ZL8802 Datasheet, PDF (87/91 Pages) Intersil Corporation – Dual Channel/Dual Phase PMBus™ ChargeMode™ Control DC/DC Digital Controller

ZL8802
VMON_UV_FAULT_RESPONSE (F9h)
Definition: Configures the VMON undervoltage fault response as defined by the table below. Note: The retry time is the time between
restart attempts. If VMON is not used, set this response to 00h, which will disable VMON UV faults entirely
Paged or Global: Global
Data Length in Bytes: 1
Data Format: Bit Field.
Type: R/W
Protectable: Yes
Default Value: BFh (continuous retries)
Units: Retry time unit = 35ms
COMMAND
Format
Bit Position
Access
Function
Default Value
7
R/W
1
6
R/W
0
VMON_UV_FAULT_RESPONSE (F9h)
Bit Field
5
4
3
2
R/W
R/W
R/W
R/W
See Following Table
1
1
1
1
1
R/W
1
0
R/W
1
BIT
FIELD NAME
Response behavior, the device:
• Pulls SALRT low
7:6
• Sets the related fault bit in the
status registers. Fault bits are only
cleared by the CLEAR_FAULTS
command.
5:3
Retry Setting
2:0
Retry Delay
VALUE
DESCRIPTION
00 Fault ignored
01 Not used
10 Disable without delay and retry according to the setting in bits 5:3.
Output is disabled while the fault is present. Operation resumes and the output is enabled
11 _{when VMON rises above 105% of the VMON_UV_FAULT_LIMIT setting.}
000 No retry. The output remains disabled until the fault is cleared.
001-110 Not used
Attempts to restart continuously, without checking if the fault is still present, until it is
commanded OFF (by the CONTROL pin or OPERATION command or both), bias power is
111 removed, or another fault condition causes the unit to shut down. A retry is attempted after
VMON has risen above 105% of VMON_UV_FAULT_LIMIT. The time between the start of
each attempt to restart is set by the value in bits [2:0] multiplied by 35ms.
000-111
Retry delay time = (Value +1)*35ms. Sets the time between retries in 35ms increments.
Range is 35ms to 280ms.
SECURITY_LEVEL (FAh)
Definition: The device provides write protection for individual commands. Each bit in the UNPROTECT parameter controls whether its
corresponding command is writeable (commands are always readable). If a command is not writeable, a password must be entered in
order to change its parameter (i.e., to enable writes to that command). There are two types of passwords, public and private. The public
password provides a simple lock-and-key protection against accidental changes to the device. It would typically be sent to the device in the
application prior to making changes. Private passwords allow commands marked as nonwriteable in the UNPROTECT parameter to be
changed. Private passwords are intended for protecting default-installed configurations and would not typically be used in the application.
Each store (USER and DEFAULT) can have its own UNPROTECT string and private password. If a command is marked as nonwriteable in the
DEFAULT UNPROTECT parameter (its corresponding bit is cleared), the private password in the DEFAULT store must be sent in order to
change that command. If a command is writeable according to the default UNPROTECT parameter, it may still be marked as nonwriteable
in the user store UNPROTECT parameter. In this case, the user private password can be sent to make the command writeable.
The device supports four levels of security. Each level is designed to be used by a particular class of users, ranging from module
manufacturers to end users, as discussed below. Levels 0 and 1 correspond to the public password. All other levels require a private
password. Writing a private password can only raise the security level. Writing a public password will reset the level down to 0 or 1.
Figure 12 on page 88 shows the algorithm used by the device to determine if a particular command write is allowed.
Paged or Global: Global
Data Length in Bytes: 1
Data Format: Hex
Type: Read Byte
Protectable: No
Default Value: 01h
Units: N/A
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FN8760.1
December 11, 2015