FG256 datasheet(90/197 Pages) MICROSEMI

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SmartFusion DC and Switching Characteristics

2- 78

R e v i sio n 1 2

Temperature Monitor

Unless otherwise noted, temperature monitor performance is specified with a 2N3904 diode-connected

bipolar transistor from National Semiconductor or Infineon Technologies, nominal power supply voltages,

with the output measured using the internal voltage reference with the internal ADC in 12-bit mode and

62.5 Ksps. After digital compensation. Unless otherwise noted, the specifications pertain to conditions

where the SmartFusion cSoC and the sensing diode are at the same temperature.

Table 2-94 • Temperature Monitor Performance Specifications

Specification

Test Conditions

Min.

Typical

Max.

Units

Input diode temperature range

–55

150

°C

233.2

378.15

Temperature sensitivity

2.5

mV/K

Intercept

Extrapolated to 0K

Input referred temperature offset

error

At 25°C (298.15K)

±1

1.5

°C

Gain error

Slope of BFSL vs. 2.5 mV/K

±1

2.5

% nom.

Overall accuracy

Peak error from ideal transfer function

±2

±3

°C

Input referred noise

At 25°C (298.15K) – no output averaging

°C rms

Output current

Idle mode

100

µA

Final measurement phases

µA

Analog settling time

Measured to 0.1% of final value, (with

ADC load)

From TM_STB (High)

µs

From ADC_START (High)

105

µs

AT parasitic capacitance

500

Power supply rejection ratio

DC (0–10 KHz)

1.2

0.7

°C/V

Input referred temperature

sensitivity error

Variation due to device temperature

(–40°C to +100°C). External temperature

sensor held constant.

0.005

0.008

°C/°C

Temperature monitor (TM)

operational power supply current

requirements (per temperature

monitor instance, not including ADC

or VAREFx)

VCC33A

200

µA

VCC33AP

150

µA

VCC15A

µA

Note:

All results are based on averaging over 64 samples.

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