SMM151_10 SUMMIT [Summit Microelectronics, Inc.], SMM151_10 Datasheet

SMM151_10

Manufacturer Part Number

SMM151_10

Description

Single-channel Voltage/Current Monitors and Voltage Marginers

Manufacturer

SUMMIT [Summit Microelectronics, Inc.]

Datasheet

1.SMM151_10.pdf (24 pages)

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Single-channel Voltage/Current Monitors and Voltage Marginers

• Capable of margining supplies with trim inputs using

• Wide Margin range of 0.3V to VDD with internal

• Differential Voltage Sensing of the DC-DC converter

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

• 10-bit ADC readout of supply voltage over I

• Margining Controlled Via:

• 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 I/Os (SMM152)

• General Purpose 256-Byte EEPROM with Write Protect

• I

• 28-lead 5x5 QFN

Applications

•

TYPICAL APPLICATION

FEATURES & APPLICATIONS

Figure 1 – Application with the SMM151/152 used to Monitor and Margin a DC/DC Converter.

Notes: R

not shown.

either positive or negative trim pin control

reference

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 are

Input Pins (M

C Command

2.7V-5.5V

Commands

Interface

4.0V-15V

Outputs

Margin

Status

, M

(GPIO0)

(GPIO1)

(GPIO2)

(GPIO3)

)

FAULT#

READY

A0-A2

SDA

SCL

MUP

MDN

CS+

CS-

CAPC

http://www.summitmicro.com/

C bus

(SMM152)

SMM151

VDD

2131 3.0 1/20/2010

GND

VDD_CAP

The

voltage/current supervisors and monitors with provisions for

voltage margining of the monitored supply. The parts include

an internal voltage reference to accurately monitor and margin

the supply to within ±1%. The SMM151/152 have the capability

to margin over a wide range from 0.3V to VDD using the

internal reference and can read the differential voltage of the

supply and voltage drop of the current sense resistor over the

using the I

programmed

SMM151/152 hold the converter at this voltage until receiving

an I

the SMM151/152 are 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 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

programmable general-purpose inputs/outputs.

Using the I

the SMM151/152 status register and utilize 256-bytes of

nonvolatile memory.

C bus using an on-chip 10-bit ADC. The margin levels are set

C bus or by using the M

INTRODUCTION

COMP2

VM+

COMP1

TRIM

CAPM+

CAPM-

VM-

VREF

C command or de-asserting the margin input pin. When

SMM151/152

exceeded.

C serial bus. The devices initiate margining via the

C interface, a host system can communicate with

margin

TRIM

DC-DC Converter

are

The

VIN

target

highly

VOUT+

VOUT-

SEN+

SEN-

SMM152

or M

voltage

SMM151/152

accurate

inputs. Once the pre-

also

power

provides

reached,

supply

four

the

Related parts for SMM151_10

SMM151_10 Summary of contents

Page 1

Single-channel Voltage/Current Monitors and Voltage Marginers FEATURES & APPLICATIONS • Capable of margining supplies with trim inputs using either positive or negative trim pin control • Wide Margin range of 0.3V to VDD with internal reference • Differential Voltage Sensing ...

Page 2

GENERAL DESCRIPTION The SMM151 and SMM152 are capable of margining the DC output voltage of LDOs or DC/DC converters that use a trim/adjust pin. The programmable over a standard 2-wire I interface and is used to set the margin low/high ...

Page 3

INTERNAL BLOCK DIAGRAM VDD VDD_CAP GND 50kΩ MUP MDN 50kΩ SCL SDA WP GPIO0 Control GPIO1 GPIO2 GPIO3 SMM152 Figure 2 – SMM151 and SMM152 Controller Internal Block Diagram. Summit Microelectronics, Inc VREF READY FAULT# VREF Output ...

Page 4

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

Page 5

PIN DESCRIPTIONS (CONTINUED) 5 I/O READY 29 GND GND PIN CONFIGURATION 28-Pad 5x5 QFN Top View () applies on SMM152 Summit Microelectronics, Inc Programmable active high/low open drain output indicates that VM its set point. When ...

Page 6

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 7

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 Address Input Tristate I AIT Maximum Leakage ...

Page 8

AC OPERATING CHARACTERISTICS T = 0°C to +70°C, VDD = 2.7V to 5.5V unless otherwise noted. All voltages are relative to GND. A Symbol Parameter Monitor sampling/conversion period t ADC_DAC Margin single bit increment or t MARG_I/D decrement time t ...

Page 9

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. Note 6. Symbol Description ...

Page 10

APPLICATIONS INFORMATION DEVICE OPERATION POWER SUPPLY The SMM151 and SMM152 can be powered by a 2.7V to 5.5V input to the VDD pin (Figure 1). See Figure example. VOLTAGE REFERENCE The SMM151/152 use an internal voltage reference, ...

Page 11

APPLICATIONS INFORMATION (CONTINUED) NO Summit Microelectronics, Inc MARGINING OPERATION POWER OK? YES INPUT VTRIM TO ADC DUMP ADC INTO DAC DAC DRIVES BRICK (TRIM OUTPUT LO-Z) INPUT VOUT TO ADC ADC EQUAL TARGET? NO YES 1. HOLD DAC 2. CLEAR ...

Page 12

APPLICATIONS INFORMATION (CONTINUED) When measuring the margin delay time external to the device, ADC sample time and Update Trim time (≅ 3.6 ms) must be added to the internally programmed delay time as shown: Spec Actual measurement 2.5 ms 6.1 ...

Page 13

APPLICATIONS INFORMATION (CONTINUED) FAULTS When either of the COMP1 or COMP2 inputs are in fault, the open-drain FAULT# output will be pulled low. A configuration option exists to disable the FAULT# output while the device is margining. If “Fault Output ...

Page 14

APPLICATIONS INFORMATION (CONTINUED) +VIN 2.7V- 5.5V MUP MDN VDD VDD C1 0.01uF Programming Supply DIODE Gnd SCL 3 4 Gnd3 SDA 5 6 Rsrv5 +10V Rsrv8 9 10 +5V Rsrv10 I2C Figure 6 ...

Page 15

APPLICATIONS INFORMATION (CONTINUED) Maximizing Accuracy Maximum margining accuracy is obtained by placing a resistor between the SMM151/152 TRIM output and the TRIM input of the converter. From the manufacturer’s data sheet obtain the value of the internal voltage reference and ...

Page 16

APPLICATIONS INFORMATION (CONTINUED TRIM SMM151/152 TRIM Pin R2 Figure 8 - Simplified TRIM circuit of a non-isolated DC-DC converter connects to SMM151/152 TRIM output Summit Microelectronics, Inc VOUT To FB node (VREF) 2131 3.0 1/20/2010 16 SMM151/152 ...

Page 17

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 18

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 19

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 11, 12 and 13. Note: Configuration writes or reads of ...

Page 20

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

Page 21

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

Page 22

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

Page 23

PACKAGE OUTLINES Summit Microelectronics, Inc 28-Pad QFN 2131 3.0 1/20/2010 23 SMM151/152 ...

Page 24

PART MARKING Subject to Change ORDERING INFORMATION Summit SMM151 Part Number SMM151 or SMM152 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 ...

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