Fusion Family of Mixed Signal FPGAs
Revision 4 2-83
Analog Quad
With the Fusion family, Microsemi introduces the Analog Quad, shown in Figure 2-65 on page 2-84, as
the basic analog I/O structure. The Analog Quad is a four-channel system used to precondition a set of
analog signals before sending it to the ADC for conversion into a digital signal. To maximize the
usefulness of the Analog Quad, the analog input signals can also be configured as LVTTL digital input
signals. The Analog Quad is divided into four sections.
The first section is called the Voltage Monitor Block, and its input pin is named AV. It contains a two-
channel analog multiplexer that allows an incoming analog signal to be routed directly to the ADC or
allows the signal to be routed to a prescaler circuit before being sent to the ADC. The prescaler can be
configured to accept analog signals between –12 V and 0 or between 0 and +12 V. The prescaler circuit
scales the voltage applied to the ADC input pad such that it is compatible with the ADC input voltage
range. The AV pin can also be used as a digital input pin.
The second section of the Analog Quad is called the Current Monitor Block. Its input pin is named AC.
The Current Monitor Block contains all the same functions as the Voltage Monitor Block with one
addition, which is a current monitoring function. A small external current sensing resistor (typically less
than 1 ) is connected between the AV and AC pins and is in series with a power source. The Current
Monitor Block contains a current monitor circuit that converts the current through the external resistor to
a voltage that can then be read using the ADC.
AG6 1 Output Analog Quad
AT6 1 Input Analog Quad
ATRETURN67 1 Input Temperature monitor return shared by
Analog Quads 6 and 7
Analog Quad
AV7 1 Input Analog Quad 7 Analog Quad
AC7 1 Input Analog Quad
AG7 1 Output Analog Quad
AT7 1 Input Analog Quad
AV8 1 Input Analog Quad 8 Analog Quad
AC8 1 Input Analog Quad
AG8 1 Output Analog Quad
AT8 1 Input Analog Quad
ATRETURN89 1 Input Temperature monitor return shared by
Analog Quads 8 and 9
Analog Quad
AV9 1 Input Analog Quad 9 Analog Quad
AC9 1 Input Analog Quad
AG9 1 Output Analog Quad
AT9 1 Input Analog Quad
RTCMATCH 1 Output MATCH RTC
RTCPSMMATCH 1 Output MATCH connected to VRPSM RTC
RTCXTLMODE[1:0] 2 Output Drives XTLOSC RTCMODE[1:0] pins RTC
RTCXTLSEL 1 Output Drives XTLOSC MODESEL pin RTC
RTCCLK 1 Input RTC clock input RTC
Table 2-36 • Analog Block Pin Description (continued)
Signal Name
Number
of Bits Direction Function
Location of
Details
