SMS64

Preliminary

Summit Microelectronics, Inc

2060 2.22 10/09/03

17

Channel E

Not Sequenced; Sequence Position null (7);

3.64V

Channel F

Not Sequenced; Sequence Position null (7);

1.34V

Power-Off in reverse order

RST_A# triggered by channels C, D, E, and F; cleared

on PUPB active

RST_B# triggered by channels B, D, E, and F

IRQ# triggered by channel A

VCCA, VCCB, and VCCC selected as precursors to

power-on sequencing

The resulting timing diagram is shown in Figures 9

and 10. Figure 9 shows the SMS64 sequencing the

supplies on and then monitoring for fault conditions.

Figure 10 shows the SMS64 sequencing the supplies

off then sequencing the supplies on.

VM

B,E

VCC

A

VCC

B

PUP

A

VM

A,D

PUP

B

VM

C,F

PUP

C

RST_A#

RST_B#

IRQ#

HEALTHY#

PWR_ON/OFF

V

PTHA

Sequence

Position 0

Sequence

Position 1

Sequence

Position 2

t

DPONB

t

PRTO

t

PRTO

t

PRTO

V

PTHB

V

PTHB

V

PTHD

V

PTHD

V

PTHB

Power-On

VCC

C

V

PTHC

t

DPONC

V

PTHC

t

DPONA

V

PTHA

V

PTHA

t

PRTO

Figure 9 - The SMS64 sequencing the supplies on and then monitoring for fault conditions.

APPLICATIONS INFORMATION (CONTINUED)