MX844 Datasheet, PDF (1/21 Pages) IXYS Corporation – 12 BIT, MULTI-CHANNEL POWER & TEMP SENSOR FOR MONITOR & CONTROL SYSTEMS

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
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