Datasheet > AFE88101RRUR

AFE88101RRUR

更新时间： 2023-09-03 20:33:50

品牌	Logo	应用领域
德州仪器 - TI		传感器
页数	文件大小	规格书
87页	4365K
描述
适用于传感器和现场变送器应用的单通道、低功耗、16 位 DAC \| RRU \| 24 \| -55 to 125

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AFE88101RRUR 数据手册

AFE78101, AFE88101

ZHCSP80 –DECEMBER 2022

www.ti.com.cn

A rectifier is also implemented for reverse polarity protection so that the design can be connected to the bus

regardless of the pin orientation or polarity without damage to the design.

8.2.1.2.4 System Current Budget

Power consumption is an important consideration when designing two-wire transmitters. Power supplied from

the loop must power all the circuitry related to the transmitter and sensor. The minimum loop current in two-wire

applications is typically 4 mA. However, for error indications, this current is as low as 3.375 mA. Therefore, the

power budget of all transducer circuitry must be less than the maximum allowable system power budget of 3 mA.

表 8-2 lists the specified maximum quiescent current of all included active components (provided from the

respective data sheets).

表8-2. Typical Component Currents

DEVICE

TPS7A0230

DESCRIPTION

TYPICAL CURRENT (µA)

LDO

0.025

AFE88101

16-bit DAC

170

OPA333 (2)

Operational amplifier

Shunt regulator

Microcontroller

Digital isolation

TLVH431B

MSP430

Dependent on firmware

Dependent on communications

ISO7021D (2), ISO7041F

8.2.1.3 Application Curves

图8-7. Circuit Start-Up

8.3 Initialization Set Up

This section describes several recommendations to set up the AFEx8101.

The AFEx8101 power up with the CRC enabled. If the device is intended to be run without the CRC, the CRC

must be disabled by setting the CRC_EN bit to 0h in the CONFIG register. Be aware that the command to write

to this register is first done with the CRC enabled. The CRC byte must be appended to the command for the

device to interpret the command correctly. To disable the CRC after start up, write 0x02 0x00 0x26 0x24 to the

device. The first three bytes write the command, while the last byte is the CRC byte. For more information on the

CRC, see the communication description in 节7.5.2.3.

The AFEx8101 also power up with the SDO pin disabled. The SDO is required for reading from any of the device

registers, as well as reading any data from the ADC in SPI mode. The SDO is enabled by writing 0h into the

DSDO bit in the CONFIG register. See also 节7.5.2.1 and 节7.5.2.2.

To enable the ADC, first enable the ADC buffer by writing 0h into the BUF_PD bit in the ADC_CFG register.

Information about using the ADC in different modes of operation is in 节7.3.2.

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