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參數(shù)資料
| 型號(hào)： | M41T11SH |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 512 bit 64b x8 Serial Access TIMEKEEPER SRAM |
| 中文描述： | 512位64B條x8串行SRAM的訪問(wèn)計(jì)時(shí)器 |
| 文件頁(yè)數(shù)： | 12/19頁(yè) |
| 文件大?。?/td> | 137K |
| 代理商： | M41T11SH |
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M41T11
12/19
For example, a reading of 512.01024Hz would in-
dicate a +20ppm oscillator frequency error, requir-
ing a –10(XX001010) to be loaded into the
Calibration Byte for correction. Note that setting or
changing the Calibration Byte does not affect the
Frequency test output frequency.
OUTPUT DRIVER PIN
When the FT bit is not set, the FT/OUT pin be-
comes an output driver that reflects the contents of
D7 of the control register. In other words, when D6
of location 7 is a zero and D7 of location 7 is a zero
and then the FT/OUT pin will be driven low.
Note:
The FT/OUT pin is open drain which re-
quires an external pull-up resistor.
POWER-ON DEFAULTS
Upon initial application of power to the device, the
FT bit will be set to a '0' and the OUT bit will be set
to a '1'. All other Register bits will initially power-on
in a random state.
Two methods are available for ascertaining how
much calibration a given M41T11 may require.
The first involves simply setting the clock, letting it
run for a month and comparing it to a known accu-
rate reference (like WWV broadcasts). While that
may seem crude, it allows the designer to give the
end user the ability to calibrate his clock as his en-
vironment may require, even after the final product
is packaged in a non-user serviceable enclosure.
All the designer has to do is provide a simple utility
that accessed the Calibration byte.
The second approach is better suited to a manu-
facturing environment, and involves the use of
some test equipment. When the Frequency Test
(FT) bit, the seventh-most significant bit in the
Control Register, is set to a '1', and the oscillator is
running at 32,768Hz, the FT/OUT pin of the device
will toggle at 512Hz. Any deviation from 512Hz in-
dicates the degree and direction of oscillator fre-
quency shift at the test temperature.
Figure 13. Clock Calibration
AI00594B
NORMAL
POSITIVE
CALIBRATION
NEGATIVE
CALIBRATION
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| M41T11MH | 512 bit 64b x8 Serial Access TIMEKEEPER SRAM |
| M41T11M | 512 bit 64b x8 Serial Access TIMEKEEPER SRAM |
| M41T256YSH | Hook-Up Wire; Conductor Size AWG:24; No. Strands x Strand Size:Solid; Jacket Color:Brown; Approval Bodies:UL, CSA; Approval Categories:UL AWM Style 1061; CSA AWM; Conductor Material:Copper; Jacket Material:Polyvinylchloride (PVC) RoHS Compliant: Yes |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M41T256Y | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:256 Kbit 32K x8 SERIAL RTC |
| M41T256Y_07 | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:256Kbit (32K x 8) serial RTC |
| M41T256YMH | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:256 Kbit 32K x8 SERIAL RTC |
| M41T256YMH7 | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:256 Kbit 32K x8 SERIAL RTC |
| M41T256YMH7E | 功能描述:實(shí)時(shí)時(shí)鐘 Serial 256K (32Kx8) 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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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 |
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