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Data Sheet
POWER-UP
SMBus
DEVICE
ADM1168
(V CC > 2.5V)
E
CONTROLLER
R
U
E
P
R
O
M
L
D
D
A
T
A
LATCH A
A
M
L
D
P
D
LATCH B
FUNCTION
(OV THRESHOLD
EEPROM
Figure 24. Configuration Update Flow Diagram
ON VP1)
UPDATING THE SEQUENCING ENGINE
SE functions are not updated in the same way as regular
configuration latches. The SE has its own dedicated 512-byte
EEPROM for storing state definitions, providing 63 individual
states, each with a 64-bit word (one state is reserved). At power-up,
the first state is loaded from the SE EEPROM into the engine
itself. When the conditions of this state are met, the next state is
loaded from the EEPROM into the engine and so on. The loading
of each new state takes approximately 10 μs.
To alter a state, the required changes must be made directly to
the EEPROM. RAM for each state does not exist. The relevant
alterations must be made to the 64-bit word, which is then
uploaded directly to the EEPROM.
INTERNAL REGISTERS
The ADM1168 contains a large number of data registers. The
principal registers are the address pointer register and the
configuration registers.
Address Pointer Register
The address pointer register contains the address that selects one
of the other internal registers. When writing to the ADM1168, the
first byte of data is always a register address that is written to the
address pointer register.
Configuration Registers
The configuration registers provide control and configuration
for various operating parameters of the ADM1168. See the
AN-721 Application Note .
EEPROM
The ADM1168 has two 512-byte cells of nonvolatile, electrically
erasable, programmable, read-only memory (EEPROM), from
Address 0xF800 to Register Address 0xFBFF. The EEPROM is
used for permanent storage of data that is not lost when the
ADM1168 is powered down. One EEPROM cell, 0xF800 to
0xF9FF, contains the configuration data, user information and,
if enabled, any fault records of the device; the other section, 0xFA00
to 0xFBFF, contains the state definitions for the SE. Although
referred to as read-only memory, the EEPROM can be written to,
as well as read from, using the serial bus in exactly the same way
as the other registers.
The major differences between the EEPROM and other registers
are as follows:
? An EEPROM location must be blank before it can be
written to. If it contains data, the data must first be erased.
? Writing to the EEPROM is slower than writing to the RAM.
? Writing to the EEPROM should be restricted because it has
a limited write/cycle life of typically 10,000 write operations
due to the usual EEPROM wear-out mechanisms.
The first EEPROM is split into 16 (0 to 15) pages of 32 bytes each.
Page 0 to Page 4, from Address 0xF800 to Address 0xF89F, hold
the configuration data for the applications on the ADM1168
(such as the SFDs and PDOs). These EEPROM addresses are
the same as the RAM register addresses, prefixed by F8. Page 5
to Page 7, from Address 0xF8A0 to Address 0xF8FF, are reserved.
Page 8 to Page 11 are available for customer use to store any
information that may be required by the customer in their
application. Customers can store information on Page 12 to
Page 15, or these pages can store the fault records written by
the sequencing engine if users have decided to enable writing
of the fault records for different states.
Data can be downloaded from the EEPROM to the RAM in one
of the following ways:
? At power-up, when Page 0 to Page 4 are downloaded.
? By setting Bit 0 of the UDOWNLD register (0xD8), which
performs a user download of Page 0 to Page 4.
When the sequence engine is enabled, it is not possible to access
the section of EEPROM from Address 0xFA00 to Address 0xFBFF.
The sequence engine must be halted before it is possible to read
or write to this range. Attempting to read or write to this range if
the sequence engine is not halted generates a no acknowledge,
or NACK.
Read/write access to the configuration and user EEPROM ranges
from Address 0xF800 to Address 0xF89F and Address 0xF900 to
Address 0xF9FF depends on whether the black box fault recorder
is enabled. If the fault recorder is enabled and one or more states
have been set as fault record trigger states, then it is not possible
to access any EEPROM location in this range without first halting
the black box. Attempts to read or write to this EEPROM range
while the fault recorder is operating are acknowledged by the
device but do not return any useful data or modify the EEPROM in
any way.
Rev. A | Page 21 of 28
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