ADM1066ACP-U3 Просмотр технического описания (PDF) - Analog Devices

Номер в каталоге

Компоненты Описание

производитель

ADM1066ACP-U3

Super Sequencer™ with Margining Control and Auxiliary ADC Inputs

Analog Devices 

ADM1066

SEQUENCING ENGINE APPLICATION EXAMPLE

The application in this section demonstrates the operation of

the SE. Figure 27 shows how the simple building block of a

single SE state can be used to build a power-up sequence for a

3-supply system.

Table 7 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 intends to turn

on the 3.3 V supply next, 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 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 sections, which describe the

individual blocks, use this sample application to demonstrate

the state machine’s actions.

SEQUENCE

STATES

IDLE1

VX1 = 0

IDLE2

MONITOR FAULT

STATES

VP1 = 1

EN3V3

VP1 = 0

10ms

TIMEOUT

STATES

VP2 = 1

EN2V5

(VP1 + VP2) = 0

20ms

VP3 = 1

DIS3V3

VX1 = 1

(VP1 + VP2 + VP3) = 0

FSEL1

(VP1 +

VP2) = 0

PWRGD

DIS2V5

VP2 = 0

VX1 = 1

VX1 = 1

VP3 = 0

FSEL2

VP1 = 0

VP2 = 0

Figure 27. Sample Application Flow Diagram

Table 7. PDO Outputs for Each State

PDO Outputs

IDLE1 IDLE2

PDO1 = 3V3ON

0

0

PDO2 = 2V5ON

0

0

PDO3 = FAULT

0

0

EN3V3

1

0

0

EN2V5

1

1

0

DIS3V3

0

1

1

DIS2V5

1

0

1

PWRGD

1

1

0

FSEL1

1

1

1

FSEL2

1

1

1

Rev. 0 | Page 18 of 32

Share Link: