參數(shù)資料
型號(hào)： ADM1069
廠商： Analog Devices, Inc.
英文描述： SUPER SEQUENCER-TM WITH MARGINING CONTROL AND AUXILIARY ADC INPUTS
中文描述： 超時(shí)序與裕度控制以及輔助ADC輸入商標(biāo)
文件頁(yè)數(shù)： 17/32頁(yè)
文件大?。?/td> 626K
代理商： ADM1069
Preliminary Technical Data
ADM1069
SEQUENCING ENGINE
OVERVIEW
The ADM1069’s sequencing engine (SE) provides the user with
powerful and flexible control of sequencing. The SE implements
a state machine control of the PDO outputs, with state changes
conditional on input events. SE programs can enable complex
control of boards such as power-up and power-down sequence
control, fault event handling, interrupt generation on warnings,
and so on. A watchdog function that verifies the continued
operation of a processor clock can be integrated into the SE
program. The SE can also be controlled via the SMBus, giving
software or firmware control of the board sequencing.
Rev. PrB | Page 17 of 32
The SE state machine comprises 63 state cells. Each state has the
following attributes:
Monitors signals indicating the status of the 8 input pins, VP1
to VP3, VH, and VX1 to VX4.
Can be entered from any other state.
Three exit routes move the state machine on to a next state:
sequence detection, fault monitoring, and timeout.
Delay timers for the sequence and timeout blocks can be
programmed independently, and change with each state
change. The range of timeouts is from 0 ms to 400 ms.
Output condition of the 8 PDO pins is defined and fixed
within a state.
Transition from one state to the next is made in less than
20 μs, which is the time needed to download a state definition
from EEPROM to the SE.
0
SEQUENCE
TIMEOUT
MONITOR
FAULT
STATE
Figure 25. State Cell
The ADM1069 offers up to 63 state definitions. The signals
monitored to indicate the status of the input pins are the
outputs of the SFDs.
WARNINGS
The SE also monitors warnings. These warnings can be
generated when the ADC readings violate their limit register
value or when the secondary voltage monitors on VP1–3 and
VH. The warnings are all OR’ed together and are available as a
single warning input to each of the three blocks that enable
exiting from a state.
SMBus JUMP/UNCONDITIONAL JUMP
The SE can be forced to advance to the next state uncondition-
ally. This enables the user to force the SE to advance. Examples
of where this might be used include moving to a margining
state or debugging a sequence. The SMBus jump or go-to
command can be seen as another input to sequence and
timeout blocks, which provide an exit from each state.
Table 6. Sample Sequence State Entries
State
Sequence
IDLE1
If VX1 is low , go to state IDLE2.
IDLE2
If VP1 is okay, go to state EN3V3.
EN3V3
If VP2 is okay, go to state EN2V5.
Timeout
If VP2 is not okay after 10 ms, go to
state DIS3V3.
If VP3 is not okay after 20 ms, go to
state DIS2V5.
Monitor
If VP1 is not okay, go to state IDLE1.
DIS3V3
EN2V5
If VX1 is high, go to state IDLE1.
If VP3 is okay, go to state PWRGD.
If VP1 or VP2 is not okay, go to state FSEL2.
DIS2V5
FSEL1
FSEL2
PWRGD
If VX1 is high, go to state IDLE1.
If VP3 is not okay, go to state DIS2V5.
If VP2 is not okay, go to state DIS3V3.
If VX1 is high, go to state DIS2V5.
If VP1 or VP2 is not okay, go to state FSEL2.
If VP1 is not okay, go to state IDLE1.
If VP1, VP2, or VP3 is not okay, go to state
FSEL1.
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