ZIOL2201 datasheet(28/92 Pages) RENESAS

28 / 92 page

ZIOL2xxx Datasheet

April 26, 2016

The currently applied configuration data of the IC is stored in the configuration-register area which is implemented

as a register file. The configuration-register area can be uploaded via SPI command into an on-chip EEPROM for

non-volatile storage. While power-on-reset or also via SPI command the EEPROM content will be downloaded to

the configuration-register area.

Besides data for IC configuration the IC has certain status registers that can be used to monitor the internal status

of the IC. The status registers reflect the IC status as regards the occurrence of different driver channel overload

situations and their duration. Moreover, four alert phases (green, yellow, orange and red) indicate the die

temperature of the IC and in this combination the die temperature margin prior a thermal shut down of certain IC

building blocks. In principle, status registers are read-only registers. Some status registers are reset by reading

the register’s value. Furthermore, a write access to some status registers will cause certain control actions (for

more information refer to Table 3.7).

The read/write access to the Ics memory unit is provided by an SPI interface (refer to chapter 3.3.8). In order to

access a certain register or range of consecutive registers (block access) an 8-bit-address has to be applied

which consists of segment address (2bits) and register address (6 bits) as illustrated in Figure 3.9.

Figure 3.9

Memory Unit

Status

Segment 0

Segment 1

EEPROM

Address

Config-

Non-volatile

configuration

data

reserved

Segment 2 and 3 must not be used

Upload

Download

Memory block boundaries

which cannot be exceeded

while bock accesses

Memory control

Valid-flag

In case of a collapsing supply voltage while writing data into the EEPROM, the EEPROM data shall be suspected

to be corrupt. There is an additional build-in security feature to indicate this situation and to avoid that corrupt

EEPROM data is used for the IC configuration. In this combination a non-volatile flag (one bit EEPROM) is used

to indicate possibly not valid (corrupt) EEPROM data. This flag which is called valid-flag is set if the data are valid

or is cleared if the data are suspected to be corrupt. As shown in Figure 3.14 corrupt EEPROM data or any other

EEPROM problems can cause an internal exception.

The above mentioned feature is using the following procedure while performing an EEPROM write access:

Clearing the valid-flag.

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