M1AFS250-FGG256I Actel Corporation, M1AFS250-FGG256I Datasheet - Page 109

• Manufacturer Part Number: M1AFS250-FGG256I
• Description: Actel Fusion Family Of Mixed Signal Fpgas
• Manufacturer: Actel Corporation

Table 2-37 • Recommended Resistor for Different Current Range Measurement
Figure 2-74 • Negative Current Monitor
Terminology
The accuracy of Fusion Current Monitor is ±2 mV minimum plus 5% of the differential voltage at the
input. The input accuracy can be translated to error at the ADC output by using
the gain of the Current Monitor Circuit, as described in the
bit mode, N = 8, V
2 LSBs.
where
Current Range
> 5 mA – 10 mA
> 10 mA – 20 mA
> 20 mA – 50 mA
> 50 mA – 100 mA
> 100 mA – 200 mA
> 200 mA – 500 mA
> 500 mA – 1 A
> 1 A – 2 A
> 2 A – 4 A
> 4 A – 8 A
> 8 A – 12 A
Accuracy
N is the number of bits
V
V
V
AREF
AV
AC
is the voltage at AV pad
is the voltage at AC pad
is the Reference voltage
–10.5 V
AREF
0 to
AVx
= 2.56 V, zero differential voltage between AV and AC, the Error (E
Current Monitor
E
ADC
R
SENSE
=
(
2mV
CMSTBx
ACx
+
0.05 V
R e v i s i o n 1
I
Recommended Minimum Resistor Value (Ohms)
AV
10 X
–
V
AC
"Current Monitor" section on page
)
×
(
10V
Actel Fusion Family of Mixed Signal FPGAs
VADC
0.0125 – 0.025
0.00625 – 0.02
) V
0.025 – 0.05
⁄
0.05 – 0.1
0.3 – 0.5
0.1 – 0.2
10 – 20
2.5 – 5
0.5 – 1
5 – 10
×
1 – 2
---------------- -
V
for MUXchannel
(see Table 2-36
to Analog MUX
AREF
2
N
number)
EQ
4. The 10 V/V gain is
ADC
2-90. For 8-
) is equal to
EQ 4
2- 93