參數(shù)資料
型號: M48T512V-70PM1
廠商: STMICROELECTRONICS
元件分類: 時鐘/數(shù)據(jù)恢復(fù)及定時提取
英文描述: REAL TIME CLOCK, PDIP32
封裝: ROHS COMPLIANT, PLASTIC, DIP-32
文件頁數(shù): 5/23頁
文件大?。?/td> 370K
代理商: M48T512V-70PM1
M48T512Y, M48T512V
Clock operations
Doc ID 5747 Rev 6
One method for ascertaining how much calibration a given M48T512Y/V may require
involves setting the clock, letting it run for a month and comparing it to a known accurate
reference and recording deviation over a fixed period of time.
Calibration values, including the number of seconds lost or gained in a given period, can be
found in STMicroelectronics’ application note AN934, “TIMEKEEPER calibration.” This
allows the designer to give the end user the ability to calibrate the clock as the environment
requires, even if the final product is packaged in a non-user serviceable enclosure. The
designer could provide a simple utility that accesses the calibration bits. For more
information on calibration see application note AN934, “TIMEKEEPER calibration” on the
ST website.
Figure 7.
Crystal accuracy across temperature
Figure 8.
Calibration waveform
AI00999
–160
0
10203040506070
Frequency (ppm)
Temperature
°C
80
–10
–20
–30
–40
–100
–120
–140
–40
–60
–80
20
0
–20
ΔF
= -0.038
(T - T
0)
2 ± 10%
F
ppm
C
2
T
0 = 25 °C
AI00594B
NORMAL
POSITIVE
CALIBRATION
NEGATIVE
CALIBRATION
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M48T512V-85PM1 功能描述:實時時鐘 4 MBIT 512 Kbitx8 TIMEKEEPER RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
M48T512VPM 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM
M48T512Y 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM
M48T512Y_10 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.3 V, 4 Mbit (512 Kbit x 8) TIMEKEEPER? SRAM
M48T512Y-70PM1 功能描述:實時時鐘 4M (512Kx8) 70ns RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube