參數(shù)資料
型號(hào)： M41T82SM6E
廠商： STMICROELECTRONICS
元件分類： 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取
英文描述： 1 TIMER(S), REAL TIME CLOCK, PDSO8
封裝： 0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8
文件頁(yè)數(shù)： 25/61頁(yè)
文件大?。?/td> 983K
代理商： M41T82SM6E
M41T82-M41T83
Clock operation
Doc ID 12578 Rev 12
The on-chip capacitance can be calculated as follows:
where ACS is the sign.
For example:
●
CLOAD (12h = x0000000) = 12.5 pF
●
CLOAD (12h =11001000) = 3.5 pF (sign is negative)
●
CLOAD (12h = 00100111) = 17.4 pF
With the analog calibration adjusted to its lowest value, the oscillator will see a minimum of
3.5 pF load capacitance as shown on the bottom row of Table 7.
Note:
These are typical values, and the total load capacitance seen by the crystal will include
approximately 1-2 pF of package and board capacitance in addition to the analog calibration
register value.
Any invalid value of analog calibration will result in the default capacitance of 25 pF.
The combination of analog and digital trimming can give up to –93 to +156 ppm of the total
adjustment.
Figure 18 represents a typical curve of clock ppm adjustment versus the analog calibration
value. This curve may vary with different crystals, so it is good practice to evaluate the
crystal to be used with an M41T8x device before establishing the adjustment values for the
application in question.
Figure 18.
Clock accuracy vs. on-chip load capacitance
[]pF
25
.
0
)
decimal
,
value
0
AC
:
6
AC
(
ACS
2
1
CLOAD
+
=
ai13906
DECREASING LOAD CAP.
-20.0
0.0
20.0
40.0
60.0
80.0
100.0
-5.0
-18.0 -15.0
-10.0
0.0
5.0
9.75
Analog Calibration
Value, AC,
register 0x12
PPM
A
DJ
USTM
ENT
OFFSET TO
CXI, CXO (pF)
NET EQUIV. LOAD
CAP., C LOAD, (pF)
10
3.5
5.0
7.5
12.5
15
17.4
0xC8 0xBC
0xA8
0x94
0x00
0x14
0x27
INCREASING LOAD CAP.
SLOWER
FASTER
XO
XI
Crystal
Oscillator
CXO
CXI
CLOAD =
CXI + CXO
CXI * CXO
On-Chip
相關(guān)PDF資料
PDF描述
M41T83ZMY6E 1 TIMER(S), REAL TIME CLOCK, PDSO18
M41T83ZMY6F 1 TIMER(S), REAL TIME CLOCK, PDSO18
M41T82SM6F 1 TIMER(S), REAL TIME CLOCK, PDSO8
M41T82ZM6E 1 TIMER(S), REAL TIME CLOCK, PDSO8
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M41T82SM6F 功能描述:實(shí)時(shí)時(shí)鐘 Serial I2C bus RTC 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
M41T82SMY6E 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial RTC with battery switchover
M41T82SMY6F 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial RTC with battery switchover
M41T82SQ6E 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial RTC with battery switchover
M41T82SQ6F 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial RTC with battery switchover
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