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M41ST85W Schematic ( PDF Datasheet ) - ST Microelectronics

Teilenummer M41ST85W
Beschreibung 5.0 OR 3.0V / 512 bit 64 x 8 SERIAL RTC and NVRAM SUPERVISOR
Hersteller ST Microelectronics
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Gesamt 30 Seiten
M41ST85W Datasheet, Funktion
M41ST85Y
M41ST85W
5.0 OR 3.0V, 512 bit (64 x 8) SERIAL
RTC and NVRAM SUPERVISOR
FEATURES SUMMARY
s 5.0 OR 3.0V OPERATING VOLTAGE
s SERIAL INTERFACE SUPPORTS I2C BUS
(400 KHz)
s NVRAM SUPERVISOR FOR EXTERNAL
LPSRAM
s OPTIMIZED FOR MINIMAL INTERCONNECT
TO MCU
s 2.5 TO 5.5V OSCILLATOR OPERATING
VOLTAGE
s AUTOMATIC SWITCH-OVER and DESELECT
CIRCUITRY
s CHOICE OF POWER-FAIL DESELECT
VOLTAGES
– M41ST85Y: VCC = 4.5 to 5.5V;
4.20V VPFD 4.50V
– M41ST85W: VCC = 2.7 to 3.6V;
2.55V VPFD 2.70V
s 1.25V REFERENCE (for PFI/PFO)
s COUNTERS FOR TENTHS/HUNDREDTHS
OF SECONDS, SECONDS, MINUTES,
HOURS, DAY, DATE, MONTH, YEAR, and
CENTURY
s 44 BYTES OF GENERAL PURPOSE RAM
s PROGRAMMABLE ALARM and INTERRUPT
FUNCTION (VALID EVEN DURING BATTERY
BACK-UP MODE)
s WATCHDOG TIMER
s MICROPROCESSOR POWER-ON RESET
s BATTERY LOW FLAG
s POWER-DOWN TIMESTAMP (HT BIT)
s ULTRA-LOW BATTERY SUPPLY CURRENT
OF 500nA (MAX)
s PACKAGING INCLUDES A 28-LEAD SOIC and
SNAPHAT® TOP (to be Ordered Separately)
s SOIC SNAPHAT PACKAGE PROVIDES
DIRECT CONNECTION FOR A SNAPHAT
TOP WHICH CONTAINS THE BATTERY and
CRYSTAL
s SOIC EMBEDDED CRYSTAL PACKAGE (MX)
OPTION
Figure 1. 28-pin SOIC Package
SNAPHAT (SH)
Battery & Crystal
28
1
SOH28 (MH)
Figure 2. 28-pin (300mil) SOIC Package
EMBEDDED Crystal
SOX28 (MX)
May 2003
Rev. 4.0
1/33






M41ST85W Datasheet, Funktion
M41ST85Y, M41ST85W
Figure 6. Block Diagram
SDA
SCL
Crystal(2)
WDI
VCC
I2C
INTERFACE
32KHz
OSCILLATOR
REAL TIME CLOCK
CALENDAR
44 BYTES
USER RAM
RTC w/ALARM
& CALIBRATION
AFE
WATCHDOG
WDS
SQUARE WAVE
VBAT
VBL= 2.5V COMPARE
BL
VSO = 2.5V COMPARE
RSTIN1
RSTIN2
VPFD = 4.4V COMPARE
(2.65V for ST85W)
POR
EX
PFI
1.25V
(Internal)
COMPARE
Note: 1. Open drain output
2. Integrated into SOIC package for MX package option.
IRQ/FT/OUT(1)
SQW
VOUT
RST(1)
ECON
PFO
AI03932
6/33

6 Page









M41ST85W pdf, datenblatt
M41ST85Y, M41ST85W
Figure 11. WRITE Cycle Timing: RTC & External SRAM Control Signals
EX
ECON
tEXPD
tEXPD
Figure 12. Bus Timing Requirements Sequence
AI03663
SDA
tBUF
SCL
P
tHD:STA
tR tF
tHIGH
S tLOW
tHD:STA
tSU:DAT
tHD:DAT
tSU:STA
SR
tSU:STO
P
AI00589
Table 6. AC Characteristics
Symbol
Parameter(1)
Min Max Unit
fSCL SCL Clock Frequency
0 400 kHz
tBUF
Time the bus must be free before a new transmission can start
1.3
µs
tEXPD
EX to ECON Propagation Delay
M41ST85Y
M41ST85W
10
ns
15
tF SDA and SCL Fall Time
300 ns
tHD:DAT(2)
Data Hold Time
0 µs
tHD:STA
START Condition Hold Time
(after this period the first clock pulse is generated)
600
ns
tHIGH
Clock High Period
600 ns
tLOW
Clock Low Period
1.3 µs
tR SDA and SCL Rise Time
300 ns
tSU:DAT
Data Setup Time
100 ns
tSU:STA
START Condition Setup Time
(only relevant for a repeated start condition)
600 ns
tSU:STO
STOP Condition Setup Time
600 ns
Note: 1. Valid for Ambient Operating Temperature: TA = –40 to 85°C; VCC = 4.5 to 5.5V or 2.7 to 3.6V (except where noted).
2. Transmitter must internally provide a hold time to bridge the undefined region (300ns max) of the falling edge of SCL.
12/33

12 Page





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