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参数资料
| 型号： | M48T212A-85MH6 |
| 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： | HATLESS, PLASTIC, SOIC-44 |
| 文件页数： | 25/30页 |
| 文件大小： | 155K |
| 代理商： | M48T212A-85MH6 |
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M48T212A
4/30
DESCRIPTION
The M48T212A is a self-contained device that in-
cludes a real time clock (RTC), programmable
alarms, a watchdog timer, and two external chip
enable outputs which provide control of up to four
(two in parallel) external low-power static RAMs.
A built-in 32.768 kHz oscillator (external crystal
controlled) is used for the clock/calendar function.
Access to all TIMEKEEPER functions and the
external RAM is the same as conventional byte-
wide SRAM. The 16 TIMEKEEPER Registers offer
Century, Year, Month, Date, Day, Hour, Minute,
Second, Control, Alarm, Watchdog, and Flags.
Externally attached static RAMs are controlled by
the M48T212A via the E1CON and E2CON signals
(see Table 9, page 11).
Figure 2. Logic Diagram
Table 1. Signal Names
AI03047
4
A0-A3
A
DQ0-DQ7
VCC
M48T212A
G
VSS
8
EX
E2CON
E1CON
W
RSTIN2
RSTIN1
RST
IRQ/FT
VOUT
WDI
E
VCAP/
VBAT+
X0
XI
VCCSW
VBAT–
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
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
VCAP/VBAT+
Super Capacitor Input
VBAT–
Battery Ground Pin (optional)
VCC
Supply Voltage
VSS
Ground
NC
Not Connected internally
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| M48T212V_07 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V TIMEKEEPER supervisor |
| M48T212V-70MH1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER[ CONTROLLER |
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