AFS090 datasheet(148/334 Pages) MICROSEMI

148 / 334 page

Device Architecture

2- 13 2

R e v isio n 2

Table 2-57 details the settings available to control the prescaler values of the AV, AC, and AT pins. Note

that the AT pin has a reduced number of available prescaler values.

Table 2-58 details the settings available to control the MUX within each of the AV, AC, and AT circuits.

This MUX determines whether the signal routed to the ADC is the direct analog input, prescaled signal,

or output of either the Current Monitor Block or the Temperature Monitor Block.

Table 2-59 details the settings available to control the Direct Analog Input switch for the AV, AC, and AT

pins.

Table 2-60 details the settings available to control the polarity of the signals coming to the AV, AC, and AT

pins. Note that the only valid setting for the AT pin is logic 0 to support positive voltages.

Table 2-57 • Prescaler Control Truth Table—AV (x = 0), AC (x = 1), and AT (x = 3)

Control Lines

Bx[2:0]

Scaling

Factor, Pad to

ADC Input

LSB for an

8-Bit

Conversion2

(mV)

LSB for a

10-Bit

Conversion2

(mV)

LSB for a

12-Bit

Conversion2

(mV)

Full-Scale

Voltage

Range

Name

000 1

0.15625

16.368 V

16 V

001

0.3125

8.184 V

8 V

010 1

0.625

4.092 V

4 V

011

1.25

0.5

2.046 V

2 V

100

2.5

0.25

1.023 V

1 V

101

5.0

0.5

0.125

0.5115 V

0.5 V

110

10.0

0.25

0.0625

0.25575 V

0.25 V

111

20.0

0.5

0.125

0.03125

0.127875 V

0.125 V

Notes:

1. These are the only valid ranges for the Temperature Monitor Block Prescaler.

2. LSB voltage equivalences assume VAREF = 2.56 V.

Table 2-58 • Analog Multiplexer Truth Table—AV (x = 0), AC (x = 1), and AT (x = 3)

Control Lines Bx[4]

Control Lines Bx[3]

ADC Connected To

Prescaler

Direct input

Current amplifier temperature monitor

Not valid

Table 2-59 • Direct Analog Input Switch Control Truth Table—AV (x = 0), AC (x = 1), and AT (x = 3)

Control Lines Bx[5]

Direct Input Switch

Off

Table 2-60 • Voltage Polarity Control Truth Table—AV (x = 0), AC (x = 1), and AT (x = 3)*

Control Lines Bx[6]

Input Signal Polarity

Positive

Negative

Note:

*The B3[6] signal for the AT pad should be kept at logic 0 to accept only positive voltages.

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