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71M6534 Datasheet(PDF) 12 Page - Maxim Integrated Products

Part No. 71M6534
Description  Exceeds IEC 62053/ANSI C12.20 Standards
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

71M6534 Datasheet(HTML) 12 Page - Maxim Integrated Products

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71M6533/G/H and 71M6534/H Data Sheet
FDS_6533_6534_004
12
Rev 2
Table 3: ADC RAM Locations
Signal Number
Address
(HEX)
Name
Signal Number
Address
(HEX)
Name
0
0x00
IA
5
0x05
VC
1
0x01
VA
6
0x06
ID
2
0x02
IB
0x0A
0x0A
TEMP
3
0x03
VB
0x0B
0x0B
VBAT
4
0x04
IC
1.2.5 Voltage References
The device includes an on-chip precision bandgap voltage reference that incorporates auto-zero techniques.
The reference is trimmed in production to minimize errors caused by component mismatch and drift. The
result is a voltage output with a predictable temperature coefficient.
The amplifier within the reference is chopper stabilized, i.e. the polarity can be switched by the MPU using
CHOP_E[1:0] (I/O RAM 0x2002[5:4]). The CHOP_E[1:0] field enables the MPU to operate the chopper
circuit in regular or inverted operation, or in toggling mode. When the chopper circuit is toggled in between
multiplexer cycles, DC offsets on the measured signals will automatically be averaged out.
The general topology of a chopped amplifier is shown in Figure 2.
Figure 2: General Topology of a Chopped Amplifier
It is assumed that an offset voltage Voff appears at the positive amplifier input. With all switches, as
controlled by CROSS, in the A position, the output voltage is:
Voutp – Voutn = G (Vinp + Voff – Vinn) = G (Vinp – Vinn) + G Voff
With all switches set to the B position by applying the inverted CROSS signal, the output voltage is:
Voutn – Voutp = G (Vinn – Vinp + Voff) = G (Vinn – Vinp) + G Voff, or
Voutp – Voutn = G (Vinp – Vinn) - G Voff
Thus, when CROSS is toggled, e.g. after each multiplexer cycle, the offset will alternately appear on the
output as positive and negative, which results in the offset effectively being eliminated, regardless of its
polarity or magnitude.
When CROSS is high, the connection of the amplifier input devices is reversed. This preserves the overall
polarity of that amplifier gain; it inverts its input offset. By alternately reversing the connection, the
amplifier’s offset is averaged to zero. This removes the most significant long-term drift mechanism in the
voltage reference. The CHOP_E[1:0] field controls the behavior of CROSS. The CROSS signal will reverse
the amplifier connection in the voltage reference in order to negate the effects of its offset. On the first
CK32 rising edge after the last multiplexer state of its sequence, the multiplexer will wait one additional
CK32 cycle before beginning a new frame. At the beginning of this cycle, the value of CROSS will be
updated according to the CHOP_E[1:0] field. The extra CK32 cycle allows time for the chopped VREF to
settle. During this cycle, MUXSYNC is held high. The leading edge of MUXSYNC initiates a pass through
the CE program sequence. The beginning of the sequence is the serial readout of the four RTM words.
G
-
+
Vinp
Voutp
Voutn
Vinn
CROSS
A
B
A
B
A
B
A
B


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