M41T81 查看數據表（PDF） - STMicroelectronics
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M41T81 Datasheet PDF : 28 Pages
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Figure 5. 8-pin SOIC (M) Connections
XI
XO
VBAT
VSS
1
8
2
7
3 M41T81 6
4
5
VCC
IRQ/FT/OUT/SQW
SCL
SDA
AI04769
Figure 6. 18-pin, 300mil SOIC (MY)
Connections
NC
NC
NC
NC
NC
NC
NC
VBAT
VSS
1
18
2
17
3
16
4
15
5
14
6
13
7 M41T81 12
8
11
9
10
NC
NC
NC
VCC
NC
IRQ/FT/OUT/SQW
NC
SCL
SDA
AI07830
Figure 8. Block Diagram
CRYSTAL
32KHz
OSCILLATOR
SDA
SCL
VCC
I2C
INTERFACE
WRITE
PROTECT
VBAT
VSO(2) COMPARE
Note 1. Open drain output
Note 2. VSO = VBAT – 0.5V (typ)
M41T81
Figure 7. 28-pin, 300mil SOIC (MX)
Connections
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
VBAT
VSS
1
28
2
27
3
26
4
25
5
24
6
23
7 M41T81 22
8
21
9
20
10
19
11
18
12
17
13
16
14
15
VCC
NC
IRQ/FT/OUT/SQW
NC
VSS
NC
SCL
NC
VCC(1)
NC
IRQ/FT/OUT/SQW(1)
SDA
SCL(1)
SDA(1)
AI07805
Note: 1. No Connect (NC) pin for 28-pin SOIC, but should be con-
sidered to have indicated function in anticipation of re-
placement with 18-pin SOIC.
REAL TIME CLOCK
CALENDAR
RTC W/ALARM
& CALIBRATION AFE
WDF
WATCHDOG
SQUARE WAVE SQWE
INTERNAL
POWER
IRQ/FT/OUT/SQW(1)
AI04616
5/28
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