SMM153

Preliminary Information

© SUMMIT Microelectronics, Inc. 2007 • 757 N. Mary Avenue • Sunnyvale CA 94085 • Phone 408 523-1000 • FAX 408 523-1266

http://www.summitmicro.com/

2134 2.0 8/12/2008

1

10-bit Digital Differential Voltage and Current Monitor

INTRODUCTION

• Real-time power monitoring for “Green” systems

• Differential Voltage Sensing of the DC-DC converter

output voltage

• Supply-side current monitoring (10-bit ADC)

• Two programmable general purpose sensor inputs

(COMP1/2) – UV/OV with FAULT Output

• Programmable glitch filters (COMP1/2)

• Programmable internal COMP1/2 VREF: 0.5V or 1.25V

• Operates from 2.7V to 5.5V supply

• Current sensing from 4.0V to 15V supply

• Programmable general-purpose inputs/outputs

• General-purpose 256-Byte EEPROM with Write Protect

monitoring status

Applications

•

In-system test and control of Point-of-Load (POL)

•

Power Supplies for Multi-voltage Processors, DSPs

and ASICs

•

Routers, Servers, Storage Area Networks

The SMM153 is a highly accurate power supply

voltage/current supervisor and monitor that allows real-

time power measurement for power-critical designs. The

part includes an internal voltage reference to accurately

monitor the supply to within ±1%. The SMM153 can read

the differential voltage of the supply and voltage drop of

the current sense resistor over the I

chip 10-bit ADC.

Two general purpose analog input pins are provided for

sensing

under-

or

over-voltage

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.

The

SMM153

also

provides

four

programmable general-purpose inputs/outputs.

Using the I

with the SMM153 status register and utilize 256-bytes of

nonvolatile memory. The SMM153 operates from +2.7V

to +5.5V, however it can sense input current from an

input supply of +4.0V to +15V. The device is offered in

both commercial and industrial temperature ranges and

the package is a space-saving 5x5 QFN-32 one.

TYPICAL APPLICATION

FEATURES & APPLICATIONS

VM+

VOUT+

SEN+

DC-DC Converter

VDD

COMP1

COMP2

CAPM+

V1

2.7V-5.5V

SMM153

GND

VDD_CAP

VOUT-

SEN-

VM-

12VIN

VIN

CS-

CS+

R

S

VREF

CAPM-

CAPC

WP

A0-A2

SCL

SDA

FAULT#

Interface

Status

Output

GPIO0

GPIO1

GPIO2

GPIO3

Figure 1 – Application with the SMM153 used to Monitor a DC/DC Converter.

Note: This is an applications example only. Some components and values are not shown.