Device Architecture
Voltage Monitor
The Fusion Analog Quad offers a robust set of voltage-monitoring capabilities unique in the FPGA
industry. The Analog Quad comprises three analog input pads— Analog Voltage (AV), Analog
Current (AC), and Analog Temperature (AT)—and a single gate driver output pad, Analog Gate
(AG). There are many common characteristics among the analog input pads. Each analog input can
be configured to connect directly to the input MUX of the ADC. When configured in this manner
(Figure 2-66), there will be no prescaling of the input signal. Care must be taken in this mode not
to drive the ADC into saturation by applying an input voltage greater than the reference voltage.
The internal reference voltage of the ADC is 2.56 V. Optionally, an external reference can be
supplied by the user. The external reference can be a maximum of 3.3 V DC.
Off-Chip
AV
AC
AG
AT
Voltage
Monitor Block
Current
Monitor Block
Gate
Driver
Temperature
Monitor Block
Pads
On-Chip
Analog Quad
Prescaler
Prescaler
Prescaler
Power
MOSFET
Gate Driver
Digital
Input
Digital
Input
Digital
Input
Current
Monitor / Instr
Amplifier
Temperature
Monitor
To FPGA
(DAVOUTx)
To FPGA
(DACOUTx)
From FPGA
(GDONx)
To FPGA
(DATOUTx)
To Analog MUX
To Analog MUX
To Analog MUX
Figure 2-66 • Analog Quad Direct Connect
2-86
Preliminary v1.7
ACTEL [ Actel Corporation ]
