71M6533G Maxim, 71M6533G Datasheet - Page 71

• Manufacturer Part Number: 71M6533G
• Description: The Teridian™ 71M6533 and 71M6534 are third-generation polyphase metering systems-on-chips (SoCs) with a 10MHz 8051-compatible MPU core, low-power RTC, flash, and LCD driver
• Manufacturer: Maxim

reference is removed.
In internal temperature compensation mode, the CE applies the following formula to determine the GAIN_ADJ
value. In this formula TEMP_X is the deviation from nominal or calibration temperature expressed in multiples
of 0.1 °C:
4.1.1 Temperature Compensation for VREF
The bandgap temperature is used to digitally compensate the power outputs for the temperature dependence
of VREF, using the CE register GAIN_ADJ (internal temperature compensation). Since the band gap amplifier
is chopper-stabilized via the CHOP_E[1:0] field, the most significant long-term drift mechanism in the voltage
Rev 2
Figure 34: Error Band for VREF over Temperature (Regular-Accuracy Parts)
Figure 35: Error Band for VREF over Temperature (High-Accuracy Parts)
-1200
-1600
-2000
-2400
-2800
-1200
2800
2400
2000
1600
1200
1200
GAIN
-400
-800
-400
-800
800
400
800
400
0
0
-40
-40
_
ADJ
Error Band (PPM) over Temperature (°C)
Error Band (PPM) over Temperature (°C)
-20
-20
=
16385
+
0
0
TEMP
±40 PPM/°C
±15 PPM/°C
±40 PPM/°C
±15 PPM/°C
_
2
20
20
X
14
⋅
PPMC
40
40
+
TEMP
60
60
_
X
2
23
2
⋅
PPMC
80
80
2
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