SMS64
Preliminary
APPLICATIONS INFORMATION (CONTINUED)
Channel E
RST_B# triggered by channels B, D, E, and F
Not Sequenced; Sequence Position null (7);
Over-voltage; Programmable Threshold(VPTHE) =
3.64V
IRQ# triggered by channel A
VCCA, VCCB, and VCCC selected as precursors to
power-on sequencing
Channel F
Not Sequenced; Sequence Position null (7);
Over-voltage; Programmable Threshold(VPTHF) =
1.34V
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.
Power-Off in reverse order
RST_A# triggered by channels C, D, E, and F; cleared
on PUPB active
Power-On
Sequence
Position 0
Sequence
Position 1
Sequence
Position 2
VPTHA
VCCA
PUPA
tDPONA
VPTHD
VPTHD
VPTHA
VMA,D
VPTHA
VPTHB
VCCB
tDPONB
VPTHB
PUPB
VMB,E
VPTHB
VPTHC
VCCC
PUPC
tDPONC
VPTHC
VMC,F
PWR_ON/OFF
HEALTHY#
RST_A#
RST_B#
IRQ#
tPRTO
tPRTO
tPRTO
tPRTO
Figure 9 - The SMS64 sequencing the supplies on and then monitoring for fault conditions.
Summit Microelectronics, Inc
2060 2.22 10/09/03
17
SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
