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參數(shù)資料
| 型號(hào)： | M41T81SMY6F |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Serial Access Real-Time Clock with Alarms |
| 中文描述： | 串行訪問實(shí)時(shí)時(shí)鐘與鬧鐘 |
| 文件頁(yè)數(shù)： | 4/29頁(yè) |
| 文件大小： | 438K |
| 代理商： | M41T81SMY6F |
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M41T81S
4/29
SUMMARY DESCRIPTION
The M41T81S Serial Access TIMEKEEPER
SRAM is a low power Serial RTC with a built-in
32.768kHz oscillator (external crystal controlled).
Eight bytes of the SRAM (see
Table 2., page 12
)
are used for the clock/calendar function and are
configured in binary coded decimal (BCD) format.
An additional 12 bytes of SRAM provide status/
control of Alarm, Watchdog and Square Wave
functions. Addresses and data are transferred se-
rially via a two line, bi-directional I
2
C interface. The
built-in address register is incremented automati-
cally after each WRITE or READ data byte.
The M41T81S has a built-in power sense circuit
which detects power failures and automatically
switches to the battery supply when a power fail-
ure occurs. The energy needed to sustain the
clock operations can be supplied by a small lithium
button supply when a power failure occurs. Func-
tions available to the user include a non-volatile,
time-of-day clock/calendar, Alarm interrupts,
Watchdog Timer and programmable Square
Wave output. The eight clock address locations
contain the century, year, month, date, day, hour,
minute, second and tenths/hundredths of a sec-
ond in 24 hour BCD format. Corrections for 28, 29
(leap year - valid until year 2100), 30 and 31 day
months are made automatically.
The M41T81S is supplied in either an 8-pin SOIC
or an 18-pin (MY), 300mil SOIC package which in-
cludes an embedded 32kHz crystal.
The 18-pin, embedded crystal SOIC requires only
a user-supplied battery to provide non-volatile op-
eration.
Figure 2. Logic Diagram
Note: 1. For SO8 package only.
Table 1. Signal Names
Note: 1. For SO8 package only.
2. NC and NF pins should be tied to V
SS
.
SCL
VCC
M41T81S
VSS
SDA
IRQ/FT/OUT/SQW
VBAT
XI
(1)
XO
(1)
AI09160
XI
(1)
Oscillator Input
XO
(1)
Oscillator Output
IRQ/OUT/
FT/SQW
Interrupt / Output Driver / Frequency
Test / Square Wave (Open Drain)
SDA
Serial Data Input/Output
SCL
Serial Clock Input
V
BAT
Battery Supply Voltage
V
CC
Supply Voltage
V
SS
Ground
NC
(2)
No Connect
NF
(2)
No Function
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