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Part: SMS66F
Category:
Power Management
-> Supervisory Circuits
-> Sequencers Supervisory
Description: Six-channel Power Supply Supervisor And Cacsade Sequence Controller
Company: Summit Microelectronics, Inc.
Datasheet: Download SMS66F datasheet File size : 516 kB
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Datasheet text preview:
SMS66
Six-Channel Power Supply Supervisor and Cacsade Sequence Controller
FEATURES & APPLICATIONS
· · · · · · · · Very accurate monitor function 5mV steps Monitors and sequences up to six supplies Programmable Power-on/-off sequencing Monitors internal temperature sensor Operates from 12V or 3.3V supply Monitors 12V input and VDD Monitors two general-purpose 10-bit ADC inputs Programmable threshold limits (2 OV/2 UV) for each monitored input · Programmable RESET, HEALTHY and FAULT functions · 4k-bit general purpose nonvolatile memory · I2C 2-wire serial bus for programming configuration and monitoring status, including 10-bit ADC conversion results Applications · Monitor and Sequence Distributed Power and Point of Load Power Supplies · Multi-voltage Processors, DSPs, ASICs used in Telecom, CompactPCI or server systems Preliminary Information1 (See Last Page)
INTRODUCTION
The SMS66 is a very accurate programmable power supply supervisor that monitors and sequences. It controls sequencing time and position of up to six isolated or non-isolated distributed or POL DC/DC converters. The monitor supervisory function has two independent UV and OV settings for each supply and can be set in 5mV steps. The SMS66 also sequences the power supplies in any order using enable outputs with programmable polarity. The SMS66 monitors six power supply channels as well as VDD, 12V input, two general-purpose analog inputs and an internal temperature sensor using a 10bit ADC. The 10-bit ADC can measure the value on any one of the input channels and output the conversion data via the I2C bus. Using the I2C interface, a host system can communicate with the SMS66 status register, optionally control Power-on/off, and utilize 4 K-bits of nonvolatile memory.
SIMPLIFIED APPLICATIONS DRAWING
12VIN (+8V to +15V Range) VDD (+2.7V to +5.5V Range) 12VIN VDD DC/DC Converter A VIN Vout 2.5VIN 12V 3.3V
SDA I2C BUS SCL A2 PUPA External or Internal T EM P SENSOR ON/OFF
AIN1
SMS66
VMA DC/DC Converter F VIN Vout
µ P/ DSP/ NPU/ FPGA
1.2VIN
External or Internal REFERENCE
VREF_OUT VREF_ADC HEALTHY PUPF ON/OFF
RST
MR
VMF HEALTHY RESET DO NE
Figure 1 Applications Schematic using the SMS66 Controller to cascade sequence up to six DC/DC Converters while also providing supervisory functions.
Note: This is an applications example only. Some pins, components and values are not shown. © SUMMIT Microelectronics, Inc. 2003 · 300 Orchard City Drive, #131 · Campbell CA 95006 · Phone 408 378-6461 · FAX 408 378-6596 2070 1.0 7/16/03
www.summitmicro.com
1
SMS66
Preliminary Information
VDD (+2.7V to +5.5V) or 12VIN ( +8V to +15V) 2. 7V 2.5V 2.0V 1. 8V 1. 5V
tDPONA
tDPONB RST# tDPONC
tDPOND
tDPONE
tDPONF tPRTO
Figure 2 Example Power Supply Sequencing and System Start-up Initialization using the SMS66. Any order of supply sequencing can be applied using the SMS66 with very accurate monitoring and supervisory functions.
GENERAL DESCRIPTION
The SMS66 is a highly integrated power supply controller, monitor and sequencer. It has the ability to control, monitor and sequence up to six power supplies. Also, the SMS66 can monitor the VDD input, the 12V input, two general-purpose analog inputs and the internal temperature sensor. The SMS66 has three operating modes: Power-on sequencing mode, monitor mode, and Power-off sequencing mode. Power-on sequencing can be initiated via the PWR_ON/OFF pin or I2C control. In this mode, the SMS66 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. A programmable sequence termination timer can be set to disable all channels if the Power-on sequence stalls. 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 SMS66 enters monitor mode. In the monitor mode the SMS66 supervises the supplies to within 5mV, and 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 trigger a Power-off or a Force Shutdown operation. The Power-off sequencing mode can only be entered while the SMS66 is in the monitoring mode. It can be initiated by either bringing the PWR_ON/OFF pin inactive, through I2C control or triggered by a channel exceeding its programmed thresholds. Once Poweroff is initiated it will disable the Active DC Control and sequence the PUP outputs off in either the same or reverse order as Power-on sequencing and monitor the supply voltages to ensure cascading of the supplies as they turn off. The sequence termination timer can be programmed to immediately disable all channels if the Power-off sequencing stalls. The RST output will remain active throughout this mode while the HEALTHY output remains inactive.
Summit Microelectronics, Inc
2070 1.0 7/16/03
2
SMS66
Preliminary Information
INTERNAL FUNCTIONAL BLOCK DIAGRAM
12V I N V DD VDD_CAP P W R _O N /O F F F S
VREF_ADC AIN1 AIN2 VM A CAPA
3.6V or 5 .5 V R e g u la to r
Pow er S up ply Arbitrator S eq ue nc e C o n tr o l
P UP A P UP B P UP C PUP D P UP E PUP F
10-Bit ADC
T e m p e r a tu r e Sensor
VM F MR CAPF RS T HEALTHY FAULT
O u tp u t C o n tr o l
V R E F _O U T
R e fe r e n c e
Memory and Limit Registers
I2 C Inte rfac e
S DA SCL A2 GND
Figure 3 SMS66 Internal Functional Block Diagram.
Summit Microelectronics, Inc
2070 1.0 7/16/03
3
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