M41T0M6 STMicroelectronics, M41T0M6 Datasheet - Page 7

• Manufacturer Part Number: M41T0M6
• Description: Real Time Clock ENV 511-M41T0M6E
• Manufacturer: STMicroelectronics

Specifications of M41T0M6

• Function: Clock, Calendar
• Rtc Memory Size: 8 B
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Rtc Bus Interface: Serial
• Package / Case: SO-8
• Time Format: HH:MM:SS
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2
2.1
2.1.1
2.1.2
2.1.3
Operation
The M41T0 clock operates as a slave device on the serial bus. Access is obtained by
implementing a start condition followed by the correct slave address (D0h). The 8 bytes
contained in the device can then be accessed sequentially in the following order:
1.
2.
3.
4.
5.
6.
7.
8.
2-wire bus characteristics
This bus is intended for communication between different ICs. It consists of two lines: one
bidirectional for data signals (SDA) and one for clock signals (SCL). Both the SDA and the
SCL lines must be connected to a positive supply voltage via a pull-up resistor.
The following protocol has been defined:
●
●
Accordingly, the following bus conditions have been defined:
Bus not busy
Both data and clock lines remain high.
Start data transfer
A change in the state of the data line, from high to low, while the clock is high, defines the
START condition.
Stop data transfer
A change in the state of the data line, from low to high, while the clock is high, defines the
STOP condition.
Seconds register
Minutes register
Century/hours register
Day register
Date register
Month register
Years register
Control register
Data transfer may be initiated only when the bus is not busy.
During data transfer, the data line must remain stable whenever the clock line is High.
Changes in the data line while the clock line is High will be interpreted as control
signals.
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