SMS66 Datasheet, PDF (1/26 Pages) Summit Microelectronics, Inc. – Six-Channel Power Supply Supervisor and Cacsade Sequence Controller

SMS66
Preliminary Information¹ (See Last Page)
Six-Channel Power Supply Supervisor and Cacsade Sequence Controller
FEATURES & APPLICATIONS
• Very accurate monitor function – 5mV steps
• Monitors and sequences up to six supplies
• Programmable Power-on/-off sequencing
• Monitors internal temperature sensor
• Operates from 12V or 3.3V supply
• Monitors 12V input and VDD
• Monitors two general-purpose 10-bit ADC inputs
• Programmable threshold limits (2 OV/2 UV) for
each monitored input
• Programmable RESET, HEALTHY and FAULT
functions
• 4k-bit general purpose nonvolatile memory
• I²C 2-wire serial bus for programming
configuration and monitoring status, including
10-bit ADC conversion results
Applications
• Monitor and Sequence Distributed Power and
Point of Load Power Supplies
• Multi-voltage Processors, DSPs, ASICs used in
Telecom, CompactPCI or server systems
INTRODUCTION
The SMS66 is a very accurate programmable power
supply supervisor that monitors and sequences. It
controls sequencing time and position of up to six
isolated or non-isolated distributed or POL DC/DC
converters. The monitor supervisory function has two
independent UV and OV settings for each supply and
can be set in 5mV steps. The SMS66 also sequences
the power supplies in any order using enable outputs
with programmable polarity.
The SMS66 monitors six power supply channels as
well as VDD, 12V input, two general-purpose analog
inputs and an internal temperature sensor using a 10-
bit ADC. The 10-bit ADC can measure the value on
any one of the input channels and output the
conversion data via the I²C bus.
Using the I²C interface, a host system can
communicate with the SMS66 status register,
optionally control Power-on/off, and utilize 4 K-bits of
nonvolatile memory.
SIMPLIFIED APPLICATIONS DRAWING
12VIN (+8V to +15V Range)
VDD (+2.7V to +5.5V Range)
I²C
BUS
External
or
Internal
TEMP
SENSOR
SDA
SCL
A2
PUP_A
AIN1 _SMS66 ^VMA
External or
Internal
REFERENCE
VREF_OUT
VREF_ADC
PUP_F
DC/DC
Converter A
VIN
Vout
ON/OFF
DC/DC
Converter F
VIN
Vout
ON/OFF
12V
3.3V
2.5VIN
µP/
DSP/
NPU/
FPGA
1.2VIN
VM_F
HEALTHY
RESET
DONE
Figure 1 – Applications Schematic using the SMS66 Controller to cascade sequence up to six DC/DC
Converters while also providing supervisory functions.
Note: This is an applications example only. Some pins, components and values are not shown.
© SUMMIT Microelectronics, Inc. 2003 • 300 Orchard City Drive, #131 • Campbell CA 95006 • Phone [phone] • FAX [phone]
2070 1.0 7/16/03
www.summitmicro.com
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