71M6543F Datasheet, PDF (151/157 Pages) Maxim Integrated Products – Selectable Gain of 1 or 8 for One Current Energy Meter ICs Metrology Compensation

71M6543F/H and 71M6543G/GH Data Sheet
6.8.2 71M6543 Analog Pins
Pin types: P = Power, O = Output, I = Input, I/O = Input/Output. The circuit number denotes the equivalent
circuit, as specified in Section 6.8.4.
Table 113: 71M6543 Analog Pins
Pin
Name
Type Circuit
Function
87
IADC0
86
IADC1
Differential or Single-Ended Analog Line Current Sense
Inputs. These pins are voltage inputs to the internal A/D
converter. Typically, they are connected to the outputs of
current sensors. Unused pins must be connected to
V3P3A.
68
IADC2
67
IADC3
When configured as differential inputs (i.e., by setting the
DIFFx_E control bits, where x = 0, 2, 4, 6) pins are paired to
I
6
form differential inputs pairs: IADC0-IADC1, IADC2-IADC3,
IADC4-IADC5, and IADC6-IADC7.
66
IADC4
65
IADC5
64
IADC6
63
IADC7
IADC2-IADC3, IADC4-IADC5, and IADC6-IADC7 can be
configured for communication with the 71M6xx3 remote
isolated sensor interface (i.e., by setting the RMTx_E
control bits, where x = 2, 4, 6). When configured as remote
sensor interfaces, these pins form balanced digital pairs for
bidirectional digital communications with a 71M6xx3
remote isolated sensor.
84
VADC8 (VA)
83
VADC9 (VB)
I
82
VADC10 (VC)
88
VREF
O
75
XIN
I
76
XOUT
O
Line Voltage Sense Inputs. These pins are voltage inputs
6
to the internal A/D converter. Typically, they are connected
to the outputs of resistor dividers. Unused pins must be
connected to V3P3A.
9
Voltage Reference for the ADC. This pin should be left
unconnected (floating).
Crystal Inputs. A 32 kHz crystal should be connected
across these pins. Typically, a 15 pF capacitor is also
connected from XIN to GNDA and a 10 pF capacitor is
8
connected from XOUT to GNDA. It is important to
minimize the capacitance between these pins. See the
crystal manufacturer data sheet for details. If an external
clock is used, a 150 mV (p-p) clock signal should be
applied to XIN, and XOUT should be left unconnected.
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