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PDF M41T64 Data sheet ( Hoja de datos )
| Número de pieza | M41T64 | |
| Descripción | (M41T62 - M41T65) Serial Access Real-Time Clock | |
| Fabricantes | ST Microelectronics | |
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M41T62, M41T63
M41T64, M41T65
Serial Access Real-Time Clock with Alarms
Feature summary
■ 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 (400kHz)
■ 350nA timekeeping current @ 3V
■ Low operating current of 35µA (@400kHz)
■ Timekeeping down to 1.0V
■ 1.3V to 4.4V I2C bus operating voltage
■ 32KHz square wave on power-up to drive a
microcontroller in low power mode
(M41T62/63/64)
■ Programmable (1Hz to 32KHz) square wave
(M41T63/64)
■ Programmable alarm with interrupt function
(M41T62/65)
■ Accurate programmable watchdog
(from 62.5ms to 31 min)
■ Software clock calibration to compensate
deviation of crystal due to temperature
■ Automatic leap year compensation
QFN16 (Q) 3mm x 3mm
VSOJ20 (47.6mm2)
GND Plane Guard Ring (21.5mm2)
SMT
CRYSTAL
1 XI
2 XO
3
4 ST QFN16
AI11107
32KHz crystal + QFN 16 vs. VSOJ20
■ Operating temperature of –40 to 85°C
■ Lead-free 16-pin QFN package
■ Lithium ion rechargeable operation
Table 1. Device options
Basic RTC Alarms
M41T62
M41T63
M41T64
M41T65
✔
✔
✔
✔
✔
✔
✔
✔
Table 1
OSC fail
detect
✔
✔
✔
✔
Watchdog
timer
Calibration
SQW
output
✔ ✔✔
✔ ✔✔
✔ ✔✔
✔✔
IRQ WDO F32K
output output output
✔
✔
✔
✔✔
August 2006
Rev 11
1/41
www.st.com
1
1 page  
M41T62/63/64/65
1 Summary description
Summary description
The M41T6x Serial Access TIMEKEEPER® is a low power Serial RTC with a built-in 32.768
kHz oscillator (external crystal controlled). Eight registers (see Table 3 on page 19) 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, 32KHz output, Calibration, and
Watchdog 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
(M41T62/65), 32KHz output (M41T64), 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 a 16-pin QFN.
Figure 1. M41T62 logic diagram
VCC
XI
XO
SCL
SDA
M41T62
IRQ/OUT(1)
SQW(2)
1. Open drain.
2. Defaults to 32KHz on power-up.
VSS
AI09103
5/40
5 Page 
M41T62/63/64/65
Summary description
Figure 13. Hardware hookup for SuperCap™ back-up operation
VCC
(1)
M41T6x
VCC
IRQ/FT/OUT(2)
XI WDO(3)
XO SQW(4)
SCL
VSS
SDA
F32K
MCU
VCC
Port
Reset Input
SQWIN
Serial Clock Line
Serial Data Line
32KHz CLKIN
AI10400b
1. Diode required on open drain pin (M41T65 only) for SuperCap (or battery) back-up. Low threshold BAT42
diode recommended.
2. For M41T62 and M41T65 (open drain).
3. For M41T63 and M41T65 (open drain).
4. For M41T64 (open drain).
11/40
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet M41T64.PDF ] | |
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