M41T0_08 STMICROELECTRONICS [STMicroelectronics], M41T0_08 Datasheet
M41T0_08
Related parts for M41T0_08
M41T0_08 Summary of contents
Page 1
Features ■ Counters for seconds, minutes, hours, day, date, month, years, and century ■ 32 KHz crystal oscillator integrating load capacitance (12.5 pF) providing exceptional oscillator stability and high crystal series resistance operation ■ Oscillator stop detection monitors clock operation ...
Page 2
Contents 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
Page 3
List of tables Table 1. Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
Page 4
List of figures Figure 1. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
Page 5
Description The M41T0 real-time clock is a low power serial real-time clock with a built-in 32.768 kHz oscillator (external crystal controlled). Eight registers are used for the clock/calendar function and are configured in binary coded decimal (BCD) format. Addresses ...
Page 6
Figure 3. Block diagram OSCI OSCO OUT SCL SDA 6/22 OSCILLATOR DIVIDER 32.768 kHz CONTROL SERIAL BUS INTERFACE ADDRESS REGISTER 1 Hz SECONDS MINUTES CENTURY/HOURS DAY LOGIC DATE MONTH YEAR CONTROL AI07030 ...
Page 7
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 ...
Page 8
Data valid The state of the data line represents valid data when after a start condition, the data line is stable for the duration of the High period of the clock signal. The data on the line may be ...
Page 9
Figure 5. Acknowledgement sequence START SCLK FROM 1 MASTER DATA OUTPUT MSB BY TRANSMITTER DATA OUTPUT BY RECEIVER Figure 6. Bus timing requirements sequence SDA tBUF tHD:STA tR SCL STOP and S = START 2 ...
Page 10
Table 2. AC characteristics Symbol f SCL clock frequency SCL t Clock low period LOW t Clock high period HIGH t SDA and SCL rise time R t SDA and SCL fall time F START condition hold time t HD:STA ...
Page 11
WRITE mode In this mode the master transmitter transmits to the M41T0 slave receiver. Bus protocol is shown in Figure 10 on page (R placed on the bus and indicates to the addressed device that word ...
Page 12
Figure 9. Alternate READ mode sequence BUS ACTIVITY: MASTER SDA LINE S BUS ACTIVITY: SLAVE ADDRESS Figure 10. WRITE mode sequence BUS ACTIVITY: MASTER SDA LINE S BUS ACTIVITY: SLAVE ADDRESS 12/22 DATA n DATA n+1 WORD DATA n DATA ...
Page 13
Clock operation The M41T0 is driven by a quartz controlled oscillator with a nominal frequency of 32.768 kHz. The accuracy of the real-time clock depends on the frequency of the quartz crystal that is used as the time-base for ...
Page 14
Initial power-on defaults Upon initial application of power to the device, the OUT bit and OF bit will be set to a '1,' while the ST bit will be set to '0.' All other register bits will initially power-on ...
Page 15
Maximum ratings Stressing the device above the rating listed in the “Absolute Maximum Ratings” table may cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions above ...
Page 16
DC and AC parameters This section summarizes the operating and measurement conditions, as well as the DC and AC characteristics of the device. The parameters in the following DC and AC Characteristic tables are derived from tests performed under ...
Page 17
Table 7. DC characteristics Sym Parameter I Input leakage current LI I Output leakage current LO I Supply current CC1 (2) I Supply current (standby) CC2 V Input low voltage IL V Input high voltage IH Output low voltage V ...
Page 18
Package mechanical information In order to meet environmental requirements, ST offers these devices in ECOPACK packages. These packages have a Lead-free second level interconnect . The category of second Level Interconnect is marked on the package and on the ...
Page 19
Figure 12. SO8 – 8-lead plastic small outline, 150 mils body width, package mechanical drawing Drawing is not to scale. Table 9. SO8 – 8-lead plastic small outline, 150 mils body width, ...
Page 20
Part numbering Table 10. Ordering information scheme Example: Device type M41T Supply voltage and write protect voltage 2 Package M = SO8 (150 mils width) Temperature range 6 = –40 to 85°C ...
Page 21
Revision history Table 11. Document revision history Date Revision Feb-2003 18-Feb-2003 01-Apr-2003 10-Apr-2003 30-Oct-2003 30-Jun-2004 23-Jul-2004 22-Aug-2006 04-Apr-2007 13-May-2008 1.0 First issue Add Pb-free information (Table 1.1 information (Features, Figure 1.2 Fix package outline and data (Features, 1.3 Revert ...
Page 22
Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any ...