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参数资料
| 型号： | M48T212A-85MH1 |
| 厂商： | 意法半导体 |
| 英文描述： | 3.3V TIMEKEEPER CONTROLLER |
| 中文描述： | 3.3计时控制器 |
| 文件页数： | 2/20页 |
| 文件大小： | 165K |
| 代理商： | M48T212A-85MH1 |
M48T212A
2/20
The lithium energy source (or super capacitor)
used to permanently power the real time clock is
also used to retain RAM data in the absence of
V
CC
power through the V
OUT
pin.
The chip enable outputs to RAM (E1
CON
and
E2
CON
) 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 BiPORT
TM
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.
The M48T212A also has its own Power-Fail De-
tect circuit. This control circuitry constantly moni-
tors the supply voltage for an out of tolerance
condition. When V
CC
is out of tolerance, the circuit
write protects the TIMEKEEPER register data and
external SRAM, providing data security in the
midst of unpredictable system operation. As V
CC
falls, the control circuitry automatically switches to
the battery, maintaining data and clock operation
until valid power is restored.
Table 1. Signal Names
A0-A3
Address Inputs
DQ0-DQ7
Data Inputs/Outputs
XO
Oscillator Output
XI
Oscillator Input
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
E1
CON
RAM Chip Enable 1 Output
E2
CON
RAM Chip Enable 2 Output
IRQ/FT
Int/Freq Test Output (Open Drain)
Vccsw
V
CC
Switch Output
V
OUT
Supply Voltage Output
V
CAP
Super Capacitor Input
V
BAT–
Battery Ground Pin (optional)
V
CC
Supply Voltage
V
SS
Ground
NC
Not Connected internally
Figure 2. SOIC Connections
AI03048
22
44
43
42
41
VSS
1
2
3
4
A0
NC
NC
NC
NC
NC
A1
A
NC
NC
NC
NC
G
W
E1CON
DQ7
DQ6
VOUT
VCCSW
IRQ/FT
E
VCC
M48T212A
10
11
12
13
14
15
16
17
18
19
20
5
6
7
8
9
21
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
XI
XO
EX
NC
WDI
E2CON
DQ0
DQ1
DQ2
DQ5
DQ4
DQ3
VCAP
A2
A3
RSTIN2
RST
NC
NC
VBAT–
RSTIN1
相关PDF资料 |
PDF描述 |
|---|---|
| M48T212Y-70MH1TR | Shielded Multiconductor Cable; Number of Conductors:4; Conductor Size AWG:24; No. Strands x Strand Size:7 x 32; Jacket Material:Polyvinylchloride (PVC); Leaded Process Compatible:Yes; Conductor Material:Copper; Temperature Max:80 C RoHS Compliant: Yes |
| M48T212Y-70MH6 | Shielded Multiconductor Cable; Number of Conductors:5; Conductor Size AWG:24; No. Strands x Strand Size:7 x 32; Jacket Material:Polyvinylchloride (PVC); Leaded Process Compatible:Yes; Conductor Material:Copper; Temperature Max:80 C RoHS Compliant: Yes |
| M48T212Y-70MH6TR | Shielded Multiconductor Cable; Number of Conductors:5; Conductor Size AWG:24; No. Strands x Strand Size:7 x 32; Jacket Material:Polyvinylchloride (PVC); Leaded Process Compatible:Yes; Conductor Material:Copper; Temperature Max:80 C RoHS Compliant: Yes |
| M48T212YSH | Hook-Up Wire; Conductor Size AWG:24; No. Strands x Strand Size:Solid; Jacket Color:Red; Approval Bodies:UL, CSA; Approval Categories:UL AWM Style 1061; CSA AWM; Conductor Material:Copper; Conductor Plating:Tin RoHS Compliant: Yes |
| M48T212Y-85MH6TR | 5V/3.3V TIMEKEEPER[ CONTROLLER |
相关代理商/技术参数 |
参数描述 |
|---|---|
| M48T212A-85MH1TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V TIMEKEEPER CONTROLLER |
| M48T212A-85MH6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V TIMEKEEPER CONTROLLER |
| M48T212A-85MH6TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V TIMEKEEPER CONTROLLER |
| M48T212AMH | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V TIMEKEEPER CONTROLLER |
| M48T212V | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V TIMEKEEPER supervisor |
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