SMM153 datasheet(2/17 Pages) SUMMIT

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SMM153

Preliminary Information

Summit Microelectronics, Inc

2.0 8/12/2008

The SMM153 is a highly accurate power supply

voltage/current supervisor and monitor that allows real-

time power measurement for power-critical designs. This

advance functionality allows the development of “Green”

systems and introduces higher levels of system

reliability.

The SMM153 senses converter input current using a

sense resistor connected in series with the converter

supply whose terminals are connected to the CS+ and

CS- pins. The internal ADC, also used for measuring the

converter’s output voltage, is used to measure the

converter’s input current using the voltage dropped

across the current sense resistor RS (see Figure 1).

The SMM153 has two additional input pins and one

additional output pin. The input pins, COMP1 and

COMP2, are high impedance inputs, each connected to

a comparator and compared against the internal

reference.

Each comparator can be independently

programmed to monitor for under- or over-voltage

conditions.

When either of the COMP1 or COMP2

inputs are in fault the open-drain FAULT# output will be

pulled low.

The SMM153 also provides real-time, differential voltage

measurement of the converter output voltage. The

differential sensing of the VM+ and VM- inputs

eliminates the ground or low-side error sometimes

encountered with a single-ended sensing schemes

Programming of the SMM153 is performed over the

industry standard I

2C 2-wire serial data interface. A

status register is available to read the state of the part

and a Write Protect (WP) pin is available to prevent

writing to the configuration registers and EE memory.

The SMM153 also provides four programmable general-

purpose inputs/outputs. The power-on state of these

I/Os

determined

via

memory.

Volatile

programming allows the user to select the logic level

(HIGH or LOW) of each I/O, which can also be read via

a status register.

GENERAL DESCRIPTION

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