AFS090 datasheet(110/334 Pages) MICROSEMI

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Device Architecture

2- 94

R e visio n 2

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 2-74). 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,

and only two prescaler factors are available (16 V and 4 V ranges—refer to Table 2-57 on page 2-132).

Figure 2-74 • Temperature Monitor Quad

Analog Quad

Voltage

Monitor Block

Current

Monitor Block

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

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