SMM150
Preliminary Information 1 (See Last Page)
Single-Channel Supply Voltage Marginer/Monitor
FEATURES
INTRODUCTION
The SMM150 is a highly accurate power supply
voltage supervisor and environmental monitor with
provisions for voltage margining of the monitored supply.
The part includes an internal voltage reference to
accurately monitor and margin the supply to within ±1%.
The SMM150 has the capability to margin over a wide
range from 0.3V to VDD using the internal reference and
can read the value of the supply over the I2C bus using
an on-chip 10-bit ADC. The monitor and margin levels
are set using the I2C serial bus. The SMM150 initiates
margining via the I2C bus or by using the MUP or MDN
inputs. Once the pre-programmed margin target voltage
is reached, the SMM150 holds the converter at this
voltage until receiving an I2C command or de-asserting
the margin input pin. When the SMM150 is not
margining, the TRIM output pin is held in a high
impedance state allowing the converter to operate at its
nominal set point. Two general purpose input pins are
provided for sensing under or overvoltage conditions. A
programmable glitch filter associated with these inputs
allows the user to ignore spurious noise signals. A
FAULT# pin is asserted once either input set point is
exceeded.
• Capable of margining supplies with trim inputs
using either positive or negative trim pin control
• Wide Margin range from 0.3V to VDD using
internal reference
• 10-bit ADC readout of supply voltage over I2C bus
• Margining Controlled Via:
ꢀ
ꢀ
I2C Command
Input Pins (MUP, MDN)
• Two programmable general purpose sensor inputs
(COMP1/2) – UV/OV with FAULT Output
• Programmable glitch filter (COMP1/2)
• Programmable internal VREF, 0.5V or 1.25V
• Operates from 2.7V to 5.5V supply
• General Purpose 256-Byte EEPROM with Write
Protect
• I2C 2-wire serial bus for programming
configuration and monitoring status
• 28 lead QFN
• 20 ball Ultra CSPTM (Chip-Scale) package
Applications
• In-system test and control of Point-of-Load (POL)
Power Supplies for Multi-voltage Processors,
DSPs and ASICs
Using the I2C interface, a host system can communicate
with the SMM150 status register and utilize 256-bytes of
nonvolatile memory.
• Routers, Servers, Storage Area Networks
SIMPLIFIED APPLICATIONS DRAWING
2.7V-5.5V
VDD_CAP
VDD
GND
MUP
MDN
COMP1
V1
Margin
Commands
FAULT#
READY
Status
COMP2
Outputs
SMM150
VOUT+
SEN+
SDA
SCL
A0
TRIM
TRIM
I2C
CAPM
Interface
A1
A2
WP
DC-DC Converter
VM
Figure 1 – Applications using the SMM150 Controller to control the Voltage Margining of a DC/DC Converter.
Note: This is an applications example only. Some components and values are not shown.
© SUMMIT Microelectronics, Inc. 2005 • 1717 Fox Drive • San Jose CA 95131 • Phone 408 436-9890 • FAX 408 436-9897
www.summitmicro.com
1
2075 2.6 05/13/05
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