SMT4214
Expandable Four-Rail Tracking Manager
FEATURES & APPLICATIONS
•
Programmable Tracking Function
•
Programmable Voltage Monitoring of 4 or more
Independent Supplies
•
Programmable Under-Voltage Thresholds
•
Provides Soft Start, Reset, IRQ and Force
Shutdown functions
•
Minimizes Supply Differential During Power-on
and Power-off
•
Operates From Any One of Four Supply
Voltages
•
Easily Expandable to Control up to 32 Supplies
•
Packaged in a 28 Lead SSOP
Applications
•
Multi-voltage supply rail manager for
•
Telecom Infrastructure
•
Compact PCI
•
Servers
•
Multi-voltage Network Processors, DSPs,
ASICs
Preliminary Information
1
(See Last Page)
INTRODUCTION
The SMT4214 is a fully integrated programmable
voltage manager IC, providing supervisory functions
and tracking control for up to four independent power
supplies. The four internal managers perform the
following functions: Monitor source (bus-side) voltages
for under-voltage conditions, monitor back end (card-
side) voltages for under-voltage conditions, insure
voltage of the card-side tracks within the specified
parametric limits, and provides supply status
information to a host processor.
The
SMT4214
incorporates
nonvolatile
programmable circuits for setting all of the monitored
thresholds for each manager. Individual functions are
also programmable allowing interrupts or reset
conditions to be generated by user-defined
combinations of events.
Programming of configuration and control values
by the user can be simplified with the interface adapter
(SMX3200) and Windows GUI software obtainable
from Summit Microelectronics.
SIMPLIFIED APPLICATIONS DRAWING
+5.0V
+3.3V
+2.7V
+2.5V
MR#
SCL
SDA
VGAT E
A
VGAT E
B
VGAT E
A
VGAT E
C
SDA
VI
B
VO
B
MR#
SCL
VO
A
VO
C
VI
A
VI
C
VO
A
VI
A
+5.0V
+3.3V
+2.7V
+2.5V
5.0V
3.3V
2.7V
2.5V
1.8V
VRLINK
LINK#
FS#
VRLINK
LINK#
FS#
SMT4214
Slaves
RST#
PW R_ON#
SEAT ED#
VI
D
SMT4214 - Master
VGAT E
D
AP
P
A
PWR_ON#
RST #
_C
_C
VO
D
VD
VG
Early GND
IRQ#
RST# Slave
IRQ_CLR#
D
G
IRQ_CLR#
IRQ#
Short Pin GND
Note 1
RST# M aster
RST# Master
RST# Slave
---
t1
---
---
t2
---
+1.8V
+1.8V
Power supply and system start-up initialization using multiple SMT4214s. Two power supply
channels are set to ‘softstart’ and three are set to track.
The above drawing illustrates the use of the SMT4214 in a multi-device application. It should be noted this is just an example and the specific component
values are purposely not shown. Note 1 - Several pins have internal resistors so external resistors are optional (see the Internal Functional Block
Diagram). If external resistors are used they should be tied to VDD_CAP on the Master.
© 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/
2061 2.2 09/15/05
1
SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
