參數(shù)資料
型號(hào)： FM30C256-S
廠商： Electronic Theatre Controls, Inc.
英文描述： 256Kb Data Collector
中文描述： 256Kb的數(shù)據(jù)采集器
文件頁(yè)數(shù)： 6/18頁(yè)
文件大?。?/td> 260K
代理商： FM30C256-S
FM30C256
Rev 2.1
Dec. 2002
Page 6 of 18
32.768 kHz
crystal
Oscillator
Clock
Divider
Update
Logic
512 Hz
W
R
Seconds
7 bits
Minutes
7 bits
Hours
6 bits
Date
6 bits
Months
5 bits
Years
8 bits
CF
Days
3 bits
User Interface Registers
1 Hz
Figure 2. Real-time Clock Core Block Diagram
Calibration
When the CAL bit in register 0 is set to 1, the clock
enters calibration mode. Calibration operates by
applying a digital correction to the counter based on
the frequency error. In CAL mode, the CAL pin is
driven with a 512 Hz (nominal) square wave. Any
measured deviation from 512 Hz is converted to an
error in ppm. This error corresponds to a correction
value that is then written by the user into the
calibration register. The correction factors are listed
in the table below.
Positive ppm errors require a negative adjustment
that removes pulses. Negative ppm errors require a
positive correction that adds pulses. Positive ppm
adjustments have the CALS bit set to 1, where as
negative ppm adjustments have CALS = 0. After
calibration, the clock will have a maximum error of
±
2.17 ppm or
±
0.09 minutes per month at the
calibrated temperature.
The calibration setting is battery backed and is stored
in bits CAL.4-0. This value only can be written when
the CAL bit is set to a 1. To exit the calibration
mode, the user must clear the CAL bit to a 0. When
the CAL bit is 0, the CAL pin will be driven low.
When the calibration mode is entered, the user can
measure the frequency error on the CAL pin. This
error expressed in ppm translates directly into
timekeeping
error.
An
adjustment corrects this error. However, the
correction is applied by adding or removing pulses on
a periodic basis. Therefore, the correction will not
appear on the 512 Hz output. The calibration
correction must be applied using the lookup table
below. The timekeeping accuracy can be verified by
comparing the FM30C256 time to a reference source.
offsetting
calibration
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
FM30C256-STR 功能描述:F-RAM 256K w/RTC Pwr Mon & Batt Switchover RoHS:否 存儲(chǔ)容量:512 Kbit 組織:64 K x 8 接口:SPI 工作電源電壓:2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube 制造商:Cypress Semiconductor
FM30C350Q (550606) 制造商:AMETEK Technical and Industrial Products 功能描述:Air Flow Meter, Analog, 3-in - 8.0 NPSC, 70-350 SCFM Flow Range, 2% Accuracy
FM30C475Q (550607) 制造商:AMETEK Technical and Industrial Products 功能描述:Air Flow Meter, Analog, 3-in - 8.0 NPSC, 95-475 SCFM Flow Range, 2% Accuracy
FM30L250Q (550866) 制造商:AMETEK Technical and Industrial Products 功能描述:Flow Meter, LCD Display in SCFM, 120VAC 50/60Hz Input, for 50-250 SCFM Flow Rate
FM30S250Q (550844) 制造商:AMETEK Technical and Industrial Products 功能描述:Flow Meter, Digital, 4-20mA Output, NEMA 1R Enclosure, for 50-250 SCFM Flow Rate
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