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L9963E Scheda tecnica(PDF) 147 Page - STMicroelectronics

Il numero della parte L9963E
Spiegazioni elettronici  Automotive Multicell battery monitoring and balancing IC
PDF  184 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9963E Scheda tecnica(HTML) 147 Page - STMicroelectronics

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Components Value
Unit
Max.
tolerance
Rating
Comments
RISO
6.8
Ω
10%
1/10 W
Resistor for limiting inrush current during hotplug
6.9
NTC analog front end
6.9.1
Single ended measurement
In the single ended approach the external NTC is connected between PCB global input and battery pack GND.
This strategy requires only a single PCB global pin for each external NTC. However, even if L9963E AGND
is connected to pack GND at PCB level, measurement precision could be affected by shifts between the two
grounds, which can be seen as a VTREF variation. In order to increase measurement precision, connection of the
NTC to AGND through an additional PCB connector or Differential Measurement can be exploited.
Figure 43. Example of NTC single ended measurement
L9963E
VTREF
GPIO4
RPU
CFIL
RFIL
RNTC
AGND
PACK
GND
Table 83. NTC analog front end BOM for single ended measurement
Components Value
Unit
Max.
tolerance
Rating
Comments
RNTC
10
kΩ
1%
Recommended external NTC typical value. The
NTCALUG02A103F is a good option for evaluation purposes
RFIL
3.9
kΩ
10%
1.5 W
Protect the GPIO in case of external STG/STB. Limit the
ESD inrush current. Filter the NTC signal: cut-off frequency
is
fC= 1
2πRFILCFIL.
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.
CFIL
100
nF
10%
100 V
Protect against ESD events and ISO spikes. Filter the NTC
signal: cut-off frequency is
fC= 1
2πRFILCFIL.Connectto
AGND
RPU
10
kΩ
1%
0.5 W
Provide VTREF/2 polarization for NTC typical value. Protect
VTREF pin in case of external short to battery/GND.
L9963E
NTC analog front end
DS13636 - Rev 12
page 147/184



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