ZIOL2201 datasheet(48/92 Pages) RENESAS

48 / 92 page

ZIOL2xxx Datasheet

April 26, 2016

Figure 3.17 Over-Temperature Lock Control

Comparator

Peak values

Over-

Temperature

Counter

(8bit)

AND

count

OVT

Counter == Assert_time

AND

set

To register IRQ_STATUS

Enables time based lock reset

OVT_TIME_BASE

[6:5]

0b00: 200 ns

0b01:

1 ms

0b10:

8 ms

0b11:

16 ms

rst

Over-Temperature Counter

Count-up:

if input signal count ==1

Count-down:

if input signal count == 0

- no overrun

- no underrun

Counter reset with

- write access to

MON_RST_COUNTER [17]

Data = 0bxxxxxxx1

- 0

1 transition of OVT_EN

From Over-Temperature

detector

SPI

OVT_LOCK_TIME

OVT_LOCK_TIME [05]

>C<

bit

reset

r / w

MON_OVT_PEAK

MON_OVT_PEAK [25]

>S<

bit

reset

r / rst

OVT_EN

OVT_LOCK_EN

OVT_LOCK_TIME_RST

OVT_TBASE

reseved

OVT_PFD_CTRL [09]

>C<

bit

reset

r / w

LINE_FAULT_EN

UNDER_VOLTAGE_EN

OVT_ASSERT_TIME

OVT_ASSERT_TIME [08]

>C<

bit

reset

r / w

Lock counter

clear

AND

Power

Fail

Detector

The Lock caused by an over-temperature displays that the die temperature has reached a critical level. That

forces a self protecting save state, it causes disabling the COM and the AUX channel by turning off all the HV

driver output stages (Figure 3.17).

The IC configuration allows disabling the lock mode operation for overload exceptions from both channels

(COM/AUX) and the exception from the die over-temperature detector. Since the lock mode operation prevents

the IC to be destroyed due to physical stress situation, the disabling is not recommended or shall be done with

particular caution only.

Disabled lock mode operations for the above mentioned building blocks will prevent generating the related

contribution to the interrupt signal at the INT_L pin. However, those exceptions can be retrieved by reading the

status register MON_STAT[20] (refer to chapter 3.3.9 and/or Figure 3.18).

Not depending on the lock mode operation the IC allows retrieving diagnostic information about the duration of an

exception (peak values). The corresponding IC configuration that is required for retrieving such diagnostic data is

illustrated above figures (Figure 3.15, Figure 3.16, and Figure 3.17).

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