L9963E datasheet(148/184 Pages) STMICROELECTRONICS

148 / 184 page

Components Value

Unit

Max.

tolerance

Rating

Comments

Do not use thin film resistors on these lines connected to ECU

global pins. They could drift upon System Level ESD strikes.

Use thick film or metal foil instead.

In this configuration, the NTC voltage varies according to the following equation:

NTC voltage variation with temperature (single ended measurement)

VNTCT =VTREF× RNTCT

RNTCT +RPU

RNTCT =R25°C×eB 1TK − 1298.15

T°C =

B298.15+ln RPU×VNTC

VTREF−VNTC

R25°C

−273.15

(18)

L9963E provides both VNTC and VTREF measurements via SPI registers, allowing MCU to calculate cell

temperature as in the Eq. (18).

Figure 44. VNTC vs. temperature example (single ended measurement)

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

2.2

2.4

2.6

2.8

3.0

3.2

3.4

3.6

3.8

4.0

4.2

4.4

4.6

4.8

5.0

Temperature [°C]

VNTC vs. Temperature using an NTC with R25°C = 10 kΩ and B = 3984 K

VNTC @VTREF = 4.95 V

VNTC @VTREF = 4.8 V

VNTC @VTREF = 5.1 V

Typical operating range is from -20°C to +60°C

L9963E

NTC analog front end

DS13636 - Rev 12

page 148/184

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