ST M41ST85W Manuals

Manuals and User Guides for ST M41ST85W. We have 1 ST M41ST85W manual available for free PDF download: Manual

ST M41ST85W Manual (43 pages)

3.0/3.3 V I2C combination serial RTC, NVRAM supervisor and microprocessor supervisor

Brand: ST | Category: Computer Hardware | Size: 0 MB

Table of Contents
2
Description
6
Figure 1. Logic Diagram
7
Table 1. Signal Names
8
Figure 2. 28-Pin SOIC Connections
8
Figure 3. 28-Pin, 300 Mil SOIC Connections
9
Figure 4. Block Diagram
10
Figure 5. Hardware Hookup
11
Operating Modes
12
2-Wire Bus Characteristics
12
Bus Not Busy
13
Start Data Transfer
13
Stop Data Transfer
13
Data Valid
13
Acknowledge
13
Figure 6. Serial Bus Data Transfer Sequence
14
Figure 7. Acknowledgement Sequence
14
Figure 8. Write Cycle Timing: RTC & External SRAM Control Signals
14
Read Mode
15
Figure 9. Slave Address Location
15
Figure 10. Read Mode Sequence
16
Figure 11. Alternate Read Mode Sequence
16
Write Mode
17
Data Retention Mode
17
Figure 12. Write Mode Sequence
17
Clock Operation
19
Power-Down Time-Stamp
19
TIMEKEEPER ® Registers
19
Table 2. TIMEKEEPER ® Register Map
20
Calibrating the Clock
21
Figure 13. Crystal Accuracy Across Temperature
22
Figure 14. Calibration Waveform
22
Setting Alarm Clock Registers
23
Table 3. Alarm Repeat Modes
23
Figure 15. Alarm Interrupt Reset Waveform
23
Watchdog Timer
24
Figure 16. Backup Mode Alarm Waveform
24
Square Wave Output
25
Power-On Reset
25
Table 4. Square Wave Output Frequency
25
Reset Inputs (RSTIN1 & RSTIN2)
26
Power-Fail Input/Output
26
Table 5. Reset AC Characteristics
26
Figure 17. RSTIN1 & RSTIN2 Timing Waveforms
26
Century Bit
27
Output Driver Pin
27
Battery Low Warning
27
T Rec Bit
28
Initial Power-On Defaults
28
Table 6. T Rec Definitions
28
Table 7. Default Values
28
Maximum Ratings
29
Table 8. Absolute Maximum Ratings
29
DC and AC Parameters
30
Table 9. DC and AC Measurement Conditions
30
Table 10. Capacitance
30
Figure 18. AC Testing Input/Output Waveforms
30
Table 11. DC Characteristics
31
Table 12. AC Characteristics
32
Figure 19. Bus Timing Requirements Sequence
32
Table 13. Power Down/Up AC Characteristics
33
Figure 20. Power Down/Up Mode AC Waveforms
33
Package Mechanical Data
34
Package Outline
34
Table 15. 4-Pin SNAPHAT ® Housing for 48 Mah Battery & Crystal, Mechanical Data
35
Figure 22. 4-Pin SNAPHAT ® Housing for 48 Mah Battery & Crystal, Package Outline
35
Table 16. 4-Pin SNAPHAT ® Housing for 120 Mah Battery & Crystal, Mechanical Data
36
Figure 23. 4-Pin SNAPHAT ® Housing for 120 Mah Battery & Crystal, Package Outline
36
Table 17. SOX28 - 28-Lead Plastic Small Outline, 300 Mils, Embedded Crystal, Mechanical Data
37
Figure 24. SOX28 - 28-Lead Plastic Small Outline, 300 Mils, Embedded Crystal, Package Outline
37
Table 18. Carrier Tape Dimensions for SOH28 and SOX28 Packages
38
Figure 25. Carrier Tape for SOH28 and SOX28 Package
38
Table 19. Reel Dimensions for 24 MM Carrier Tape (SOH28 and SOX28 Packages)
39
Figure 26. Reel Schematic
39
Table 20. Ordering Information Scheme
40
Table 21. SNAPHAT ® Battery/Crystal Table
40
Figure 27. Recycling Symbols
41
Table 22. Document Revision History
42

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