ZIOL2201 datasheet(83/92 Pages) RENESAS

83 / 92 page

ZIOL2xxx Datasheet

April 26, 2016

Figure 10.2 Overload Counter Behavior in permanent Over-Current Situations

Channel

Driver

unlocked

Over-current

Reg[20]

Peak Counter

Reg[21:25]

Overload

Counter

Stored

Exception

Reg[18]

INT_L

Lock Reset

(lock counter

elapsed)

Assert time

Exception

(state signal)

Reg[20]

Assert time expired,

exception causes

INT_L = 0 (if configured)

locked

monitored current value exceeds the configured limit

overload counter equals

configured limit

time

INT_L follows state

signals (if configured)

INT_L follows stored

exceptions (if configured)

INT_L

Lock time

Read Acces of

Peak Counter

(via SPI)

Since a locked channel is in high-impedance (high-z) state, no over-current can occur while a channel is locked.

Therefore overload counter starts immediately counting down when the lock is enabled.

In case of a permanent over-temperature situation the die temperature may not decrease at the point in time the

channel control started locking both channels as shown in Figure 10.3. In this case the overload counter does not

stop counting up if the configured assert time is expired. Finally the overload counter reaches its maximum value

of 255 (0xFF).

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