M1AFS250-FGG256I Actel Corporation, M1AFS250-FGG256I Datasheet - Page 106

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

Device Architecture
Figure 2-71 • Analog Quad Current Monitor Configuration
2- 90
Off-Chip
On-Chip
Pads
Power
Current Monitor
The Fusion Analog Quad is an excellent element for voltage- and current-monitoring applications. In
addition to supporting the same functionality offered by the AV pad, the AC pad can be configured to
monitor current across an external sense resistor
a differential amplifier with 10x gain passes the amplified voltage drop between the AV and AC pads to
the ADC. The amplifier enables the user to use very small resistor values, thereby limiting any impact on
the circuit. This function of the AC pad does not limit AV pad operation. The AV pad can still be
configured for use as a direct voltage input or scaled through the AV prescaler independently of it’s use
as an input to the AC pad’s differential amplifier.
AV
Prescaler
Digital
Input
Monitor Block
Voltage
(DAVOUTx)
To FPGA
To Analog MUX
Monitor / Instr
AC
Prescaler
Amplifier
Digital
Current
Input
Monitor Block
(DACOUTx)
Current
To FPGA
Analog Quad
To Analog MUX
R e visio n 1
(Figure
From FPGA
Gate Driver
MOSFET
(GDONx)
Power
2-71). To support this current monitor function,
AG
Driver
Gate
AT
Temperature
Digital
Input
Prescaler
Monitor
Monitor Block
Temperature
(DATOUTx)
To FPGA
To Analog MUX