78M6612-GTR/F/P2 Maxim Integrated Products, 78M6612-GTR/F/P2 Datasheet - Page 66
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78M6612-GTR/F/P2
Manufacturer Part Number
78M6612-GTR/F/P2
Description
Current & Power Monitors & Regulators
Manufacturer
Maxim Integrated Products
Datasheet
1.78M6612-IMF.pdf
(111 pages)
Specifications of 78M6612-GTR/F/P2
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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78M6612 Data Sheet
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:
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):
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.
3.5 Connecting 5V Devices
All digital input pins of the 78M6612 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.
66
Y_CAL = 109, Y_CALC = 12, Y_CALC2 = 7
CORRECTION
32768.5
32768.4
32768.3
32768.2
32768.1
32767.9
32767.8
32767.7
32767.6
32767.5
(
32768
ppm
-50
)
=
Y
_
Figure 30: Crystal Compensation
10
CAL
+
-25
T
⋅
Y
_
100
CALC
crystal
curve fit
inverse curve
0
+
T
2
⋅
Y
_
1000
CALC
25
2
50
DS_6612_001
Rev. 1.2
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