TPS2480PW datasheet(34/60 Pages) TI2

34 / 60 page

GND

BUS

IN-

Rangeof0Vto26V

TypicalApplication12V

Data(SDA)

3.3VSupply

Clock(SCL)

PowerRegister

CurrentRegister

I C

Interface

VoltageRegister

IN+

IN-

ADC

PGA

GND

Current

Shunt

SHUNT

IN+

IN-

Typically<50mV

Supply

Load

3Vto5.5V

TPS2480

TPS2481

SLUS939B – APRIL 2010 – REVISED DECEMBER 2010

www.ti.com

ADC Operation

The two analog inputs to the TPS2480/81, VINP and VINM, connect to a shunt resistor in the bus of interest. The

TPS2480/81 is typically powered by a separate supply from 3 V to 5 .5V. The bus being sensed can vary from 0

V to 26 V. There are no special considerations for power-supply sequencing (for example, a bus voltage can be

present with the supply voltage off, and vice-versa). The TPS2480/81 senses the small drop across the shunt for

shunt voltage, and senses the voltage with respect to ground from VIN– for the bus voltage. Figure 25 illustrates

this operation.

Figure 25. TPS2480/81 Configured For Current and Voltage Measurement

When the TPS2480/81 is in the normal operating mode (that is, MODE bits of the Configuration Register are set

to '111'), it continuously converts the shunt voltage up to the number set in the shunt voltage averaging function

(Configuration Register, SADC bits). The device then converts the bus voltage up to the number set in the bus

voltage averaging (Configuration Register, BADC bits). The Mode control in the Configuration Register also

permits selecting modes to convert only voltage or current, either continuously or in response to an event

(triggered).

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