SUMMIT
MICROELECTRONICS, Inc.
SMS48
PRELIMINARY INFORMATION
1
(SEE LAST PAGE)
Quad Programmable Precision Supervisory Controller With Independent
Resets
FEATURES
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
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
I
2
C
Vpullup (0 to +12V)
7
3.3V
2.5V
Monitored
Supplies 1.8V
1.2V
RESET#
From uP
16
2
3
14
1
15
V0
V1
V2
V3
MR#
WLDI
GND
8
0.1µF
VDD_CAP
12
6
9
10
11
4
5
13
LCD
A2 A1 SDA SCL
RESET#0
uP/DSP
ASIC/FPGA
Logic
SMS48
RESET#1
RESET#2
RESET#3
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.
©SUMMIT MICROELECTRONICS, Inc., 2005 • 1717 Fox Dr. • San Jose, CA 95131 • Phone 408-436-9890 • FAX 408-436-9897 •
2088 1.1 04/10/05
Characteristics subject to change without notice
www.summitmicro.com
1
SMS48
Preliminary Information
FUNCTIONAL BLOCK DIAGRAM
VDD_CAP
50kΩ
CONFIGURATION
REGISTER
11
RESET#0
MR#
1
V0
16
NV DAC +
REF
–
PROGRAMMABLE
RESET PULSE
GENERATOR
4
RESET#1
5
RESET#2
V1
2
NV DAC +
REF
–
13
RESET#3
V2
3
NV DAC +
REF
–
SERIAL
BUS
CONTROL
LOGIC
9
SDA
10
SCL
7
A2
6
A1
V3
14
NV DAC +
REF
–
PROGRAMMABLE
WATCHDOG
TIMER
SUPPLY
ARBITRATION
50kΩ
15
WLDI
VDD_CAP
V0
V1
V2
V3
12
8
VDD_CAP
GND
2
2088 1.1 04/10/05
SUMMIT MICROELECTRONICS, Inc.
SMS48
Preliminary Information
PIN CONFIGURATION
PIN NAMES
Pin
1
MR#
V
1
V
2
RESET#1
RESET#2
A1
A2
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
0
WLDI
V
3
RESET#3
VDD_CAP
RESET#0
SCL
SDA
Name
MR#
V
1
V
2
RESET#1
RESET#2
A1
A2
GND
SDA
SCL
RESET#0
VDD_CAP
RESET#3
V
3
WLDI
V
0
Function
Manual reset input
Voltage supply and monitor
input
Voltage supply and monitor
input
Reset#1 output
Reset#2 output
Address input
Address input
Power supply return
Serial data I/O
Serial data clock
Reset#0 output
Power supply output
Reset#3 output
Voltage supply and monitor
input
Watchdog timer interrupt
Voltage supply and monitor
input
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
SUMMIT MICROELECTRONICS, Inc.
2088 1.1 04/11/05
3
SMS48
Preliminary Information
ABSOLUTE MAXIMUM RATINGS*
Temperature Under Bias ........................ –55°C to 125°C
Storage Temperature ............................. –65°C to 150°C
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.......................…….....…...150°C
ESD Rating per JEDEC……………………..….…..2000V
Latch-Up testing per JEDEC………..…….......…±100mA
*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.
RECOMMENDED OPERATING CONDITIONS
Industrial Temperature Range............... –40ºC to +85ºC.
Commercial Temperature Range..............–5ºC to +70ºC.
V
SUPPLY
Supply Voltage............................2.7V to 5.5V
V
SUPPLY
=
Device supply voltage provided by the
highest V
X
input.
Package Thermal Resistance (θJA)
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
DC OPERATING CHARACTERISTICS
(Over
Recommended Operating Conditions; Voltages are relative to GND)
Symbol
Parameter
Notes
1V min. refers to a valid reset out-
put being generated
Min.
1.0
2.7
Typ.
Max.
5.5
5.5
Unit
V
V
VDD
Operating supply voltage
Read/Write operations: at
least one of the V inputs must be at
or above VDD min.
VDD
≤
5.5V; V
0
trip point 4.7V; V
1
, V
2
,
V
3
= GND; MR# = VDD; all outputs
floating
Configuration register access
Reset threshold voltage range V
0
to
V
3
(5mV increments)
Reset threshold voltage range V
0
to
V
3
(15mV increments)
V
PTH
is the programmed threshold
setpoint within the V
PTH
Range
See Note 1 below
MR# and WLDI pins
I
SINK
= 1mA, V
VDD_CAP
≥
2.7V
I
SINK
= 200µA, V
VDD_CAP
= 1.0V
IDD
Supply current
200
400
3
µA
mA
V
V
%
mV
kΩ
V
PTH
Programmable threshold
Range (low range)
V
PTH
Programmable threshold
Range (high range)
V
PTHACC
V
HYST
R
PU
V
OL
V
IL
V
IH
Programmable threshold
Accuracy
V
RST
hysteresis
Pull-up resistance
Low voltage output
Input threshold
0.6
1.8
–1.0
V
PTH
TBD
50
1.875
5.625
1.0
0.3
0.3
0.6
0.7
×
V
DD
V
V
V
V
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%).
4
2088 1.1 04/10/05
SUMMIT MICROELECTRONICS, Inc.
SMS48
Preliminary Information
AC OPERATING CHARACTERISTICS
(Over
Recommended Operating Conditions; Voltages are relative to GND)
Symbol
Parameter
Notes
Min.
19
38
75
150
Typ.
25
50
100
200
20
OFF
Max.
31
63
125
250
Unit
ms
ms
ms
ms
µs
—
t
PRTO
Programmable reset pulse
width
t
DRST
Vin to RESET# delay
100mV overdrive
300
400
800
1600
3200
6400
300
200
500
1000
2000
4000
8000
ms
ms
ms
ms
ns
ns
t
PWDTO
Programmable Watchdog
timer period
600
1200
2400
4800
Minimum pulse required to bring
Reset active
T
MR
T
DMRRST
MR# input pulse width
Delay from MR# low to
RESET# low
SUMMIT MICROELECTRONICS, Inc.
2088 1.1 04/11/05
5
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