L9912 datasheet(46/84 Pages) STMICROELECTRONICS

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Electrical specifications

L9912

46/84

DocID029639 Rev 2

5.3.22

Temperature sensor

The sensor generates a voltage proportional to the absolute temperature of the die and

makes it available at TEMP_OUT pin. It works over the whole temperature range, with a

resolution of 10.5 mV ±1 mV/ºK.

The sensor output voltage is forwarded to pin AIN1 of the microcontroller [12] to allow

temperature check.

Figure 20. Temperature sensor output voltage vs. temperature

Note:

The voltage output of the sensor is related to the absolute temperature of the silicon

junctions. Junction temperature and ambient temperature must be related taking into

account the power dissipated by the device and the thermal resistance Rthje between the

silicon and the environment around the application board.

Typical curve expressions (VTEMP_OUT in V, T in °C):

VTEMP_OUT = εTEMP • T+ (VTEMP- 130 • εTEMP) = 10.5 • 10-3 • T+ 2.733

T[°C] = εTEMP-1 • VTEMP_OUT + 130 - VTEMP / εTEMP = 95.24 • VTEMP_OUT - 260.3

5tRR

nRST_SP reaction time

I(nRST_SP) = 1 mA

s

6tRP

nRST_SP pulse time

I(nRST_SP) = 1 mA

1.3

2.4

3.4

7tVDDUV

VDD under-voltage filter time

Digital filter time

µs

Table 31. Reset output (nRST_SP) electrical characteristics (continued)

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

Table 32. Temperature sensor (TEMP_OUT)

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

1VTEMP

Output voltage

T = 130 ºC

4.041

4.098

4.155

εTEMP

Voltage temperature drift

-40 °C ≤ T ≤ 130 °C

9.5

10.5

11.5

mV/K

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