1
Characteristics subject to change without notice
2088 1.1 04/10/05
SMS48
SUMMIT
MICROELECTRONICS, Inc.
SUMMIT MICROELECTRONICS, Inc., 2005 1717 Fox Dr. San Jose, CA 95131 Phone 408-436-9890 FAX 408-436-9897
www.summitmicro.com
PRELIMINARY INFORMATION
1
(SEE LAST PAGE)
Operational from any of four Voltage Monitoring
Inputs
Four Independent Programmable Reset Outputs
Programmability allows monitoring any voltage
between 0.6V and 5.6V with no external
components
Programmable 5mV steps in the low range
Programmable Watchdog Timer
Programmable Reset Pulse Width
Fault Status Register
APPLICATIONS
Desktop/Notebook/Tablet Computers
Multi-voltage Systems
Telecom/Network Servers
Portable Battery-powered Equipment
Set-top Boxes
Data-storage Equipment
Quad Programmable Precision Supervisory Controller With Independent
Resets
FEATURES
INTRODUCTION
The SMS48 is a highly programmable voltage supply
controller and supervisory circuit designed specifically for
advanced systems that need to monitor multiple voltages.
The SMS48 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 SMS48 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 SMS48 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 I
2
C 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
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 SMS48.
V0
V1
V2
V3
RESET#0
RESET#3
VDD_CAP
RESET#1
RESET#2
I
2
C
3.3V
2.5V
1.8V
1.2V
SMS48
A2
A1 SDA SCL
7
6
9
10
1
16
2
3
14
MR#
Monitored
Supplies
15
WLDI
GND
8
13
12
11
5
4
0.1F
Vpullup (0 to +12V)
uP/DSP
ASIC/FPGA
Logic
LCD
From uP
RESET#
4
SMS48
2088 1.1 04/10/05
SUMMIT MICROELECTRONICS, Inc.
Preliminary Information
DC OPERATING CHARACTERISTICS
(Over Recommended Operating Conditions; Voltages are relative to GND)
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*Note -
Stresses beyond the listed Absolute Maximum Ratings may
cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions
outside those listed in the operational sections of this specification is not
implied. Exposure to any absolute maximum rating for extended
periods may affect device performance and reliability.
Temperature Under Bias ........................ 55C to 125C
Storage Temperature ............................. 65C to 150C
Lead Solder Temperature (10s) ........................... 300 C
Terminal Voltage with Respect to GND:
V
0
, V
1
, V
2
, and V
3
......... 0.3V to 6.0V
RESET#0-3 ..................... 0.3V to 15V
All Others ....................... 0.3V to 6.0V
Junction Temperature........................................150C
ESD Rating per JEDEC...................................2000V
Latch-Up testing per JEDEC...........................100mA
ABSOLUTE MAXIMUM RATINGS*
RECOMMENDED OPERATING CONDITIONS
Industrial Temperature Range............... 40C to +85C.
Commercial Temperature Range..............5C to +70C.
V
SUPPLY
Supply Voltage............................2.7V to 5.5V
V
SUPPLY
= Device supply voltage provided by the
highest V
X
input.
Package Thermal Resistance (
JA)
16 Lead SSOP.........................................23
o
C/W
Moisture Classification Level 1 (MSL 1) per J-STD- 020
RELIABILITY CHARACTERISTICS
Data Retention.........................................100 Years
Endurance........................................100,000 Cycles
Note 1: Low Range Hysteresis = 4.2 X (Vtrip - 0.5 volts) mV. For Vtrip = 1.0 volts, Hysteresis = 2.1 mV (0.21 %),
High Range Hysteresis = 12.6 X (Vtrip -0.5 volts) mV. For Vtrip = 5.0 volts, Hysteresis = 56.7 mV (1.13%).
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