SUMMIT MICROELECTRONICS, Inc.
•
300 Orchard City Drive, Suite 131
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Campbell, CA 95008
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Telephone 408-378-6461
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Fax 408-378-6586
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www.summitmicro.com
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© SUMMIT MICROELECTRONICS, Inc. 1998
2028-02 4/24/98
Characteristics subject to change without notice
SUMMIT
MICROELECTRONICS, Inc.
FEATURES
•
Precision Voltage Monitor
– Automatic VCC Supply Monitor
- Complementary reset outputs for complex
microcontroller systems
- Integrated memory write lockout function
- No external components required
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Watchdog Timer
– Nominal 1.6 second Timeout
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Memory Internally Organized 2K X 8
– Two Wire Serial Interface (I2C™)
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High Reliability
– Endurance: 1,000,000 erase/write cycles
– Data retention: 100 years
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8-Pin PDIP or SOIC Packages
Precision Voltage Supervisory Circuit
With Watchdog Timer and 16K I2C Memory
SMS2916
OVERVIEW
The SMS2916 is a power supervisory circuit that monitors
VCC (either in a 5V system or 3V system) and will generate
complementary reset outputs. The reset pins also act as
I/Os and may be used for signal conditioning. The
SMS2916 also has an on-board watchdog timer that has
a nominal time out period of 1.6 seconds.
The SMS2916 integrates a 16K-bit nonvolatile serial
memory. It features the industry standard I2C serial
interface allowing quick implementation in an end-users’
system.
BLOCK DIAGRAM
3 and 5 Volt Systems
Preliminary
5KHz
Oscillator
RESET
PULSE
GENERATOR
RESET
CONTROL
1.26V
VCC
7
RESET
2
RESET
VCC
8
VTRIP
SDA
SCL
6
4
5
GND
MEMORY
ARRAY
EEPROM
+
-
WATCHDOG
TIMER
1
WDI
2028 ILL2.1