34920 datasheet(23/29 Pages) FREESCALE

23 / 29 page

Analog Integrated Circuit Device Data

Freescale Semiconductor

34920

FUNCTIONAL DESCRIPTION

FUNCTIONAL INTERNAL BLOCK DESCRIPTION

On the VV1_FB glitch condition, RESET behaves as follows:

• 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

tPERSIST, RESET will be asserted for a duration of

tDELAY. The 10 µs-to-30 µs persistence time specified in

tPERSIST is for ESD rejection. The reset trigger will be a

retriggerable one-shot, where the delay pulse will be

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.

ESD IMMUNITY

Refer to the Maximum Ratings table, page 5.

OVERTEMPERATURE PROTECTION

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.

Table 11. Ambient Temperature and Humidity

Condition

Temperature (°C)

% Relative Humidity

Operating

0 to 70

8.0 to 80

Storage

-40 to 150

5.0 to 80

34920 Datasheet(PDF) 23 Page - Freescale Semiconductor, Inc