SMS45 Datasheet, PDF (1/20 Pages) Summit Microelectronics, Inc. – Quad Programmable Precision Cascade Sequencer and Supervisory Controller with 4k-Bit Nonvolatile Memory

SUMMIT
MICROELECTRONICS, Inc.
SMS45
PRELIMINARY INFORMATION ¹ (SEE LAST PAGE)
Quad Programmable Precision Cascade Sequencer and Supervisory
Controller with 4k-Bit Nonvolatile Memory
FEATURES
INTRODUCTION
z Operational from any of four Voltage Monitoring
Inputs
z Programmable Power-up Cascade Sequencing
z Programmability allows monitoring any voltage
between 0.6V and 5.6V with no external
components
z Programmable 5mV steps in the low range
z Programmable Watchdog Timer
z Programmable Reset Pulse Width
z Programmable Nonvolatile Combinatorial Logic
for generation of Reset
z Fault Status Register
z 4k-Bit Nonvolatile General Purpose Memory
APPLICATIONS
z Desktop/Notebook/Tablet Computers
z Multi-voltage Systems
z Telecom/Network Servers
z Portable Battery-powered Equipment
z Set-top Boxes
z Data-storage Equipment
The SMS45 is a nonvolatile user-programmable voltage
supply cascade sequencer and supervisory circuit de-
signed specifically for advanced systems that need to
monitor multiple voltages. The SMS45 can monitor four
separate voltages without the need of any external voltage
divider circuitry unlike other devices that need factory-
trimmed threshold voltages and external components to
accommodate different supply voltages and tolerances.
The SMS45 can also be used to enable DC/DC converters
or LDOs to provide a closed loop cascading of the supplies
during power -up.
The SMS45 watchdog timer has a user programmable
time-out period and it can be placed in an idle mode for
system initialization or system debug. All of the functions
are user accessible through an industry standard I²C 2-wire
serial interface.
Programming of configuration, control and calibration
values by the user is simplified with the SMX3200 interface
adapter and Windows GUI software obtainable from Sum-
mit Microelectronics.
SIMPLIFIED APPLICATION DRAWING
5V
I²C
0.1µF
Reset#
7 6 9 10
12 _{VDD_CAP} A2 A1 SDA SCL
4
16 V0
PUP#1
2 V1
3 V2
14 V3
SMS45 PUP#2 ⁵
1 _MR#
15 _WLDI
GND
RESET#
13
PUP#3
8
11
DC-DC
DC-DC
LDO
3.3V
2.5V
1.8V
Applications Schematic using the SMS45 Controller to provide closed loop power-up cascade sequenc-
ing and supervisory functions.
NOTE: THIS IS AN APPLICATIONS EXAMPLE ONLY. SOME PINS, COMPONENTS AND VALUES ARE NOT SHOWN.
©SUMMIT MICROELECTRONICS, Inc., 2004
• 1717 Fox Dr. • San Jose, CA 95131 • Phone [phone] • FAX [phone] •
Characteristics subject to change without notice
2079 1.2 05/24/04
www.summitmicro.com
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