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부품번호 | 상세설명 및 기능 | 제조사 |
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DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |