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PDF ( 数据手册 , 数据表 ) M41ST84WMQ

零件编号 M41ST84WMQ
描述 5.0 or 3.0V / 512 bit 64 x 8 SERIAL RTC with SUPERVISORY FUNCTIONS
制造商 ST Microelectronics
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M41ST84WMQ 数据手册, 描述, 功能
M41ST84Y
M41ST84W
5.0 or 3.0V, 512 bit (64 x 8) SERIAL RTC
with SUPERVISORY FUNCTIONS
FEATURES SUMMARY
s 5.0 OR 3.0V OPERATING VOLTAGE
s SERIAL INTERFACE SUPPORTS I2C BUS
(400 KHz)
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:
– M41ST84Y: VCC = 4.5 to 5.5V;
4.20V VPFD 4.50V
– M41ST84W: 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 ULTRA-LOW BATTERY SUPPLY CURRENT
OF 500 nA (max)
s OPTIONAL PACKAGING INCLUDES A 28-
LEAD SOIC and SNAPHAT® TOP (to be
ordered separately)
s SNAPHAT PACKAGE PROVIDES DIRECT
CONNECTION FOR A SNAPHAT TOP,
WHICH CONTAINS THE BATTERY and
CRYSTAL
* Contact Local Sales Office
Figure 1. 16-pin SOIC Package
16
1
SO16 (MQ)
Figure 2. 28-pin SOIC Package*
SNAPHAT (SH)
Battery & Crystal
28
1
SOH28 (MH)
June 2003
Rev. 4.0
1/31







M41ST84WMQ pdf, 数据表
M41ST84Y, M41ST84W
Table 5. DC Characteristics
Sym
Parameter
Test
Condition(1)
M41ST84Y
Min Typ Max
M41ST84W
Min Typ Max
Unit
Battery Current OSC
ON
IBAT
Battery Current OSC
OFF
TA = 25°C,
VCC = 0V,
VBAT = 3V
400 500
50
400 500 nA
50 nA
ICC1 Supply Current
f = 400kHz
1.4
0.75 mA
ICC2
Supply Current
(Standby)
SCL, SDA =
VCC – 0.3V
1
0.50 mA
Input Leakage Current 0V VIN VCC
±1
±1 µA
ILI(2) Input Leakage Current
(PFI)
–25 2 25 –25 2 25 nA
ILO(3)
Output Leakage
Current
0V VOUT VCC
±1
±1 µA
VIH Input High Voltage
0.7VCC
VCC + 0.3 0.7VCC
VCC + 0.3 V
VIL Input Low Voltage
–0.3
0.3VCC –0.3
0.3VCC V
VBAT Battery Voltage
2.5 3.0 3.5(6)
2.5 3.0 3.5(6) V
VOH Output High Voltage(4)
IOH = –1.0mA
2.4
2.4 V
Output Low Voltage
VOL Output Low Voltage
(Open Drain)(5)
IOL = 3.0mA
IOL = 10mA
0.4
0.4
0.4 V
0.4 V
VPFD Power Fail Deselect
4.20 4.40 4.50
2.55 2.60 2.70
V
PFI Input Threshold
VPFI
PFI Hysteresis
VCC = 5V(Y)
VCC = 3V(V)
PFI Rising
1.225 1.250 1.275
20 70
1.225 1.250 1.275
20 70
V
mV
VSO
Battery Back-up
Switchover
2.5 2.5 V
Note: 1. Valid for Ambient Operating Temperature: TA = –40 to 85°C; VCC = 2.7 to 3.6V or 4.5 to 5.5V (except where noted).
2. RSTIN internally pulled-up to VCC through 100Kresistor. WDI internally pulled-down to VSS through 100Kresistor.
3. Outputs deselected.
4. For PFO and SQW pins (CMOS).
5. For IRQ/FT/OUT, RST pins (Open Drain): if pulled-up to supply other than VCC, this supply must be equal to, or less than 3.0V when
VCC = 0V (during battery back-up mode).
6. For rechargeable back-up, VBAT (max) may be considered VCC.
Table 6. Crystal Electrical Characteristics (Externally Supplied)
Symbol
Parameter(1,2)
Typ Min Max Unit
f0 Resonant Frequency
32.768
kHz
RS Series Resistance
50 k
CL Load Capacitance
12.5 pF
Note: 1. Load capacitors are integrated within the M41ST84Y/W. Circuit board layout considerations for the 32.768 kHz crystal of minimum
trace lengths and isolation from RF generating signals should be taken into account.
2. STMicroelectronics recommends the KDS DT-38: 1TA/1TC252E127, Tuning Fork Type (thru-hole) or the DMX-26S:
1TJS125FH2A212, (SMD) quartz crystal for industrial temperature operations. KDS can be contacted at [email protected] or ht-
tp://www.kdsj.co.jp for further information on this crystal type.
8/31







M41ST84WMQ equivalent, schematic
M41ST84Y, M41ST84W
Table 9. TIMEKEEPER® Register Map
Data
Address
D7 D6 D5 D4 D3 D2 D1 D0
Function/Range
BCD Format
00h 0.1 Seconds
0.01 Seconds
Seconds
00-99
01h ST
10 Seconds
Seconds
Seconds
00-59
02h 0
10 Minutes
Minutes
Minutes
00-59
03h CEB CB
10 Hours
Hours (24 Hour Format)
Century/Hours 0-1/00-23
04h TR 0 0 0 0
Day of Week
Day 01-7
05h 0 0
10 Date
Date: Day of Month
Date
01-31
06h 0 0 0 10M
Month
Month
01-12
07h 10 Years
Year
Year
00-99
08h OUT FT
S
Calibration
Control
09h WDS BMB4 BMB3 BMB2 BMB1 BMB0 RB1 RB0 Watchdog
0Ah AFE SQWE ABE Al 10M
Alarm Month
Al Month
01-12
0Bh RPT4 RPT5 AI 10 Date
Alarm Date
Al Date
01-31
0Ch RPT3 HT
AI 10 Hour
Alarm Hour
Al Hour
00-23
0Dh RPT2
Alarm 10 Minutes
Alarm Minutes
Al Min
00-59
0Eh RPT1
Alarm 10 Seconds
Alarm Seconds
Al Sec
00-59
0Fh WDF AF 0 BL 0 0 0 0
Flags
10h 0 0 0 0 0 0 0 0 Reserved
11h 0 0 0 0 0 0 0 0 Reserved
12h 0 0 0 0 0 0 0 0 Reserved
13h RS3 RS2 RS1 RS0 0 0 0 0
SQW
Keys: S = Sign Bit
FT = Frequency Test Bit
ST = Stop Bit
0 = Must be set to zero
BL = Battery Low Flag (Read only)
BMB0-BMB4 = Watchdog Multiplier Bits
CEB = Century Enable Bit
CB = Century Bit
OUT = Output level
AFE = Alarm Flag Enable Flag
RB0-RB1 = Watchdog Resolution Bits
WDS = Watchdog Steering Bit
ABE = Alarm in Battery Back-Up Mode Enable Bit
RPT1-RPT5 = Alarm Repeat Mode Bits
WDF = Watchdog flag (Read only)
AF = Alarm flag (Read only)
SQWE = Square Wave Enable
RS0-RS3 = SQW Frequency
HT = Halt Update Bit
TR = tREC Bit
16/31










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