DEMOBOARD TLE 6368 Infineon Technologies, DEMOBOARD TLE 6368 Datasheet - Page 14

• Manufacturer Part Number: DEMOBOARD TLE 6368
• Description: BOARD DEMO FOR TLE 6368
• Manufacturer: Infineon Technologies

Specifications of DEMOBOARD TLE 6368

• Main Purpose: DC/DC, Step Down with LDO
• Voltage - Input: 5.5 ~ 60 V
• Regulator Topology: Buck
• Board Type: Fully Populated
• Utilized Ic / Part: TLE6368
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Outputs And Type: -
• Power - Output: -
• Voltage - Output: -
• Current - Output: -
• Frequency - Switching: -
• Other names: DEMOBOARDTLE6368IN

Data Sheet
Figure 6 Window watchdog timing definition
Figure 6 shows some guidelines for designing the watchdog trigger timing taking the
oscillator deviation of different devices into account. Of importance (w.c.) is the
maximum of the closed window and the minimum of the open window in which the
trigger has to occur.
The length of the OW and CW can be modified by SPI command. If a change of the
window length is desired during the Watchdog function is operating please send the SPI
command with the new timing with a ’Watchdog trigger Bit’ D15=1.In this case the next
CW will directly start with the new length.
A minimum time gap of > 1/48 of the actual OW/CW time between a ’Watchdog disable’
and ’Watchdog enable’ SPI-command should be maintained. This allows the internal
Watchdog counters to be resetted. Thus after the enable command the Watchdog will
start properly with a full CW of the adjusted length.
worst cases
definition
definition
f
f
OSC
OSC
=f
=f
OSCmax
OSCmin
Minimum open window time:
t
t
EOW, w.c.
closed window
ECW, w.c.
t
CW
=t
= ( t
= t
CW
CW
CW
(1+ )
+t
t
ECW
OW
)(1- )
open window
t
OWmin
t
OW
=t
CW
t
t
OWmin
EOW
reset start delay time after window
= end of open window
= t
reset delay time without trigger
OW
(not the same scale)
-
watchdog timeout
14
* ( t
t
SR
OW
= t
OW
+ 2* t
/2
CW
)
Example with:
t
t
t
t
CW
ECW, w.c.
EOW, w.c
owmin
=25% (oscillator deviation)
=128ms
reset duration time after window
(not the same scale)
Rev. 2.2, 2006-12-01
= 128(1.25) = 160ms
TLE 6368 / SONIC
= 32ms
= (128+128)(0.75) = 192ms
watchdog time-out
t
WDR
= t
RES