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| 型号： | ADM1069AST-REEL7 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 电源管理 |
| 英文描述： | 8-CHANNEL POWER SUPPLY SUPPORT CKT, PQFP32 |
| 封装： | MS-026-BBA, LQFP-32 |
| 文件页数： | 10/36页 |
| 文件大小： | 763K |
| 代理商： | ADM1069AST-REEL7 |
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ADM1069
Rev. A | Page 18 of 36
SEQUENCING ENGINE
OVERVIEW
The ADM1069 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 more. 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.
The SE state machine comprises 63 state cells. Each state has the
following attributes:
Monitors signals indicating the status of the eight input
pins, VP1 to VP3, VH, and VX1 to VX4.
Can be entered from any other state.
Three exit routes move the state machine onto a next state:
sequence detection, fault monitoring, and timeout.
Delay timers for the sequence and timeout blocks can be
programmed independently, and changed with each state
change. The range of timeouts is from 0 ms to 400 ms.
Output condition of the eight 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.
04735-029
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 VPn 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 could 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 7. Sample Sequence State Entries
State
Sequence
Timeout
Monitor
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.
If VP2 is not okay after 10 ms, go to
state DIS3V3.
If VP1 is not okay, go to state IDLE1.
DIS3V3
If VX1 is high, go to state IDLE1.
EN2V5
If VP3 is okay, go to state PWRGD.
If VP3 is not okay after 20 ms, go to
state DIS2V5.
If VP1 or VP2 is not okay, go to state FSEL2.
DIS2V5
If VX1 is high, go to state IDLE1.
FSEL1
If VP3 is not okay, go to state DIS2V5.
If VP1 or VP2 is not okay, go to state FSEL2.
FSEL2
If VP2 is not okay, go to state DIS3V3.
If VP1 is not okay, go to state IDLE1.
PWRGD
If VX1 is high, go to state DIS2V5.
If VP1, VP2, or VP3 is not okay, go to state
FSEL1.
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