TH8065KDCAA MELEXIS [Melexis Microelectronic Systems], TH8065KDCAA Datasheet - Page 22

• Manufacturer Part Number: TH8065KDCAA
• Description: Voltage Regulator with LIN Transceiver and Watchdog
• Manufacturer: MELEXIS [Melexis Microelectronic Systems]

TH8065
Voltage Regulator with LIN Transceiver and Watchdog
VSUP
T>Tj
T<Tj
t<t
t<t
VCC
rr
rr
V
RES
t
t
t
t
Res
Res
Res
t
Res
rr
RESET
Current limitation
Thermal
Low voltage
Initialisation
Spike VSUP
active
shutdown
VSUP
Spike VCC
Figure 12 - Reset behaviour
Figure 13 - Output current of reset output vs. VCC voltage
3.8.2. Watchdog
The Watchdog can be used for observation of the connected microcontroller. It has to be triggered via the
WDI input and the time is defined via the capacity connected to the CWD input. The watchdog status will be
output via the reset pin.
With rising edges on WDI the watchdog time will be reset. If the WDI input isn’t triggered the internal circuitry
generates low pulses at the RESET pin with a time t
and a period of t
.
WD_R
WD-per
The CWD capacitor provides a wide adjustment range for the watchdog time.
With every rising edge on WDI the capacitor C
will be charged up to the threshold V
. If there is no new
WD
CWDL
trigger pulse on WDI, the following discharging of C
within the time t
will be done up to the lower
WD
WDL
threshold V
.
CWDL
TH8065 – Datasheet
Page 22 of 40
May 2006
3901008065
Rev 003