TPD7212FN

2020-07-03

8

© 2020

Toshiba Electronic Devices & Storage Corporation

7.4. Abnormal diagnosis of output voltage (VDD short, GND short)

Output voltage diagnosis operates for abnormal output voltage when the input signal changes, and for abnormal

output voltage when the input is stable. The criterion for diagnosing an error is the output judgment voltage

(VOM). When the input signal is H, it is output voltage <VOM, and when the input signal is L, the output voltage

≧

VOM. If it is diagnosed as abnormal, turn off all outputs and pull down to GND with an internal resistance (5

kΩ). Also latch DIAG1 at L. These are canceled at the rising edge of EN signal (L to H).

7.4.1. Abnormal diagnosis of output voltage when input signal changes

For output abnormality when the input signal changes, after a certain mask time (tmask), turn off all outputs and

pull down to GND with an internal resistance (5 kΩ). Also latch DIAG1 at L. These are canceled at the rising

edge of EN signal (L to H).

Figure 7.4 Abnormal diagnosis of output voltage when input signal changes

7.4.2. Abnormal diagnosis of output voltage when input signal is stable

For output abnormalities when the input signal is stable, without mask time (tmask), immediately turn off all

outputs and pull down to GND with internal resistance (5kΩ). Also latch DIAG1 at L. These are canceled at the

rising edge of EN signal (L to H).

Figure 7.5 Abnormal diagnosis of output voltage when input signal is stable

Note: INx: IN1,IN2,IN3,IN4,IN5,IN6 xU: UU,VU,WU xB: UB,VB,WB

t

mask