SUMMIT
SMS24
MICROELECTRONICS, Inc.
Highly Programmble Voltage Supervisory Circuit
FEATURES
INTRODUCTION
The SMS24 is a configurable and in-system program-
mable second generation 8 pin supervisory circuit. This
single device is adaptable to provide the optimum func-
tionalityforagivensystemorsub-system. Userprogram-
mable functions available — reset pulse width, watchdog
delays,andvoltagemonitorthresholds—eliminateexter-
nal components and allow standardization to enhance
systemreliability. Additionally, 4Kbitsofgeneralpurpose
EEPROM is available on all configurations. The SMS24
isavailableinsixpinconfigurations,andiscompatiblewith
all Summit programmable devices and other I2C compo-
nents.
l User Programmable Device Configuration
l Guaranteed Reset Valid to VCC = 1V
l Immune to Short Negative VCC Transients
l Six Unique Pin Configurations
l User Programmable Feature Options:
w Reset Threshold Voltages
w Reset Pulse Widths
w Programmable Watchdog Timeouts
w Programmable Over- or Under-Voltage Sens-
ing
Programming of configuration, control and calibration
values by the user can be simplified with the interface
adapterandWindowsGUIsoftwareobtainablefromSum-
mit Microelectronics.
l High Reliability
w Endurance: 100,000 erase/write cycles
w Data retention: 100 years
DEVICE TYPES
Function
Device
Write
Protect
Pin
2nd
Voltage
Monitor
Manual
Reset
Input
Software
Code
NV
Memory
Reset#
Reset Watchdog
WDI Pin
WDI
001
010
011
100
101
110
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
2048 DTTable 2.1
NC
RESET#
NC
V
CC
RESET
SCL
SDA
NC
RESET#
NC
V
WP
SCL
SDA
WDI
RESET#
V
CC
CC
Device
Code
001
Device
Code
010
Device
Code
011
RESET
SCL
SDA
NC
GND
GND
GND
RESET#2
RESET#1
V
V
#
V
V
#
V
CC
LOW
CC
LOW
CC
Device
Code
100
Device
Code
101
Device
Code
110
MR#
SCL
SDA
RESET#
RESET
SCL
SDA
RESET#
WDI
SCL
SDA
V
V
V
SENSE
SENSE
SENSE
GND
GND
GND
2046 DT 1.0
©SUMMIT MICROELECTRONICS, Inc., 2001 • 300 Orchard City Dr., Suite 131 • Campbell, CA 95008 • Phone 408-378-6461 • FAX 408-378-6586 • www.summitmicro.com
Characteristics subject to change without notice
2048 2.4. 3/1/01
1