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71M6545/71M6545H Data Sheet
It is assumed that an offset voltage Voff appears at the positive amplifier input. With all switches, as
controlled by CROSS (an internal signal), 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 alternately appears 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] ( I/O RAM 0x2106[3:2] ) control field controls the behavior of CROSS. On the
first CK32 rising edge after the last multiplexer state of its sequence, the multiplexer waits one additional
CK32 cycle before beginning a new frame. At the beginning of this cycle, the value of CROSS is 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.
CHOP_E[1:0] has four states: positive, reverse, and two toggle states. In the positive state, CHOP_E[1:0]
= 01, CROSS is held low. In the reverse state, CHOP_E[1:0] = 10, CROSS is held high. The two
automatic toggling states are selected by setting CHOP_E=11 or CHOP_E=00.
Figure 7: CROSS Signal with CHOP_E = 00
Figure 7 shows CROSS over two accumulation intervals when CHOP_E[1:0] = 00: At the end of the
first interval, CROSS is high, at the end of the second interval, CROSS is low. Operation with
CHOP_E[1:0] = 00 does not require control of the chopping mechanism by the MPU.
In the second toggle state, CHOP_E[1:0] = 11, CROSS does not toggle at the end of the last multiplexer
cycle in an accumulation interval.
2.2.8
71M6xx3 Isolated Sensor Interface
2.2.8.1 General Description
Non-isolating sensors, such as shunt resistors, can be connected to the inputs of the 71M6545/H via a
combination of a pulse transformer and a 71M6xx3 IC (a top-level block diagram of this sensor interface
is shown in Figure 27 ). The 71M6xx3 receives power directly from the 71M6545/H via a pulse
transformer and does not require a dedicated power supply circuit. The 71M6xx3 establishes 2-way
communication with the 71M6545/H, supplying current samples and auxiliary information such as sensor
temperature via a serial data stream.
Up to three 71M6xx3 Isolated Sensors can be supported by the 71M6545/H. When a remote sensor
interface is enabled, the two analog current inputs become re-configured and a digital remote sensor
interface. For example, when control bit RMT2_E = 1, the IADC2-IADC3 analog pins are re-configured as
the digital interface pins to the remote sensor.
Each 71M6xx3 Isolated Sensor consists of the following building blocks:
?
Power supply that derives power from pulses received from the 71M6545/H
?
v2
Bi-directional digital communications interface
21
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