SX8723 데이터 시트보기 (PDF) - Semtech Corporation

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SX8723

ZoomingADC™ for Pressure and Temperature Sensing

Semtech Corporation 

SX8723

ZoomingADC™ for Pressure and Temperature Sensing

ADVANCED COMMUNICATIONS & SENSING

Circuit Description

General Description

The SX8723 is a complete low-power acquisition path with programmable gain, acquisition speed and

resolution.

Block Diagram

SX8723

+

-

+

+

VREF -

-

VBATT

ZoomingADCTM

AC0

AC1

AC2

AC3

PGA

ADC

AC4

AC5

READY

D0/REFOUT

D1/REFIN

CONTROL LOGIC

GPIO

CHARGE

PUMP

4MHz

OSC

I2C

SCL

SDA

VPUMP

VSS

Figure 3 - SX8723 Block Diagram

VREF

The internally generated VREF is a trimmed bandgap reference with a nominal value of 1.22V that provides a

stable voltage reference for the ZoomingADC.

This reference voltage is directly connected to one of the ZoomingADC reference multiplexer inputs.

The bandgap voltage stability is only guaranteed for VBATT voltages of 3V and above. As VBATT drops down to

2.4V, the bandgap voltage could reduce by up to 50mV.

The bandgap has relatively weak output drive so it is recommended that if the bandgap is required as a signal

input then PGA1 must be enabled with Gain = 1.

V1.5 © 2007 Semtech Corp.

10

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