FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
On the VV1_FB glitch condition, RESET behaves as follows:
ESD IMMUNITY
Refer to the Maximum Ratings table, page 5.
• If the VV1_FB supply falls below VV1T and remains there
-
for less than tPERSIST (10 µs to 30 µs), RESET will not be
asserted. However, if the condition lasts longer than
OVERTEMPERATURE PROTECTION
t
PERSIST, RESET will be asserted for a duration of
tDELAY. The 10 µs-to-30 µs persistence time specified in
PERSIST is for ESD rejection. The reset trigger will be a
The 34920 implements overtemperature detection and
shutdown functions. The overtemperature circuitry monitors
the device’s internal temperature and activates thermal
shutdown circuitry when the temperature exceeds
TJ(SHUTDOWN) (155°C minimum, 175°C maximum). The
thermal shutdown condition is maintained until the die
temperature falls below TJ(ENABLE) (135°C minimum, 155°C
maximum). Each voltage regulator and motor driver circuit
has its own individual shutdown circuit.
t
retriggerable one-shot, where the delay pulse will be
10 µs to 30 µs for the delay timeout.
ENVIRONMENTAL SPECIFICATIONS
AMBIENT TEMPERATURE AND RELATIVE
HUMIDITY
Table 11 lists the temperature and relative humidity for
operating and storage conditions for the 34920.
Table 11. Ambient Temperature and Humidity
Temperature (°C)
0 to 70
% Relative Humidity
8.0 to 80
Condition
Operating
Storage
-40 to 150
5.0 to 80
34920
Analog Integrated Circuit Device Data
Freescale Semiconductor
23
FREESCALE [ Freescale ]
