afs600 Actel Corporation, afs600 Datasheet - Page 129

• Manufacturer Part Number: afs600
• Description: Actel Fusion Programmable System Chips Mixed-signal Family With Optional Arm Support
• Manufacturer: Actel Corporation

Table 2-54
has a reduced number of available prescaler values.
Table 2-54 • Prescaler Control Truth Table—AV (x = 0), AC (x = 1), and AT (x = 3)
Table 2-55
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 2-55 • Analog Multiplexer Truth Table—AV (x = 0),
Table 2-56
Direct Analog Input switch for the AV, AC, and AT pins.
Table 2-56 • Direct Analog Input Switch Control Truth
Control Lines
Bx[2:0]
000
001
010
011
100
101
110
111
Notes:
1. These are the only valid ranges for the Temperature Monitor Block Prescaler.
2. LSB voltage equivalences assume VAREF = 2.56 V.
Control Lines
Control Lines
1
1
Bx[4]
Bx[5]
0
0
1
1
0
1
details the settings available to control the prescaler values of the AV, AC, and AT pins. Note that the AT pin
details the settings available to control the
details the settings available to control the
AC (x = 1), and AT (x = 3)
Table—AV (x = 0), AC (x = 1), and AT (x = 3)
Factor, Pad to
ADC Input
Scaling
0.15625
0.3125
Control Lines
0.625
1.25
10.0
20.0
2.5
5.0
Bx[3]
0
1
0
1
Direct Input Switch
LSB for an 8-Bit
Conversion
Prescaler
Direct input
Current amplifier /
temperature monitor
Not valid
ADC Connected To
Off
On
(mV)
0.5
64
32
16
8
4
2
1
2
LSB for a 10-Bit
A d v an c ed v1 . 4
Conversion
(mV)
0.125
0.25
0.5
16
8
4
2
1
Table 2-57
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 • Voltage Polarity Control Truth Table—
Table 2-58
down or enable the prescaler associated with the analog
inputs AV, AC, and AT.
Table 2-58 • Prescaler Op Amp Power-Down Truth Table—
Note: *The B3[6] signal for the AT pad should be kept at logic 0
2
Control Lines
Control Lines
to accept only positive voltages.
Bx[6]
Bx[7]
LSB for a 12-Bit
Conversion
0
1
0
1
details the settings available to either power
details the settings available to control the
0.03125
0.0625
AV (x = 0), AC (x = 1), and AT (x = 3)*
AV (x = 0), AC (x = 1), and AT (x = 3)
(mV)
0.125
0.25
0.5
Actel Fusion Programmable System Chips
4
2
1
2
Input Signal Polarity
0.127875 V
Full-Scale
0.25575 V
Voltage
Prescaler Op Amp
16.368 V
0.5115 V
8.184 V
4.092 V
2.046 V
1.023 V
Power-down
Operational
Negative
Positive
Range Name
0.125 V
0.25 V
0.5 V
16 V
8 V
4 V
2 V
1 V
2-115