AFS090 datasheet(98/334 Pages) MICROSEMI

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Device Architecture

2- 82

R e visio n 2

Analog Quad

With the Fusion family, Microsemi introduces the Analog Quad, shown in Figure 2-63 on page 2-83, 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

Ω) 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

Output

Analog Quad

AT6

Input

Analog Quad

ATRETURN67

Input

Temperature monitor return shared by

Analog Quads 6 and 7

Analog Quad

AV7

Input

Analog Quad 7

Analog Quad

AC7

Input

Analog Quad

AG7

Output

Analog Quad

AT7

Input

Analog Quad

AV8

Input

Analog Quad 8

Analog Quad

AC8

Input

Analog Quad

AG8

Output

Analog Quad

AT8

Input

Analog Quad

ATRETURN89

Input

Temperature monitor return shared by

Analog Quads 8 and 9

Analog Quad

AV9

Input

Analog Quad 9

Analog Quad

AC9

Input

Analog Quad

AG9

Output

Analog Quad

AT9

Input

Analog Quad

RTCMATCH

Output

MATCH

RTC

RTCPSMMATCH

Output

MATCH connected to VRPSM

RTC

RTCXTLMODE[1:0]

Output

Drives XTLOSC RTCMODE[1:0] pins

RTC

RTCXTLSEL

Output

Drives XTLOSC MODESEL pin

RTC

RTCCLK

Input

RTC clock input

RTC

Table 2-36 • Analog Block Pin Description (continued)

Signal Name

Number

of Bits

Direction

Function

Location of

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