71M6541D Datasheet, PDF (159/166 Pages) Maxim Integrated Products – 0.1% Accuracy Over 2000:1 Current Range Energy Meter ICs

71M6541D/F/G and 71M6542F/G Data Sheet
6.9.2 Analog Pins
Table 120: Analog Pins
Pin
(64 pin)
Pin _Name
(100-pin)
Type Circuit
55
87 IAP-
54
86 IAN
I
6
44
68 IBP-
43
67 IBN
52
82 VA
--
83
VB^†
I
6
56
88 VREF
O
9
48
49
75 XIN
I
76 XOUT
O
8
† _{Pin VB only available on 71M6542F/G.}
Description
Differential or single-ended 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 tied to
V3P3A.
Pins IBP-IBN may be configured for communication with
the remote sensor interface (71M6x01). When RMT_E =
1 (I/O RAM 0x2709[3]), the IBP-IBN pins become
balanced differential pair. If unused, RMT_E must be
zero and IBP-IBN must tied to V3P3A.
Line Voltage Sense Inputs: These pins are voltage
inputs to the internal A/D converter. Typically, they are
connected to the outputs of resistor dividers. Unused
pins must be tied to V3P3A.
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 connected from XOUT to GNDA. It
is important to minimize the capacitance between these
pins. See the crystal manufacturer datasheet 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.