SMS46 Datasheet, PDF (1/17 Pages) Summit Microelectronics, Inc. – Quad Programmable Precision Supervisory Controller With Independent Resets and 4k-Bit Nonvolatile Memory

SUMMIT
MICROELECTRONICS, Inc.
SMS46
PRELIMINARY INFORMATION ¹ (SEE LAST PAGE)
Quad Programmable Precision Supervisory Controller With Independent
Resets and 4k-Bit Nonvolatile Memory
FEATURES
z Operational from any of four Voltage Monitoring
Inputs
z Four Independent Programmable Reset Outputs
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 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
INTRODUCTION
The SMS46 is a highly programmable voltage supply
controller and supervisory circuit designed specifically for
advanced systems that need to monitor multiple voltages.
The SMS46 can monitor four separate voltages without the
need of any external voltage divider circuitry. This allevi-
ates the need for factory-trimmed threshold voltages and
the use of external components to accommodate different
supply voltages and tolerances.
The SMS46 has four programmable independant reset
outputs to control different devices for varying reset condi-
tions such as UV, OV, watchdog and user pushbutton
applications.
The SMS46 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 serial
interface.
Programming of configuration, control and calibration val-
ues by the user is simplified with the SMX3200 interface
adapter and Windows GUI software obtainable from Sum-
mit Microelectronics.
SIMPLIFIED APPLICATION DRAWING
I²C
3.3V
Monitored 2.5V
Supplies 1.8V
1.2V
RESET#
From uP
7 6 9 10
16
2
3
14
V0
V1
V2
V3
1 _MR#
15 _WLDI
GND
A2 A1 SDA SCL
11
RESET#0
4
SMS46 RESET#1
RESET#2 ⁵
13
RESET#3
VDD_CAP
8
12
0.1µF
Vpullup (0 to +12V)
uP/DSP
ASIC/FPGA
Logic
LCD
Figure 1 - Precision Quad Power Supply Monitor can monitor any voltage over the range of 0.6V to 5.6V.
One of the four supplies must be above 2.7V to power the SMS46.
©SUMMIT MICROELECTRONICS, Inc., 2004 • 1717 Fox Dr. • San Jose, CA 95131 • Phone [phone] • FAX [phone] •
Characteristics subject to change without notice
2083 1.1 06/04/04
www.summitmicro.com
1