Features: ` 350nA TIMEKEEPING CURRENT @ 3V
` TIMEKEEPING DOWN TO 1.0V
` 1.3V TO 3.6V I2C BUS OPERATING VOLTAGE
` COUNTERS FOR TENTHS/HUNDREDTHS OF SECONDS, SECONDS, MINUTES,
HOURS, DAY, DATE, MONTH, YEAR, AND TURY
` SERIAL INTERFACE SUPPORTS I2C BUS (400kHz)
` PROGRAMMABLE ALARM WITH FLAG BIT ONLY (M41T63/64)
` PROGRAMMABLE ALARM WITH FLAG BIT
AND INTERRUPT FUNCTION (M41T62/65)
` LOW OPERATING CURRENT OF 35A
` SOFTWARE CLOCK CALIBRATION
` OSCILLATOR STOP DETECTION
` 32KHz SQUARE WAVE ON POWER-UP (M41T62/63/64)
` WATCHDOG TIMER
` WATCHDOG OUTPUT (M41T63/65)
` AUTOMATIC LEAP YEAR COMPENSATION
` OPERATING TEMPERATURE OF 40 TO 85°C
` LEAD-FREE 16-PIN QFN PACKAGE
` TOTAL SURFACE AREA OF IC AND 32KHz CRYSTAL IS 21.5mPinout
Specifications
| Symbol |
Parameter |
Conditions(1) |
Value(2) |
Unit |
| TSTG |
Storage Temperature (VCC Off, Oscillator Off) |
|
55 to 125 |
|
| VCC |
Supply Voltage |
|
0.3 to 4.6 |
V |
| TSLD(3) |
Lead Solder Temperature for 10 Seconds |
|
240 |
|
| VIO |
Input or Output Voltages |
|
0.2 to Vcc+0.3 |
V |
| IO |
Output Current |
|
20 |
mA |
| PD |
Power Dissipation |
|
1 |
W |
| VESD(HBM) |
Electro-static discharge voltage (Human Body Model) |
TA = 25°C |
>1000 |
V |
| VESD(RCDM) |
Electro-static discharge voltage (Robotic Charged Device
Model) |
TA = 25°C |
>1000 |
V |
Note: 1. Test conforms to JEDEC standard.
2. Data based on characterization results, not tested in production.
3. Reflow at peak temperature of 260°C (total thermal budget not to exceed 245°C for greater than 30 seconds).DescriptionThe 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., page 14) 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 M41T6x is incremented automatically after each WRITE or READ data byte.
Functions of M41T6x available to the user include a time-ofday 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.
M41T64 Data Sheet
