SMS64 Datasheet, PDF (1/24 Pages) Summit Microelectronics, Inc. – Six-Channel Supply Monitor and Sequencing Controller

SMS64
Six-Channel Supply Monitor and Sequencing Controller
Preliminary
FEATURES & APPLICATIONS
INTRODUCTION
• Monitors and Controls up to 6 Power
Supplies
• Programmable Sequencing for both Power-
on and Power-off
• Programmable Threshold Sensors
• Programmable Reset and Interrupt Functions
• Programmable Watchdog/Longdog Timer
• Fault and Status Registers
• 4k-Bit Nonvolatile Memory
Applications
• Monitor and Control Distributed Power and
Point of Use Power Supplies
• Telecom
• Compact PCI
• Servers
• Multi-voltage Network Processors, DSPs,
ASICs
The SMS64 is a highly integrated power supply
monitor and controller. The SMS64 has six supply
managers, each individually programmable with
regard to threshold voltages, actions that can be taken
with either an under- or over-voltage condition and
how that manager will operate in sequencing the
power-on operation.
The managers can act independently or sequenced
with any other manager in the device. When the
managers work together the device can control the
sequence in which power is applied to the application
circuits. Each manager is assigned to a sequence
position which allows the device to perform power
supply sequencing in any order. For power-off
situations the SMS64 can sequence the supplies
either in the same order or reverse order from the
power-on sequence.
The SMS64 has two programmable Watchdog
timers, two programmable reset outputs and a
programmable IRQ# output. Using the I²C 2-wire
serial interface, a host system can communicate with
the SMS64 status register, optionally control power-on
via software and utilize 4 K-bits of nonvolatile memory.
SIMPLIFIED APPLICATIONS DRAWING
3.3V
2.7V
V+ OUT
ON/OFF
SET
GND
2.5V
UP
2.7V
RESET#
P ow er-O n
MR#
P W R _O N /O FF
VCC_CAP
SMS64
PUP_D
RST_A#
V+ OUT
SHDN _SET
GND
1.8V
ASIC
IRQ#
HEALTHY#
GND
V+ OUT
GND
ON/OFF
2.0V
DSP
2.7V
V+ OUT
GND
ON/OFF
1.5V
Power Supply Sequencing and System Start-up Initialization using the SMS64
This is an example application and the specific component values are purposely not shown. The SMS64 can be used with any combination of
MOSFETs, LDOs or DC/DC converters to optimize sequencing and minimize losses in the power chain.
© SUMMIT MICROELECTRONICS, Inc. 2003 • 1717 Fox Dr. • San Jose, CA 95131 • Phone [phone] • FAX [phone] • wwwsummitmicro.com
Characteristics Subject to Change Without Notice
2060 2.22 10/09/03
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