INA4235中文資料德州儀器數(shù)據(jù)手冊PDF規(guī)格書

1 Features

? High-side or low-side current sensing

? Operates from a 1.7V to 5.5V power supply

? Reports current, voltage, power, and energy

? Programmable full scale range: 20mV / 80mV

? Input common mode range: –0.3V to 48V

? Current monitoring accuracy:

– 16-bit ADC resolution

– 0.1% gain error (maximum)

– 10μV offset (maximum)

? Power monitoring accuracy:

– 0.2% full scale (maximum)

? Energy monitoring accuracy:

– 0.7% full scale (maximum)

? Low input bias currents: 5nA (maximum)

? Low disable current: 50nA (maximum)

? Configurable averaging options

? Alert limits for over and under current events

? 1.2V compliant I2C, SMBus interface

? 16-pin selectable addresses

? DSBGA-16 Package (1.5mm × 1.5mm)

2 Applications

? Notebook computers

? Security cameras

? Retail automation

? Power management

? Battery cell monitors and balancers

? Rack servers

3 Description

The INA4235 device is a quad channel 16-bit

digital current monitor with an I2C/SMBus-compatible

interface that is compliant with digital bus voltages

from 1.2V to 5V. The device monitors the voltage

across an external sense resistor and reports values

for shunt voltage, bus voltage, current, power, and

energy for each channel.

The INA4235 features programmable ADC conversion

times and averaging that is common for all channels.

Each channel has a programmable calibration value

with an internal multiplier that enables direct readouts

of current in amperes, power in watts, and energy in

joules. Each channel monitors the bus voltage present

on the IN– pin and can alert on overcurrent and

undercurrent conditions, as well as on overvoltage

and undervoltage conditions. High input impedance

while in current measurement mode allows use of

larger current sense resistors needed to measure

small value system currents.

The INA4235 senses current on common-mode

bus voltages that can vary from –0.3V to 48V,

independent of the supply voltage. The device

operates from a single 1.7V to 5.5V supply, drawing

a typical supply current of 400μA in normal operation.

The device can be placed in a low-power standby

mode where the typical operating current is 2.5μA

and can be fully disabled using the enable pin to

achieve an supply current less than 50nA. The device

is specified over the operating temperature range

between –40°C and 125°C and features up to 16

programmable addresses.