XR10910 Datasheet, PDF (1/19 Pages) Exar Corporation – 16:1 Sensor Interface

XR10910
16:1 Sensor Interface
General Description
The XR10910 is a unique sensor interface integrated circuit with an on-board
16:1 multiplexer, offset correction DAC, instrumentation amplifier and voltage
reference. The XR10910 is designed to integrate multiple bridge sensors
with a microcontroller (MCU) or field-programmable gate array (FPGA).
The integrated offset correction DAC provides digital calibration of the
variable and in many cases substantial offset voltage generated by the
bridge sensors. The DAC is controlled by an I2C compatible 2 wire serial
interface. The serial interface also provides the user with easy controls to the
XR10910’s many functions such as input and gain selection.
An integrated LDO provides a regulated voltage to power the input bridge
sensors and is selectable, between 3V and 2.65V, via the serial interface
for lower voltage compatibility. The LDO current can be sensed and a
proportional voltage present at the output of the IC for monitoring the LDO
current.
The XR10910 offers 8 fixed gain settings (from 2V/V to 760V/V), each with
an error of only ±0.5%, that are selectable via the I2C interface. It also offers
less than 1mV maximum input offset voltage, 100pA maximum input bias
current, and 100pA maximum input offset current.
The XR10910 is designed to operate from 2.7V to 5V supplies and is specified
over the industrial temperature range of -40°C to +85°C. It is offered in a
space saving 6mm x 6mm QFN-40 package. It consumes less than 556μA
maximum supply current and offers a sleep mode for added power savings.
The low power, low input bias current and integrated features make the
XR10910 well suited for both industrial and consumer applications using
bridge sensors.
F E AT U R E S
■■ Integrated features for interfacing multiple
bridge sensors with an MCU or FPGA:
❏❏ 16:1 differential mux with I2C interface
❏❏ Instrumentation amplifier
❏❏ LDO
❏❏ Offset correction DAC with I2C interface
(±560mV offset correction range - RTI)
■■ Eight selectable voltage gains from 2V/V
to 760V/V with only ±0.5% gain error
■■ 1mV maximum input offset voltage
■■ 100pA maximum input bias current
■■ 556μA maximum supply current
■■ 2.7V to 5V analog supply voltage range
■■ 1.8V to 5V digital supply voltage range
■■ -40˚C to +85˚C temperature range
■■ 6x6mm QFN-40
A P P L I C AT I O N S
■■ Bridge sensor interface
■■ Pressure & temperature sensors
■■ Strain gauge amplifier
■■ Industrial process controls
■■ Weigh scales
Ordering Information - back page
Typical Application
Bridge 16
Bridge 1
BRDG
VCC
LDO
IN16+
IN16-
INA /
PGA
OUT
ADC
µC
16:1
MUX
±560mV
offset trim
IN1+
10-bit
DAC
PGA
SDA
IN1-
I2C
Control
SCL
XR10910
16:1 Bridge Sensor Interface
© 2014-2015 Exar Corporation
1 / 19
exar.com/XR10910
Rev 1B