M4T28-BR12SH ST Microelectronics, M4T28-BR12SH Datasheet - Page 5

• Manufacturer Part Number: M4T28-BR12SH
• Description: TIMEKEEPER SNAPHAT Battery & Crystal
• Manufacturer: ST Microelectronics

Figure 3. Logic Diagram
Note: 1. For 28-pin, 300mil embedded crystal SOIC only.
Figure 4. 28-pin SOIC Connections
RSTIN1
RSTIN2
RSTIN1
RSTIN2
SDA
SCL
WDI
PFI
EX
SQW
PFO
V SS
WDI
NC
NC
NC
NC
NC
NC
NC
NC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
V CC
M41ST85W
M41ST85Y
V SS
M41ST85W
M41ST85Y
V BAT (1)
AI03659
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V CC
EX
IRQ/FT/OUT
V OUT
NC
NC
PFI
NC
SCL
NC
RST
NC
SDA
E CON
E CON
RST
IRQ/FT/OUT
SQW
PFO
V OUT
AI03658
Table 1. Signal Names
Note: 1. For 28-pin, 300mil embedded crystal SOIC only.
Figure 5. 28-pin, 300mil SOIC (MX)
Connections
E
EX
IRQ/FT/OUT
PFI
PFO
RST
RSTIN1
RSTIN2
SCL
SDA
SQW
WDI
V
V
V
V
CON
CC
OUT
SS
BAT
RSTIN1
RSTIN2
(1)
SQW
PFO
V SS
WDI
NC
NC
NC
NC
NC
NC
NC
NC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Conditioned Chip Enable Output
External Chip Enable
Interrupt/Frequency Test/Out Output
(Open Drain)
Power Fail Input
Power Fail Output
Reset Output (Open Drain)
Reset 1 Input
Reset 2 Input
Serial Clock Input
Serial Data Input/Output
Square Wave Output
Watchdog Input
Supply Voltage
Voltage Output
Ground
Battery Supply Voltage
M41ST85W
M41ST85Y
M41ST85Y, M41ST85W
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V SS
V CC
EX
IRQ/FT/OUT
V OUT
PFI
SCL
NC
NC
RST
NC
SDA
E CON
V BAT
AI06370c
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