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参数资料
| 型号： | M48T212V-70MH1TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, PDSO44 |
| 封装： | SNAPHAT, PLASTIC, SO-44 |
| 文件页数： | 12/23页 |
| 文件大小： | 150K |
| 代理商： | M48T212V-70MH1TR |
M48T212Y, M48T212V
2/23
Insertion of the SNAPHAT housing after reflow
prevents potential battery and crystal damage due
to the high temperatures required for device sur-
face-mounting. The SNAPHAT housing is keyed
to prevent reverse insertion.
The SOIC and battery/crystal packages are
shipped separately in plastic anti-static tubes or in
Tape & Reel form. For the 44 lead SOIC, the bat-
tery/crystal package (i.e. SNAPHAT) part number
is ”M4TXX-BR12SH” (see Table 15).
Caution: Do not place the SNAPHAT battery/crys-
tal top in conductive foam, as this will drain the lith-
ium button-cell battery.
Automatic backup and write protection for an ex-
ternal SRAM is provided through VOUT,E1CON
and E2CON pins. (Users are urged to insure that
voltage specifications, for both the controller chip
and external SRAM chosen, are similar). The
SNAPHAT containing the lithium energy source
used to permanently power the real time clock is
also used to retain RAM data in the absence of
VCC power through the VOUT pin.
The chip enable outputs to RAM (E1CON and
E2CON) are controlled during power transients to
prevent data corruption. The date is automatically
adjusted for months with less than 31 days and
corrects for leap years. The internal watchdog tim-
er provides programmable alarm windows.
The nine clock bytes (Fh - 9h and 1h) are not the
actual clock counters, they are memory locations
consisting of BiPORTTM read/write memory cells
within the static RAM array. Clock circuitry up-
dates the clock bytes with current information once
per second. The information can be accessed by
the user in the same manner as any other location
in the static memory array.
Byte 8h is the clock control register. This byte con-
trols user access to the clock information and also
stores the clock calibration setting. Byte 7h con-
tains the watchdog timer setting. The watchdog
timer can generate either a reset or an interrupt,
depending on the state of the Watchdog Steering
bit (WDS). Bytes 6h-2h include bits that, when pro-
grammed, provide for clock alarm functionality.
Alarms are activated when the register content
matches the month, date, hours, minutes, and
seconds of the clock registers. Byte 1h contains
century information. Byte 0h contains additional
flag information pertaining to the watchdog timer,
alarm and battery status.
Table 1. Signal Names
A0-A3
Address Inputs
DQ0-DQ7
Data Inputs/Outputs
RSTIN1
Reset 1 Input
RSTIN2
Reset 2 Input
RST
Reset Output (Open Drain)
WDI
Watchdog Input
A
Bank Select Input
E
Chip Enable Input
EX
External Chip Enable Input
G
Output Enable Input
W
Write Enable Input
E1CON
RAM Chip Enable 1 Output
E2CON
RAM Chip Enable 2 Output
IRQ/F T
Int/Freq Test Output (Open Drain)
Vccsw
VCC Switch Output
VOUT
Supply Voltage Output
VCC
Supply Voltage
VSS
Ground
NC
Not Connected internally
Figure 2. SOIC Connections
AI03020
22
44
43
VSS
1
A0
NC
A1
NC
A
NC
E1CON
NC
VOUT
NC
G
E
VCC
M48T212Y
M48T212V
10
2
5
6
7
8
9
11
12
13
14
15
21
40
39
36
35
34
33
32
31
30
29
28
NC
EX
VCCSW
3
4
38
37
42
41
WDI
E2CON
DQ7
DQ5
DQ0
DQ1
DQ3
DQ4
DQ6
16
17
18
19
20
27
26
25
24
23
A2
A3
NC
RSTIN2
NC
RST
NC
W
NC
RSTIN1
DQ2
IRQ/FT
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| M48T212Y-70MH1TR | 0 TIMER(S), REAL TIME CLOCK, PDSO44 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M48T212V-70MH6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER[ CONTROLLER |
| M48T212V-70MH6E | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER CONTROLLER Supervisor |
| M48T212V-70MH6F | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER CONTROLLER Supervisor |
| M48T212V-70MH6TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER[ CONTROLLER |
| M48T212V-85MH1 | 功能描述:监控电路 SRAM TK 16X8 85ns RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
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