
Fusion Family of Mixed Signal FPGAs
Revision 4
2-95
Temperature Monitor
The final pin in the Analog Quad is the Analog Temperature (AT) pin. The AT pin is used to implement an
accurate temperature monitor in conjunction with an external diode-connected bipolar transistor
(
Figure 2-76). For improved temperature measurement accuracy, it is important to use the ATRTN pin for
the return path of the current sourced by the AT pin. Each ATRTN pin is shared between two adjacent
Analog Quads. Additionally, if not used for temperature monitoring, the AT pin can provide functionality
similar to that of the AV pad. However, in this mode only positive voltages can be applied to the AT pin,
Figure 2-76 Temperature Monitor Quad
Analog Quad
AV
AC
AT
Voltage
Monitor Block
Current
Monitor Block
AG
Digital
Input
Power
MOSFET
Gate Driver
Current
Monitor / Instr
Amplifier
Temperature
Monitor
Digital
Input
Digital
Input
Pads
To Analog MUX
To FPGA
(DAVOUTx)
To FPGA
(DACOUTx)
To FPGA
(DATOUTx)
On-Chip
Gate
Driver
Temperature
Monitor Block
Off-Chip
From FPGA
(GDONx)
Prescaler
ATRTN
Discrete
Bipolar
Transistor