TH8065 Datasheet, PDF (29/40 Pages) Melexis Microelectronic Systems – Voltage Regulator with LIN Transceiver and Watchdog

TH8065
Voltage Regulator with LIN Transceiver and Watchdog
Tantalum Capacitors
This type of capacitor has a low dependence of the capacitance and the ESR from the temperature and is
therefore well suited as VCC load capacitor.
Aluminium Capacitors
These capacitors show a strong influence of the capacitance and the ESR from the temperature. This
characteristic restrains the usability as load capacitor for the low drop regulator of TH8065.
4.3 Application Circuitry
VBAT
LIN-BUS
C_IN
100μ
100n
220p
TH8065
GND
GND
VSUP
VCC
EN
RESET
GND
TxD
BUS
RxD
CWD
CWD
GND
WDI
GND
100n
10μ...100μ
MCU
+5V
RST
Figure 21 - 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 21). This EMI-Filter makes sure that the RF injections into the IC from the BUS line have no
affect resp. will be limited.
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 capacitance (10nF) and the compliance with the
DC- and AC LIN bus parameters.
TH8065 – Datasheet
3901008065
Page 29 of 40
May 2006
Rev 003