參數(shù)資料
型號: 71M6521FE-IM/F
廠商: MAXIM INTEGRATED PRODUCTS INC
元件分類: 模擬信號調(diào)理
英文描述: SPECIALTY ANALOG CIRCUIT, QCC68
封裝: LEAD FREE, LQFN-68
文件頁數(shù): 64/103頁
文件大?。?/td> 1691K
代理商: 71M6521FE-IM/F
71M6521DE/71M6521FE
Energy Meter IC
DATA SHEET
OCTOBER 2010
v1.1
2005-2010 Teridian Semiconductor Corporation
Page: 63 of 103
A Maxim Integrated Products Brand
19-5370; 10/10
32767.5
32767.6
32767.7
32767.8
32767.9
32768
32768.1
32768.2
32768.3
32768.4
32768.5
-50
-25
0
25
50
crystal
curve fit
inverse curve
Figure 31: Crystal Compensation
The MPU Demo Code supplied with the Teridian Demo Kits has a direct interface for these coefficients and it directly controls
the RTC_DEC_SEC or RTC_INC_SEC registers. The Demo Code uses the coefficients in the form:
1000
2
_
100
_
10
_
)
(
2
CALC
Y
T
CALC
Y
T
CAL
Y
ppm
CORRECTION
+
+
=
Note that the coefficients are scaled by 10, 100, and 1000 to provide more resolution. For our example case, the coefficients
would then become (after rounding):
Y_CAL = 109, Y_CALC = 12, Y_CALC2 = 7
Alternatively, the mains frequency may be used to stabilize or check the function of the RTC. For this purpose, the CE provides
a count of the zero crossings detected for the selected line voltage in the MAIN_EDGE_X address. This count is equivalent to
twice the line frequency, and can be used to synchronize and/or correct the RTC.
Connecting 5V Devices
All digital input pins of the 71M6521DE/FE are compatible with external 5V devices. I/O pins configured as inputs do not
require current-limiting resistors when they are connected to external 5V devices.
相關(guān)PDF資料
PDF描述
71M6521FE-IGT/F SPECIALTY ANALOG CIRCUIT, QFP64
71M6531D-IMR/F 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, QCC68
71M6532D-IGTR/F 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQFP100
71M6532F-IGT/F 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQFP100
71M6531D-IM/F 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, QCC68
相關(guān)代理商/技術(shù)參數(shù)
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