ZIOL2201 datasheet(84/92 Pages) RENESAS

84 / 92 page

ZIOL2xxx Datasheet

April 26, 2016

Figure 10.3 Overload Counter Behavior in permanent Over-Temperature Situations

Channel

Driver

unlocked

Over-temperature

Reg[20]

Peak Counter

Reg[21:25]

Overload

Counter

Stored

Exception

Reg[18]

INT_L

Lock Reset has no effect

Assert time

Exception

(state signal)

Reg[20]

Assert time expired,

exception causes

INT_L = 0 (if configured)

locked

monitored temperature value exceeds the configured limit

overload counter equals

configured limit

time

Lock time

Read Acces of

Peak Counter

(via SPI)

MAX = 255

In this situation a lock reset due to an elapsed internal lock counter of the temperature lock control circuit (Figure

3.17) will not release the locks which are in effect on both channels. However, the locks can be released by

writing into register[16] (write pulse function).

In typical over-temperature situations the overload counter may reach a value that is greater as the configured

limit. This is due to the thermal inertia of the system since the temperature sensor and the thermal sources are not

on the same place on the silicon die. When the lock has been released, the there is a little difference in the

behavior when reading the peak register as shown in Figure 10.4. The peak register is loaded with the overload

counter value again as long the over-temperature situation is present.

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