ZIOL2201 datasheet(85/92 Pages) RENESAS

85 / 92 page

ZIOL2xxx Datasheet

April 26, 2016

Figure 10.4 Overload Counter Behavior in typical Over-Temperature Situations

Channel

Driver

unlocked

Over-temperature

Reg[20]

Peak Counter

Reg[21:25]

Overload

Counter

Assert time

Exception

(state signal)

Reg[20]

locked

monitored temperature value exceeds the configured limit

overload counter equals

configured limit

time

Lock time

Read Acces of

Peak Counter

(via SPI)

unlocked

A.3. Overload Counter and Lock Reset Methods

The ZIOL2xxx has two special status registers (register[16:17]). Those status registers do not contain information

about the IC status. Thus reading those registers will always result to the value zero for each register. However

those registers are used to perform special resets within the COM, AUX, and temperature lock circuits. In addition

to that register[16] can also reset the WURQ exception.

The way to perform a particular reset operation is writing into the register (write

24 pulse access; please refer to

chapter 3.3.9) the bit-value “1” at a certain bit position which is assigned to the desired reset operation.

•

Bit[0]:

Reset over-temperature counter and reset of the internal and

stored over-temperature (OVT) exception

•

Bit[1]:

Reset the COM over-current counter and reset of the internal and stored

COM over-current (OVT) exception

•

Bit[2]:

Reset the AUX COM over-current counter and reset of the internal and

stored AUX over-current (OVT) exception

24 Note: IC versions ZIOL2xx2 do not allow any write access.

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