SMM151/152
Single-channel Voltage/Current Monitors and Voltage Marginers
FEATURES & APPLICATIONS
INTRODUCTION
The SMM151/152 are highly accurate power supply
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
I2C bus using an on-chip 10-bit ADC. The margin levels are set
using the I2C serial bus. The devices initiate margining via the
I2C bus or by using the MUP or MDN inputs. Once the pre-
programmed margin target voltage is reached, the
SMM151/152 hold the converter at this voltage until receiving
an I2C command or de-asserting the margin input pin. When
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.
• 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 of the DC-DC converter
output voltage
• Supply-side current monitoring (10-bit ADC)
• 10-bit ADC readout of supply voltage over I2C bus
• Margining Controlled Via:
ꢀ
I2C Command
ꢀ
Input Pins (MUP, MDN
)
• Two programmable general purpose sensor inputs
(COMP1/2) – UV/OV with FAULT Output
• 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
• I2C 2-wire serial bus for programming configuration and
monitoring status
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 is exceeded. The SMM152 also provides four
programmable general-purpose inputs/outputs.
Using the I2C interface, a host system can communicate with
the SMM151/152 status register and utilize 256-bytes of
nonvolatile memory.
• 28-lead 5x5 QFN
Applications
•
•
In-system test and control of Point-of-Load (POL)
Power Supplies for Multi-voltage Processors, DSPs
and ASICs
•
Routers, Servers, Storage Area Networks
TYPICAL APPLICATION
4.0V-15V
RS
2.7V-5.5V
CAPC
CS-
CS+
MUP
VDD
GND
VDD_CAP
COMP1
V1
COMP2
VREF
Margin
Commands
MDN
VIN
FAULT#
READY
Status
Outputs
VOUT+
SEN+
SMM151
(SMM152)
SDA
SCL
TRIM
I2C
TRIM
VOUT-
SEN-
Interface
A0-A2
WP
CAPM+
DC-DC Converter
(GPIO0)
(GPIO1)
CAPM-
VM+
VM-
(GPIO2)
(GPIO3)
Figure 1 – Application with the SMM151/152 used to Monitor and Margin a DC/DC Converter.
Notes: RS must be Kelvin sensed for maximum current sensing accuracy.This is an applications example only. Some components and values are
not shown.
© SUMMIT Microelectronics, Inc. 2007 • 757 N. Mary Avenue • Sunnyvale CA 94085 • Phone 408 523-1000 • FAX 408 523-1266
http://www.summitmicro.com/
2131 3.0 1/20/2010
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