MX844RTR 查看數據表（PDF） - IXYS CORPORATION

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MX844RTR

12 BIT, MULTI-CHANNEL POWER & TEMP SENSOR FOR MONITOR & CONTROL SYSTEMS

IXYS CORPORATION 

IXYS MX844

12 BIT, MULTI-CHANNEL POWER & TEMP

SENSOR FOR MONITOR & CONTROL SYSTEMS

Features:

• Wide Input Supply Range: 4.5V to 40V

• Programmable gain differential amplifier

(±10mV, ±25mV, ±50mV, ±250mV ranges)

• 4 channel differential input multiplexer

(3 input channels plus ground)

• Integrated 12-bit ADC

• Serial data output (SDO) with data ready pin

• Fine calibration of Full Scale Range (FSR)

using VTRIM pin

• Bi-directional Current Sense

• Internal temperature sensor with 0.2°C

resolution

• Compatible with 3.3V and 5V

Microcontrollers

• Operating Temperature Range: -40°C to

85°C

• 5mm x 5mm, QFN-28 RoHS Package

Ordering Information

Part No. Description

MX844R QFN-28 Tube

MX844RTR QFN-28 Tape & Reel

Qty

73

2500

Description:

The MX844 is a fully integrated subsystem that

measures temperature plus differential current and

voltage. An internal temperature sensor measures

ambient temperature with 2.5°C accuracy. Current

and voltage measurements are made differentially

through a four input multiplexer connected to a

programmable gain fully differential sense amplifier.

The differential sense amplifier is optimized to

measure very small positive or negative voltages

near ground for low side bi-directional sensing. A

dual slope ADC converts the temperature sensor or

sense amplifier outputs to a 12-bit digital word that

includes 3 ½ digits plus sign. The input multiplexer

channel and programmable gain amplifier range may

be changed between ADC conversions. An on-chip

voltage regulator enables the MX844 to operate over

a wide input voltage range of 4.5 to 40 volts.

Controller interrupt or over-voltage/over-current

signals may be generated by a pair of 12-bit digital

comparators configured as a window comparator or

simple threshold detection function. The serial port

supports standard 4-wire synchronous serial data, or

asynchronous serial “talk-only” data, and is

compatible with most 3.3V and 5V microcontrollers.

DRV

RIN

VIN

IN1P

IN2P

IN3P

IN1N

IN2N

IN3N

GND

VTRIM

VCC

Regulator

BUF CAZ CINT IZ

Registers

ADC

Control

Serial

I/O

Te m p e ra tu re

Sensor

Divider

M1

SDI

SDO

SCK

CS

AOUT

DRDY

CMP

X1

X2

SYNC

Typical Application:

Charging

system

MX844

Batt Load

IN

uP

T

IN

IN

Rectifier

Load

MX844

IN

IN

93C46

eeprom

uP

Battery charge/discharge current, voltage, temperature

Isolated voltage, current, and temperature sensing

MX844

Drawing No. 084423

1

08/25/06

www.claremicronix.com

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