SMM153_10 SUMMIT [Summit Microelectronics, Inc.], SMM153_10 Datasheet

SMM153_10

Manufacturer Part Number

SMM153_10

Description

10-bit Digital Differential Voltage and Current Monitor

Manufacturer

SUMMIT [Summit Microelectronics, Inc.]

Datasheet

1.SMM153_10.pdf (18 pages)

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10-bit Digital Differential Voltage and Current Monitor

• Real-time power monitoring for “Green” systems

• Differential Voltage Sensing of the DC-DC converter

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

• 10-bit ADC readout of supply voltage over I

• Two programmable general purpose sensor inputs

• 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

• I

•

Applications

•

TYPICAL APPLICATION

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

Notes: R

are not shown.

FEATURES & APPLICATIONS

28-lead 5x5 QFN package

output voltage

(COMP1/2) – UV/OV with FAULT Output

monitoring status

C 2-wire serial bus for programming configuration and

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

Power Supplies for Multi-voltage Processors, DSPs

and ASICs

Routers, Servers, Storage Area Networks

must be Kelvin sensed for maximum current sensing accuracy. This is an applications example only. Some components and values

2.7V-5.5V

Interface

12VIN

Output

Status

GPIO0

GPIO1

GPIO2

GPIO3

FAULT#

A0-A2

SDA

SCL

CS+

CS-

CAPC

http://www.summitmicro.com/

C bus

SMM153

VDD

2134 3.0 1/20/2010

GND

VDD_CAP

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

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.

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-28 one.

INTRODUCTION

COMP1

COMP2

CAPM-

VM+

CAPM+

VM-

VREF

under-

C interface, a host system can communicate

The

DC-DC Converter

VIN

SMM153

VOUT+

VOUT-

over-voltage

SEN+

SEN-

also

C bus using an on-

SMM153

provides

conditions.

four

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SMM153_10 Summary of contents

Page 1

Digital Differential Voltage and Current Monitor FEATURES & APPLICATIONS • Real-time power monitoring for “Green” systems • Differential Voltage Sensing of the DC-DC converter output voltage • Supply-side current monitoring (10-bit ADC) • 10-bit ADC readout of supply voltage ...

Page 2

GENERAL DESCRIPTION The SMM153 is a highly accurate power supply voltage/current supervisor and monitor that allows real- time power measurement for power-critical designs. This advance functionality allows the development of “Green” systems and introduces higher levels of system reliability. The ...

Page 3

INTERNAL BLOCK DIAGRAM VDD VDD_CAP GND 50kΩ SCL Interface SDA WP GPIO0 Control GPIO1 GPIO2 GPIO3 Figure 2 – SMM153 Controller Internal Block Diagram. PACKAGE AND PIN CONFIGURATION 28-Pad 5x5 QFN Top View Summit Microelectronics, Inc VREF ...

Page 4

PIN DESCRIPTION Pin Pin Pin Name Number Type 28 I/O SDA 1 I SCL 22, 27 I/O GPIO0,1,2 10, 13 CAP CAPM VM+ ...

Page 5

ABSOLUTE MAXIMUM RATINGS Temperature Under Bias .................................-55°C to 125°C Storage Temperature QFN ..............................-65°C to 150°C Terminal Voltage with Respect to GND: VDD Supply Voltage .................................. -0.3V to 6.0V All Others ....................................... -0. 0.7V FAULT#…………………………….………. GND to ...

Page 6

DC OPERATING CHARACTERISTICS (CONTINUED 0°C to +70°C, VDD = 2.7V to 5.5V, VCS = 4.0V to 15V, unless otherwise noted. All voltages are relative to GND. A Note 6. Symbol Parameter V COMP1/2 DC Hysteresis HYST R Input ...

Page 7

I C 2-WIRE SERIAL INTERFACE AC OPERATING CHARACTERISTICS – 100kHz T = 0°C to +70°C, VDD = 2.7V to 5.5V unless otherwise noted. All voltages are relative to GND. See Figure 3 Timing A Diagram. Symbol Description f SCL ...

Page 8

APPLICATIONS INFORMATION DEVICE OPERATION POWER SUPPLY The SMM153 can be powered by a 2.7V to 5.5V input to the VDD pin (Figure 1). See Figure example. VOLTAGE REFERENCE The SMM153 uses an internal voltage reference, VREF of ...

Page 9

APPLICATIONS INFORMATION (CONTINUED) CS+, CS- Select a resistor value that will drop no more than 100mV (full scale) when full load is drawn by the converter or circuit being sensed by the resistor R (Figure 1). To obtain highest accuracy ...

Page 10

APPLICATIONS INFORMATION (CONTINUED) Figure 4 – Typical application schematic shows the SMM153 controlling a VIN=12V, VOUT=1.5V, DC/DC converter. This example, using the 1.25V VREF, also shows the COMP1/2 pins monitoring the DC/DC converter VOUT set 1.7V ...

Page 11

APPLICATIONS INFORMATION (CONTINUED) The end user can obtain the Summit SMX3202 programming system for device prototype development. The SMX3202 system consists of a programming TM Dongle, cable and Windows GUI software. It can be ordered on the website or from ...

Page 12

I C PROGRAMMING INFORMATION SERIAL INTERFACE Access to the configuration registers, general-purpose memory and command and status registers is carried out over an industry standard 2-wire serial interface 2 (I C). SDA is a bi-directional data line and SCL ...

Page 13

I C PROGRAMMING INFORMATION (CONTINUED) CONFIGURATION REGISTERS The majority of the configuration registers are grouped with the general-purpose memory. Writing and reading the configuration registers is shown in Figures 7, 8 and 9. Note: Configuration writes or reads of ...

Page 14

I C PROGRAMMING INFORMATION (CONTINUED Master Slave Master Slave Master ...

Page 15

I C PROGRAMMING INFORMATION (CONTINUED Master Slave Master Data ( Slave Master ...

Page 16

I C PROGRAMMING INFORMATION (CONTINUED Master Slave Master Data ( Slave Master T ...

Page 17

PACKAGE OUTLINES Summit Microelectronics, Inc 28-Pad QFN 2134 3.0 1/20/2010 17 SMM153 ...

Page 18

PART MARKING Subject to Change Pin 1 ORDERING INFORMATION Summit SMM153 N Part Number Package N=28-Pad QFN NOTE 1 - This is a final data sheet that describes a Summit product currently in production. SUMMIT Microelectronics, Inc. reserves the right ...

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