Datasheet

VA
Internal
CLK
Ext. Clk
Detect
CLK/
XIN
XOUT
CSB
SCLK
SDI
SDO/DRDYB
VREFP1
VREFN1
VIN0
VIN1
VIN2
VIN3
VIN4
VIN5
IB1
IB2
VA
EXC.
CURRENT
GND
GPIO
D0
D6/
DRDYB
Open/Short
Sensor Diag.
VIO
EXC.
CURRENT
SERIAL I/F
CONTROL
&
CALIBRATION
DATA PATH
POR
16 bit 6'
Module
DIGITAL
FILTER
CLK
MUX
BUFF
VIN6/VREFP2
MUX
Chip Configurable
Channel Configurable
Fixed
LMP900xx
BACKGROUND
CALIBRATION
PGA
1x, 2x,
4x, 8x
VIN7/VREFN2
VREF
FGA
16x
INPUT MUX
LMP90080/
LMP90078 only
LMP90080/
LMP90079 only
LMP90080
IB1
Micro-
Controller
SCLK
VIN0
VIN2
VIN4
VIN6/VREFP2
4-Wire RTD
3-Wire RTD
2 -Wire RTD
1
4
2
3
...
...
VIN7/
VREFN2
CSB
SDO/DRDYB
SDI
D0
D6/DRDYB
...
XOUT
CLK/XIN
GND
VA
IB2
VREFN1
...
VIO
VA
LEDs/
Switches
VREFP1
Thermocouple
+
-
Product Channel Configuration Current Sources
LMP90080 4 Differential/7 Single-Ended Yes
LMP90079 4 Differential/7 Single-Ended No
LMP90078 2 Differential/4 Single-Ended Yes
LMP90077 2 Differential/4 Single-Ended No
LM90xxx 16-bit Sensor AFE Family of Products
LMP90077, LMP90078, LMP90079, LMP90080
SNAS521F –JULY 2011–REVISED MARCH 2013 www.ti.com
Typical Application
Block Diagram
Figure 1. Block Diagram
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