TH8061 Datasheet, PDF (25/36 Pages) Melexis Microelectronic Systems – Voltage Regulator with integrated LIN Transceiver

TH8061
Voltage Regulator with integrated LIN Transceiver
Tantalum Capacitors
This type of capacitor has a low dependence of the capacity and the ESR from the temperature and is
therefore well suitable as VCC load capacity.
Aluminum Capacitors
These capacitors show a strong influence of the capacity and the ESR from the temperature. These
characteristic restrains the usability as load capacity for the low drop regulator of TH8061.
4.3 Application Circuitry
rev.prot. diode
VBAT
C_IN
100µ
LIN-
BUS
10
100n
220p
or
optional
TH8061
VSUP VCC
EN RESET
GND _TxD
BUS _RxD
C_L
10µ...100µ
33uH
RC-Filter
100p
LC-Filter
82p
MCU
+5V
Control unit
100n _{with LIN protocol}
Figure 25 - Application circuit (slave node)
4.4 EMI Supressing
To minimize the influence of EMI on the bus line a 220pF capacitor should be connected directly to the BUS
pin (see Figure 25). This EMI-Filter makes sure that the RF imissions into the IC from the BUS line have no
affect resp. will be limited.
The value of the filter capacity can be adjusted to the size of the LIN network. 220pF should be used for
bigger networks. Values from 333pF up to 1nF should be used for middle to small LIN networks. Finally the
size of the filter capacity influences the effectiveness of the EMI suppressing in observation of the maximum
LIN bus capacity of 10nF.
Alternatively to a pure C-filter it is also possible to use LC- or RC-filter. The dimension of C, L or R, L
depends on the corner frequency, the maximum LIN bus capacity (10nF) and the compliance with the DC-
and AC LIN bus parameters.
TH8061 – Datasheet
3901008061
Page 25 of 36
June 2004
Rev 007