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PDF XR10910 Data sheet ( Hoja de datos )
| Número de pieza | XR10910 | |
| Descripción | 16:1 Sensor Interface | |
| Fabricantes | Exar | |
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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
IN16+
LDO
IN16-
16:1
MUX
IN1+
IN1-
INA /
PGA
±560mV
offset trim
10-bit
DAC
PGA
I2C
Control
XR10910
OUT
SDA
SCL
16:1 Bridge Sensor Interface
ADC
© 2014-2015 Exar Corporation
1 / 19
µC
exar.com/XR10910
Rev 1B
1 page  
I2C-BUS Timing Diagram
XR10910
Figure 1: Timing Diagram
© 2014-2015 Exar Corporation
5 / 19
exar.com/XR10910
Rev 1B
5 Page 
XR10910
Typical Performance Characteristics
TA = 25°C, VCC = 3.3V, VDD = 1.8V, RL = 10kΩ to 1.5V; G = 760; unless otherwise noted.
Sleep to Wake Time (DUT Output)
Set-up Time - from G = 2 to G = 300 (DUT Output)
2.5
G=2
2
Stop Time = 1% Settling
1.5
DUT OUTPUT
1
SDA
0.5
0
-0.5
0
Start Time = 50% Acknowledge
5 10
Time (µs)
15
20
4
3.5
3
SDA
2.5
Stop Time = 1% Settling
2
DUT OUTPUT
1.5
1 Start Time = 50% Acknowledge
0.5
0
0 5 10 15
Time (µs)
20
LDO Enable to Disable Time
4
3.5
3
2.5
2
1.5
1
0.5
0
-0.5
0
SDA
LDO Output
Stop Time = 1% Settling
Start Time = 50% Acknowledge
50 100 150 200 250
Time (µs)
LDO Disable to Enable Time
3.5
3
2.5 LDO OUTPUT
2
Stop Time = 1% Settling
1.5
1
SDA
0.5
0
Start Time = 50% Acknowledge
-0.5
0 10 20 30 40 50
Time (µs)
© 2014-2015 Exar Corporation
11 / 19
exar.com/XR10910
Rev 1B
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet XR10910.PDF ] | |
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