ZL2106 Datasheet, PDF (31/35 Pages) Intersil Corporation – 6A Digital-DC Synchronous Step-Down DC-DC Converter

ZL2106
Table 21. Snapshot Parameters
Byte
Description
31:22
Reserved
21:20
Vin
19:18
Vout
17:16
Iout,ave
15:14
Iout,peak
13:12
Duty cycle
11:10
Internal temp
9:8
External temp
7:6
fsw
5
Vout status
4
Iout status
3
Input status
2
Temp status
1
CML status
0
Mfr specific status
Format
Linear
Linear
Vout Linear
Linear
Linear
Linear
Linear
Linear
Linear
Byte
Byte
Byte
Byte
Byte
Byte
The SNAPSHOT_CONTROL command enables the
user to store the snapshot parameters to Flash memory
in response to a pending fault as well as to read the
stored data from Flash memory after a fault has
occurred. Table 22 describes the usage of this
command. Automatic writes to Flash memory
following a fault are triggered when any fault threshold
level is exceeded, provided that the specific fault’s
response is to shut down (writing to Flash memory is
not allowed if the device is configured to re-try
following the specific fault condition).
It should also be noted that the device’s V_DD voltage
must be maintained during the time when the device is
writing the data to Flash memory; a process that
requires between 700-1400 µs depending on whether
the data is set up for a block write. Undesirable results
may be observed if the device’s V_DD supply drops
below 3.0 V during this process.
Table 22. SNAPSHOT_CONTROL Command
Data
Value
Description
Copies current SNAPSHOT values from
1 Flash memory to RAM for immediate
access using SNAPSHOT command.
Writes current SNAPSHOT values to Flash
2 memory. Only available when device is
disabled.
In the event that the device experiences a fault and
power is lost, the user can extract the last SNAPSHOT
parameters stored during the fault by writing a 1 to
SNAPSHOT_CONTROL (transfers data from Flash
memory to RAM) and then issuing a SNAPSHOT
command (reads data from RAM via SMBus).
7.16 Non-Volatile Memory and Device Security
Features
The ZL2106 has internal non-volatile memory where
user configurations are stored. Integrated security
measures ensure that the user can only restore the
device to a level that has been made available to them.
Refer to Section 6.4 “Start-up Procedure,” for details
on how the device loads stored values from internal
memory during start-up.
During the initialization process, the ZL2106 checks
for stored values contained in its internal memory. The
ZL2106 offers two internal memory storage units that
are accessible by the user as follows:
1. Default Store: A power supply module
manufacturer may want to protect the module from
damage by preventing the user from being able to
modify certain values that are related to the
physical construction of the module. In this case,
the module manufacturer would use the Default
Store and would allow the user to restore the
device to its default setting but would restrict the
user from restoring the device to the factory
settings.
2. User Store: The manufacturer of a piece of
equipment may want to provide the ability to
modify certain power supply settings while still
protecting the equipment from modifying values
that can lead to a system level fault. The equipment
manufacturer would use the User Store to achieve
this goal.
Please refer to Application Note AN33 for details on
how to set specific security measures via the
I²C/SMBus interface.
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Data Sheet Revision 2/19/2009
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