MSP430 datasheet(1/88 Pages) TI

номер детали	MSP430

подробное описание детали	AFEx8101 16-Bit and 14-Bit, Low-Power DACs With Voltage Reference and Diagnostic ADC for 4-mA to 20-mA Loop-Powered Applications

PDF	88 Pages

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производитель	TI [Texas Instruments]

домашняя страница	http://www.ti.com

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AFEx8101 16-Bit and 14-Bit, Low-Power DACs With Voltage Reference and

Diagnostic ADC for 4-mA to 20-mA Loop-Powered Applications

1 Features

• Functional Safety-Capable

– Documentation available to aid functional safety

system design: AFE88101, AFE78101

• Low quiescent current: 170 µA (typ)

• 16-bit or 14-bit monotonic high-performance DAC

– 1.8-V supply: 0.15 V to 1.25 V, 0.2 V to 1.0 V

– 5-V supply: 0.3 V to 2.5 V, 0.4 V to 2.0 V

– 4-LSB INL at 16 bits

– 0.07% FSR (max) TUE from –40°C to +125°C

• 12-bit 3.84-kSPS ADC for advanced diagnostics

• Integrated 1.25-V reference at 10 ppm/°C

• Internal 1.2288-MHz oscillator with clock output

• Digital interfaces:

– Serial peripheral interface (SPI)

– Universal asynchronous receiver-transmitter

(UART)

• Fault detection: CRC bit error checking, windowed

watchdog timer, diagnostic ADC

• Wide operating temperature: –55°C to +125°C

2 Applications

• 2-wire transmitters

• 4-mA to 20-mA loop-powered applications

• Process control and industrial automation

• Smart transmitters

• PLC or DCS I/O modules

3 Description

The

16-bit

AFE88101

and

14-bit

AFE78101

(AFEx8101) are highly-integrated, high-accuracy,

extremely

low-power

digital-to-analog

converters

(DACs) with voltage outputs designed for sensor-

transmitter applications.

The AFEx8101 devices include most of the

components required to design a 4

‑mA to 20‑mA,

2

‑wire (loop-powered) sensor transmitter. In addition

to the highly accurate DAC, these devices include a

10

‑ppm/°C voltage reference and a diagnostic analog-

to-digital converter (ADC). To accommodate intrinsic

and functional-safety concerns, external voltage-to-

current conversion and power regulation are required.

The internal diagnostic ADC is multiplexed to

several internal nodes that enable an automatic self-

health check. This check is capable of detecting

errors or malfunctions of the internal bias sources,

power regulator, voltage reference, DAC output, die

temperature, and optional external voltage source. If

any fault is detected from the diagnostic ADC, CRC

frame-error checking, or windowed watchdog timer,

the devices can optionally issue an interrupt, enter a

fail-safe state corresponding to a standard NAMUR

output value or user-specified custom value, or both.

These devices operate from supplies as low as 1.71 V

with a maximum quiescent current of 210 µA. The

devices are specified over the temperature range of

–40°C to +125°C, but are functional from –55°C to

+125°C.

Device Information

PART NUMBER

RESOLUTION

PACKAGE(1)

AFE78101

14-bit

RRU (UQFN, 24)

4.00 mm × 4.00 mm

AFE88101

16-bit

(1)

For all available packages, see the package option

addendum at the end of the data sheet.

MUX

12-Bit ADC

MUX

Internal

Diagnostics

Temperature

Sensor

AIN0

POL_SEL/AIN1

16-/14-Bit

DAC

VOUT

Alarm

Diagnostics

Alarm

Responses

User

Calibration

Slew-Rate

Control

DAC Data

Register

Watchdog

Timer

CRC Frame

Error Check

ALARM

Control Logic

CS

SDI

SDO

SCLK

SCLR

UARTIN

UARTOUT

PVDD

VDD

GND

Internal

Reference

VREFIO

REF_EN

REF_GND

IOVDD

RESET

Internal

Oscillator

CLK_OUT

IRQ (UARTOUT or SDO)

Output Buffer

Range Setting

Functional Block Diagram

AFE78101, AFE88101

SLASF21 – DECEMBER 2022

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

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