SMM153 データシートの表示（PDF） - Summit Microelectronics

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SMM153

10-bit Digital Differential Voltage and Current Monitor

Summit Microelectronics 

SMM153

GENERAL DESCRIPTION

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

Kelvin-connected sense resistor 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 I2C 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 is determined via NV 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.

Summit Microelectronics, Inc

2134 3.0 1/20/2010

2

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