M1AFS250-FGG256I Actel Corporation, M1AFS250-FGG256I Datasheet - Page 112

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

Device Architecture
Figure 2-77 • Temperature Monitor Quad
2- 96
Off-Chip
On-Chip
Pads
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
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,
and only two prescaler factors are available (16 V and 4 V ranges—refer to
AV
Prescaler
Digital
Input
Monitor Block
2-77). For improved temperature measurement accuracy, it is important to use the ATRTN pin for
Voltage
(DAVOUTx)
To FPGA
To Analog MUX
Monitor / Instr
AC
Amplifier
Digital
Prescaler
Current
Input
Monitor Block
(DACOUTx)
Current
To FPGA
Analog Quad
To Analog MUX
R e visio n 1
From FPGA
Gate Driver
MOSFET
(GDONx)
Power
AG
Driver
Gate
AT
Temperature
Digital
Table 2-54 on page
Input
Prescaler
Monitor
Monitor Block
Temperature
Transistor
Discrete
Bipolar
(DATOUTx)
To FPGA
ATRTN
To Analog MUX
2-132).