Rainbow Electronics 71M6542G - Manual (Page 158)

158 © 2008–2011 Teridian Semiconductor Corporation v1.1
6.8.2 Analog Pins
Table 118: Analog Pins
Pin
(64 pin)
Pin
(100-pin)
Name Type Circuit Description
55
54
44
43
87
86
68
67
IAP-
IAN
IBP-
IBN
I 6
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.
52
--
82
83 VA
VB
†
I 6
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.
56 88 VREF O 9
Voltage Reference for the ADC. This pin should be left
unconnected (floating).
48
49 75
76 XIN
XOUT I
O
8
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.
†
Pin VB only available on 71M6542F.