Multiplexer

LMP92018

8

Temp. Sensor

Int/Ext

Ref

4

SPI

Interface

12

GPIO

REF

GPIO[11:0]

CSB

SCLK

DIN

DOUT

OUT3

OUT0

IN[7:0]

DRDYB

VGPIO

VIO

VDD

GND

LMP92018

www.ti.com

SNAS514B – NOVEMBER 2011 – REVISED MAY 2013

Overview

The LMP92018 has a flexible, feature-rich functionality which makes it ideally suited for many analog monitoring

and control applications, for example, base-station PA subsystems. This device provides the analog interface

between a programmable supervisor, such as a microcontroller, and an analog system whose behavior is to be

monitored and controlled by the supervisor.

To facilitate the analog monitoring functionality, the device contains a single 10-bit ADC preceded by a 8-input

multiplexor.

The analog control functionality is served by four 10-bit voltage output DACs.

Additional digital monitoring and control can be realized via the General Purpose I/O port GPIO[11:0].

Two more blocks are present for added functionality: a local temperature sensor and an internal reference

voltage generator.

8-CHANNEL ANALOG SENSE WITH 10-BIT ADC

The user can monitor up to 8 external voltages with the 10-bit ADC and its 8-channel input MUX. Typically these

voltages will be generated by the analog sensors, instrumentation amplifiers, current sense amplifiers, or simply

resistive dividers if high potentials need to be measured.

PROGRAMMABLE ANALOG CONTROL VOLTAGE OUTPUTS

Four identical individually programmable 10-bit DAC blocks are available to generate analog voltages, which can

be used to control bias conditions of external circuits, position of servos, etc.

INTERNAL DIGITAL TEMPERATURE SENSOR

An on-board digital temperature sensor is available to report the device's own temperature. The temperature

sensor output is stored in the internal register for user readback via the SPI interface.

INTERNAL VOLTAGE REFERENCE SOURCE

The user can choose to enable the internal reference of 2.5V to use with the ADC and/or DACs. The internal

reference source can also drive an external load.

12-BIT GENERAL PURPOSE I/O

The GPIO port can be used to expand the microcontroller capabilities. This port is memory mapped to the

internal register, which in turn is accessible via the SPI interface. Each bit is individually programmable as an

input or an output

Copyright © 2011–2013, Texas Instruments Incorporated

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