71M6543HT datasheet(21/75 Pages) MAXIM

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71M6543FT/71M6543HT/

71M6543GT/71M6543GHT

Energy Meter ICs

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Analog Front-End (AFE)

The AFE functions as a data acquisition system,

controlled by the MPU. When used with locally connected

sensors, as shown in Figure 2, the analog input signals

(IADC0-IADC7, VADC8-VADC10) are multiplexed to the

ADC input and sampled by the ADC.

The ADC output is decimated by the FIR filter and stored

in CE RAM where it can be accessed and processed by

the CE.

When remote isolated sensors are connected to the

71M6543FT/HT/GT/GHT using 71M6x03 remote sensor

interfaces, the input multiplexer is bypassed. Instead,

the extracted modulator bit stream is passed directly to a

dedicated decimation filter. The output of the decimation

filter is then directly stored in the appropriate CE RAM

location without making use of a multiplexer cycle.

Signal Input Pins

The 71M6543FT/HT/GT/GHT features eleven ADC inputs.

IADC0-IADC7 are intended for use as current sensor

inputs. These eight current sensor inputs can be config-

uredasfoursingle-endedinputs,or(morefrequently)can

be paired to form four differential inputs. For best perfor-

mance, it is recommended to configure the current sen-

sor inputs as differential inputs. The first differential input

(IADC0-IADC1) features a preamplifier with a selectable

gain of 1 or 8, and is intended for direct connection to a

shunt resistor sensor, and can also be used with a current

transformer (CT). The remaining differential pairs may be

Figure 2. 71M6543FT/HT/GT/GHT Operating with Local Sensors

∑ ADC

CONVERTER

VREF

MUX

VREF

VADC

FIR

IADC6

IADC0

VADC10 (VA)

IADC1

IADC7

71M6543FT/HT/GT/GHT

CE RAM

*IN = OPTIONAL NEUTRAL CURRENT

IN*

VADC10 (VB)

VADC10 (VC)

IADC2

IADC3

IADC4

IADC5

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