參數(shù)資料
型號(hào)： ADM1069AST
廠商： ANALOG DEVICES INC
元件分類： 電源管理
英文描述： 8-CHANNEL POWER SUPPLY SUPPORT CKT, PQFP32
封裝： MS-026-BBA, LQFP-32
文件頁(yè)數(shù)： 11/36頁(yè)
文件大?。?/td> 763K
代理商： ADM1069AST
ADM1069
Rev. A | Page 19 of 36
SEQUENCING ENGINE APPLICATION EXAMPLE
The application in this section demonstrates the operation of
the sequencing engine (SE). Figure 26 shows how the simple
building block of a single SE state can be used to build a power-
up sequence for a three-supply system.
Table 8 lists the PDO outputs for each state in the same SE
implementation. In this system, the presence of a good 5 V
supply on VP1 and the VX1 pin held low are the triggers required
for a power-up sequence to start. The sequence next intends to turn
on the 3.3 V supply, and then the 2.5 V supply (assuming successful
turn-on of the 3.3 V supply). Once all three supplies are good,
the PWRGD state is entered, where the SE remains until a fault
occurs on one of the three supplies, or until it is instructed to go
through a power-down sequence by VX1 going high.
Faults are dealt with throughout the power-up sequence on a
case-by-case basis. The following three sections (Sequence
describe the individual blocks and use the sample application in
Figure 26 to demonstrate the state machine’s actions.
04735-030
IDLE1
IDLE2
EN3V3
DIS3V3
DIS2V5
PWRGD
FSEL1
FSEL2
SEQUENCE
STATES
MONITOR FAULT
STATES
TIMEOUT
STATES
VX1 = 0
VP1 = 1
VP1 = 0
(VP1 + VP2) = 0
(VP1 + VP2 + VP3) = 0
(VP1 +
VP2) = 0
VP2 = 1
VP3 = 1
VP2 = 0
VX1 = 1
VP3 = 0
VP2 = 0
VP1 = 0
VX1 = 1
10ms
20ms
EN2V5
Figure 26. Sample Application Flow Diagram
Table 8. PDO Outputs for Each State
PDO Outputs
IDLE1
IDLE2
EN3V3
EN2V5
DIS3V3
DIS2V5
PWRGD
FSEL1
FSEL2
PDO1 = 3V3ON
0
1
0
1
PDO2 = 2V5ON
0
1
0
1
PDO3 = FAULT
0
1
0
1
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