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参数资料
| 型号： | M48T513Y-70PM1 |
| 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, PDIP36 |
| 封装： | 0.600 INCH, PLASTIC, MODULE, DIP-36 |
| 文件页数： | 5/18页 |
| 文件大小： | 134K |
| 代理商： | M48T513Y-70PM1 |
13/18
M48T513Y, M48T513V
Figure 11. Alarm Interrupt Reset Waveform
Figure 12. Back-up Mode Alarm Waveforms
AI02581
AD0-AD7
ACTIVE FLAG BIT
ADDRESS 1FF0h
IRQ/FT
HIGH-Z
15ns Min
AI01678C
VCC
IRQ/FT
HIGH-Z
VPFD (max)
VPFD (min)
AFE bit in Interrupt Register
AF bit in Flags Register
HIGH-Z
VSO
tREC
If a binary ’1’ is loaded into the register, only the
first 2 minutes in the 64 minute cycle will be modi-
fied; if a binary 6 is loaded, the first 12 will be af-
fected, and so on. Therefore, each calibration step
has the effect of adding 512 or subtracting 256 os-
cillator cycles for every 125, 829, 120 actual oscil-
lator cycles, that is +4.068 or –2.034 ppm of
adjustment per calibration step in the calibration
register. Assuming that the oscillator is running at
exactly 32,768Hz, each of the 31 increments in the
Calibration byte would represent +10.7 or –5.35
seconds per month which corresponds to a total
range of +5.5 or –2.75 minutes per month. Figure
10 illustrates a TIMEKEEPER calibration wave-
form.
Two methods are available for ascertaining how
much calibration a given M48T513Y/V may re-
quire. The first involves setting the clock, letting it
run for a month and comparing it to a known accu-
rate reference and recording deviation over a fixed
period of time.
Calibration values, including the number of sec-
onds lost or gained in a given period, can be found
in Application Note: TIMEKEEPER CALIBRA-
TION.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M48T513Y-85CS1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM |
| M48T513Y-85PM1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM |
| M48T513YPM | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM |
| M48T513YSH | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM |
| M48T559 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:64 Kbit 8Kb x8 TIMEKEEPER SRAM with ADDRESS/DATA MULTIPLEXED |
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