L9963E datasheet(150/184 Pages) STMICROELECTRONICS

150 / 184 page

Components Value

Unit

Max.

tolerance

Rating

Comments

CESD

10%

100 V

Protect against ESD events and ISO spikes. Connect to

GND_ESD

RPU

kΩ

0.5 W

Provide VTREF/3 polarization for NTC typical value. Protect

VTREF pin in case of external short to battery/GND.

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.

RPD

kΩ

0.5 W

Provide VTREF/3 polarization for NTC typical value. Protect

AGND pin in case of external short to battery

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. Connect to AGND.

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

NTC voltage variation with temperature (differential measurement)

VNTCT =VTREF× RNTCT

RNTCT +2RPU

RNTCT =R25°C×eB 1TK − 1298.15

T°C =

B298.15+ln 2RPU×VNTC

VTREF−VNTC

R25°C

−273.15

(19)

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

temperature as in the Eq. (19).

Figure 46. VNTC vs. temperature example (differential 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 150/184

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