List of figures M41T01
4/24 DocID025389 Rev 2
List of figures
Figure 1. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2. SOIC connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 3. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 4. Serial bus data transfer sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 5. Acknowledgement sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Figure 6. Slave address location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 7. READ mode sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 8. Alternate READ mode sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 9. WRITE mode sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 10. Crystal accuracy across temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 11. Clock calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 12. AC testing input/output waveform. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Figure 13. Power down/up mode AC waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 14. SO8 – 8-lead plastic small package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
DocID025389 Rev 2 5/24
M41T01 Device overview
24
1 Device overview
Figure 1. Logic diagram
Figure 2. SOIC connections
Table 1. Signal names
OSCI Oscillator input
OCSO Oscillator output
FT/OUT Frequency test / output driver (open drain)
SDA Serial data address input / output
SCL Serial clock
V
BAT
Battery supply voltage
V
CC
Supply voltage
V
SS
Ground
AI07068b
OSCI
V
CC
M41T01
V
SS
SCL
OSCO
SDA
FT/OUT
V
BAT
1
SDAV
SS
SCL
FT/OUTOSCO
OSCI V
CC
V
BAT
AI07069b
M41T01
2
3
4
8
7
6
5
Device overview M41T01
6/24 DocID025389 Rev 2
Figure 3. Block diagram
AI07070b
SECONDS
OSCILLATOR
32.768 kHz
VOLTAGE
SENSE and
SWITCH
CIRCUITRY
SERIAL
BUS
INTERFACE
DIVIDER
CONTROL
LOGIC
ADDRESS
REGISTER
MINUTES
CENTURY/HOURS
DAY
DATE
MONTH
YEAR
CONTROL
OSCI
OSCO
FT/OUT
V
CC
V
SS
V
BAT
SCL
SDA
1 Hz

M41T01M6F

Mfr. #:
Manufacturer:
STMicroelectronics
Description:
Real Time Clock Low-Pwr serial RTC W/ battry switchover
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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