SX8725 datasheet(39/53 Pages) SEMTECH

39 / 53 page

ADVANCED COMMUNICATIONS & SENSING

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SX8725

ZoomingADC™ for Pressure and Temperature Sensing

Power Reduction

The ZoomingADC is particularly well suited for low-power applications. When very low power consumption is

of primary concern, such as in battery operated systems, several parameters can be used to reduce power

consumption as follows:

Operate the acquisition chain with a reduced supply voltage VDD.

Disable the PGAs which are not used during analog-to-digital conversion with ENABLE[3:0].

Disable all PGAs and the ADC when the system is idle and no conversion is performed.

Use lower bias currents in the PGAs and the ADC using the control words IB_AMP_PGA[1:0] and

IB_AMP_ADC[1:0].

Reduce sampling frequency.

Finally, remember that power reduction is typically traded off with reduced linearity, larger noise and slower

maximum sampling speed.

Recommended Design for Other 2-WIRE Devices Connection

SX8725 does not support multiple devices on the same 2-WIRE bus. A separate 2-WIRE bus should be used to

address other devices as seen on the following schematic.

SX8725

AC2

AC3

D0 D1

VBATT

VPUMP

VSS

READY

SCL

SDA

SCL1

SDA1

I2C 1

I2C 2

EEPROM

(or other

devices)

GND

VCC

GND

Figure 22 - Recommended connections with other devices

SX8725 Datasheet(PDF) 39 Page - Semtech Corporation