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SMM766
Preliminary Information 1 (See Last Page)
Six-Channel Active DC Output Controller, Monitor, Marginer and Sequencer with Sequence-Link
FEATURES & APPLICATIONS
Extremely accurate (±0.2%) Active
DC Output Control (ADOC™)
Sequence-Link™ provides sequencing of up to
48 channels
ADOC automatically adjusts supply output
voltage level under all DC load conditions
Monitors, controls, and margins up to 6
supplies from 0.3V to 5.5V with 1.25V Vref
www.DataSheetP4Uro.cgomrammable power-on/-off sequencing
Operates from any intermediate bus supply
from 6V to 14V and from 2.7V to 5.5V
Monitors 12V input VDD and temperature sensor
Wide margin/ADOC range from 0.3V to VDD
Monitors two general-purpose 10-bit ADC inputs
I2C 2-wire serial bus for programming
configuration and monitoring status, including
10-bit ADC conversion results
2 programmable Under Voltage (UV) and Over
Voltage (OV) threshold limits for each of 11
monitored inputs
2k-bit general purpose nonvolatile memory
Applications
Monitor/control distributed and POL supplies
Multi-voltage processors, DSPs, ASICSs used in
telecom, CompactPCI or server systems
INTRODUCTION
The SMM766 is an Active DC Output power supply
Controller (ADOCTM) that monitors, margins, and
cascade sequences. The ADOC feature is unique and
maintains extremely accurate settings of system
supply voltages to within ±0.2% under full load. The
SMM766 actively controls up to 6 DC/DC converters
and can be linked with up to 7 other Sequence-Link™
devices to accommodate sequencing of up to 48
channels. Control of the DC-DC converters is
accomplished through the use of a Trim or Regulator
VADJ/FB pin to adjust the output voltage. For system
test, the part also controls margining of the supplies
using I2C commands. It can margin supplies with
either positive or negative control within a range of
0.3V to VDD, depending on the specified range of the
converter. The SMM766 also intelligently sequences
or cascades the power supplies on and off in any
order using enable outputs with programmable
polarity. It can operate off any intermediate bus supply
ranging from 6V to 14V or from 5.5V to as low as 2.7V.
The part monitors 6 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 monitor channels and output the data via
the I2C bus. A host system can communicate with the
SMM766 status register, margining and utilize 2K-bits
of nonvolatile memory.
SIMPLIFIED APPLICATIONS DRAWING
12VIN (+6V to +14V Range)
3.3VIN (+2.7V to +5.5V Range)
I2C
BUS
External
or
Internal
TEMP
SENSOR
SDA
CAPA
TRIM_CAPA
SCL
A2 TRIMA
SEQ_LINK
PUPA
2 of 6 DC-DC
SMM766
Converters shown
VMA
AIN1
CAPB
TRIM_CAPB
Environmental
SENSOR
External or
Internal
REFERENCE
AIN2
VREF
TRIMB
PUPB
VMB
DC/DC
Converter C, E
VIN
DC/DC
Converter A
Vout
TRIM
ON/OFF
DC/DC
Converter D, F
VIN
DC/DC
Converter B
Vout
TRIM
ON/OFF
12V
3.3V
2.5VIN
µP/
ASIC
1.2VIN
HEALTHY
RESET#
READY
Figure 1 – Applications schematic using the SMM766 controller to actively control the output levels of up
to 6 DC/DC converters while also providing power-on/off, cascade sequencing and output margining.
Note: This is an applications example only. Some pins, components and values are not shown.
© SUMMIT Microelectronics, Inc. 2004 • 1717 Fox Drive • San Jose CA 95131 • Phone 408 436-9890 • FAX 408 436-9897
The Summit Web Site can be accessed by “right” or “left” mouse clicking on the link: http://www.summitmicro.com/
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TABLE OF CONTENTS
General Description………………………...……………3
Internal Functional Block Diagram……..… ……………4
Pin Descriptions………………………………………..5-6
Package And Pin Configuration………………… ……..7
Absolute Maximum Ratings………………… ………….8
Recommended Operating Conditions……… …..……..8
DC Operating Characteristics………………….. …..8-10
AC Operating Characteristics………………...……….10
I2C 2-Wire Serial Interface AC Operating
www.DataShCeeht4aUra.ccotmeristics-100/400khz……………………………11
Timing Diagrams……………………… ……………11-12
DEVICE OPERATION
Power
Supply………………………………….……….…… ….14
Modes Of Operation………………………...………….14
Active DC Output Control……………………… ….14-15
Power-On Cascade Sequencing….……………….….15
Ongoing Operations-Monitoring Mode…………...…..16
Temperature Sensor Accuracy………………………..16
Margining…………………………………………… …..17
Power-Off Cascade Sequencing………………….…..17
Force-Shutdown….………………………………… ….17
Linked Operation……………………………..…...… …18
Restart…..………………………………………….… …18
I2C Power-Off Control………………………...………..18
SMM766
Preliminary Information
Recommended Use Of The Power On Pin……… ….19
Applications Schematic…………………………… …..20
Development Hardware & Software……………...…..21
I2C Programming Information
Serial Interface.……………………………………..…..22
Write……………………………………...….…… ……..22
Read….…………………………………………… …….22
Write Protection….……………………….………… ….23
Configuration Registers…..………………………… …23
General-Purpose Memory….………………………….23
Command And Status Registers……………………...23
ADC Conversions….………………………….…….….23
Graphical User Interface (GUI)………………………..23
Write Protection Register Write……………...………..24
Configuration Register Read/Write………...……..24-25
General-Purpose Memory Read/Write……..…… …..26
Command And Status Register Read/Write…… …...27
ADC Conversion Read….……………………… ….….27
Default Configuration Register Settings……….……..28
Package…………………………………………..… …..29
Part Marking……………………………………...……..30
Ordering Information…..……………………….… ……30
Terminology And Definitions…………………………..31
Legal Notice……………………………………………..32
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SEQUENCE POSITION
VDD (+2.7V to +5.5V)
or 12VIN ( +8V to +15V)
2.7V
2.5V
2.0V
1.8V
1.5V
1.2V
12
34
5
SMM766
Preliminary Information
www.DataSheFeti4gUu.croem2 – Example power supply sequencing and system start-up initialization using the SMM766. Cascade
sequencing ensures that all supplies in the previous sequence position are valid before the next channel is
released. Using the SMM766 any order of supply sequencing can be applied.
GENERAL DESCRIPTION
The SMM766 is a highly integrated and accurate
power supply controller, monitor, and sequencer. Each
device has the ability to automatically control, monitor
and cascade sequence up to 6 power supplies. In
addition, the SMM766 includes Sequence-Linka
feature that allows for the seamless integration of
other Sequence-Link devices to accommodate
sequencing of up to 48 channels. The SMM766 can
monitor the VDD input, the 12V input, two general-
purpose analog inputs, and the internal temperature
sensor. The SMM766 has four operating modes:
power-on sequencing mode, monitor mode, supply
margining mode using Active DC Output Control
(ADOCTM), and power-off sequencing mode.
Power-on sequencing is initiated by the rising edge of
the PWR_ON pin. During power-on sequencing the
SMM766 will sequence the power supply channels on,
in any order, by activating the PUP outputs and
monitoring the respective converter voltages to ensure
cascading of the supplies. Cascade sequencing is the
ability to hold off the next sequenced supply until the
first supply reaches a programmed threshold. A
programmable sequence termination timer can be set
to disable all channels if the power-on sequence stalls.
Once all supplies have sequenced on and the voltages
are above the UV settings, the ADOC, if enabled, will
bring the supply voltages to their nominal settings.
During this mode, the HEALTHY output will remain
inactive and the RST# output will remain active.
Once the power-on sequencing mode is complete, the
SMM766 enters monitor mode. In the monitor mode,
the SMM766 starts the ADOC control of the supplies
and adjusts the output voltage to the programmed
setting under all load conditions, especially useful for
supplies without sense lines. Typical converters have
±2% accuracy ratings for their output voltage; the
ADOC feature of the SMM766 increases the accuracy
to ±0.2% (using a ±0.1% external voltage reference).
The part also enables the triggering of outputs by
monitored fault conditions. The 10-bit ADC cycles
through all 11 channels every 2ms and checks the
conversions against the programmed threshold limits.
The results can be used to trigger RST#, HEALTHY
and FAULT# outputs as well as to initiate a Fault-
Triggered power-off or force-shutdown operation.
While the SMM766 is in its monitoring mode, an I2C
command to margin the supply voltages can bring the
part into margining mode. In margining mode the
SMM766 can margin 6 supply voltages in any
combination of nominal, high and low voltage settings
using the ADOC feature, all to within ±0.2% using a
±0.1% external reference. The margin high and low
voltage settings can range from 0.3V to VDD around
the converters’ nominal output voltage setting
depending on the specified margin range of the DC-
DC converter. During this mode the HEALTHY output
is always active and the RST# output is always
inactive regardless of the voltage threshold limit
settings and triggers. Furthermore, the triggers for
power-off and force-shutdown are temporarily
disabled.
The power-off sequencing mode can only be entered
while the SMM766 is in the monitoring mode. It can
be initiated by either bringing the PWR_ON pin low,
through I2C control, or triggered by a channel
exceeding its programmed thresholds. Once power-
off is initiated, it will disable the ADOC function and
sequence the PUP outputs off in the reverse order as
power-on sequencing. To ensure cascading of the
supplies during power-off sequencing all supplies will
be monitored as they turn off. The sequence
termination timer performs a forced-shutdown
operation if power-off sequencing stalls.
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INTERNAL FUNCTIONAL BLOCK DIAGRAM
12VIN VDD
VDD_CAP
PWR_ON FS#
SMM766
Preliminary Information
www.DataSheet4U.com
AIN1
AIN2
VMA
CAPA
VMF
CAPF
TRIMA
TRIM_CAPA
TRIMF
TRIM_CAPF
VREF
FILT_CAP
3.6V or
5.5V
Regulator
Power
Supply
Arbitrator
10-Bit ADC
Temperature
Sensor
UVLO
Control
Cascade
Sequence
Control
Output
Control
Active DC
Output
Control
(ADOCTM)
Memory, Limit
and Status
Registers
I2C
Interface
Figure 3 – SMM766 Internal Functional Block Diagram.
SEQ_LINK
PUPA
PUPB
PUPC
PUPD
PUPE
PUPF
MR#
RST#
HEALTHY
FAULT#
SDA
SCL
A2
GND
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PIN DESCRIPTIONS
Pin Pin
Number Type
Pin Name
1 DATA SDA
2 CLK SCL
www.DataShe3et4U.com IN
A2
4 IN MR#
5 I/O PWR_ON
6 I/O FS#
7 OUT FAULT#
8 OUT HEALTHY
9 OUT RST#
10 IN AIN1
11 IN AIN2
12 GND GND
SMM766
Preliminary Information
Pin Description
SDA (Serial Data) is an open drain bi-directional pin used as the I2C data
line.
SCL (Serial Clock) is an open drain input pin used as the I2C Clock line.
The A2 (Address bit 2) pin is biased either to VDD_CAP or GND. When
communicating with the SMM766 over the 2-wire I2C bus, A2 provides a
mechanism for assigning a unique bus address.
MR# (Manual Reset) is an active low input. When asserted the RST# output
will become active. When de-asserted the RST# output will go inactive
immediately after a reset timeout period (tRTO) if there are no RST# trigger
sources active. This timeout period makes it suitable to use as a pushbutton
for manual reset purposes.
PWR_ON (Power On) is an open drain bi-directional pin. On the rising edge
of PWR_ON the part will sequence the supplies on, during the falling edge
the part will sequence the supplies off. This pin must be tied high through an
external pull-up resistor.
Note: The SMM766 does not monitor for faults during power-on/off
sequencing.
FS# (Force Shutdown) is an open drain active low bi-directional pin. FS# is
used to immediately turn off all converter enable signals (PUP outputs) when
a fault is detected. Whenever FS# is asserted PWR_ON will automatically be
pulled low as well. This pin must be tied high through an external pull-up
resistor.
The FAULT# pin is an active low open drain output. Active when a
programmed fault condition exists on AIN1, AIN2, or the internal temperature
sensor. When used, FAULT# should be pulled high through an external pull-
up resister.
HEALTHY is an active high open drain output. Active when all programmed
power supply inputs and monitored inputs are within OV and UV limits and
ADOC has begun. When used, HEALTHY should be pulled high through an
external pull-up resistor.
RST# (Reset) is an active low open drain output pin. Active when a
programmed fault condition exists on any power supply inputs or monitored
inputs, when MR# is active, or when ADOC is not ready. RST# has a
programmable timeout period with options for 0.64ms, 25ms, 100ms and
200ms. When used, RST# should be pulled high through an external pull-up
resistor.
AIN1 (Analog Input 1) is a general-purpose monitored analog input.
AIN2 (Analog Input 2) is a general-purpose monitored analog input.
Ground.
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