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TI-LMP92018.pdf
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TI-LMP92018.pdf
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Multiplexer
ADC
LMP92018
8
Temp. Sensor
DAC
DAC
DAC
DAC
Int/Ext
Ref
4
SPI
Interface
12
GPIO
REF
GPIO[11:0]
CSB
SCLK
DIN
DOUT
OUT3
OUT0
IN[7:0]
DRDYB
VGPIO
VIO
VDD
GND
LMP92018
www.ti.com
SNAS514B –NOVEMBER 2011–REVISED MAY 2013
LMP92018 Analog System Monitor and Controller
Check for Samples: LMP92018
1
FEATURES
APPLICATIONS
2
• 8 ANALOG VOLTAGE MONITORING
• Communication Infrastructure
CHANNELS
• System Monitoring and Control
– 10-Bit ADC with Programmable Input MUX
• Industrial Monitoring and Control
– Internal/External Reference
DESCRIPTION
– Tolerates High-Source Impedance at Lower
LMP92018 is a complete analog monitoring and
Sampling Rates
control circuit which integrates an eight channel 10-bit
• 4 PROGRAMMABLE ANALOG VOLTAGE
Analog-to-Digital Converter (ADC), four 10-bit Digital-
OUTPUTS
to-Analog Converters (DACs), an internal reference,
– Four 10-Bit DACs
an internal temperature sensor, a12-bit GPIO port,
and a 10MHz SPI interface.
– Internal/External Reference
– Drives Loads up to 1nF
The eight channels of the ADC can be used to
monitor rail voltages, current sense amplifier outputs,
• VOLTAGE REFERENCE
health monitors or sensors while the four DACs can
– User-Selectable Source: External or Internal
be used to control PA (Power Amplifier) bias points,
– Internal Reference 2.5V
control actuators, potentiometers, etc.
• TEMPERATURE SENSOR
Both the ADC and DACs can use either the internal
– ±2.5°C Accuracy
2.5V reference or an external reference
independently allowing for flexibility in system design.
• 12-BIT GPIO PORT
– Each Bit Individually Programmable
The built-in digital temperature sensor enables
accurate (±2.5°C) local temperature measurement
– User-Selectable Rail
whose value is captured in the user accessible
• SPI-COMPATIBLE BUS
register.
– User-Selectable Rail
Block Diagram
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2011–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
LMP92018
uC
Temp
IN[7:0]
REF
Ratiometric
Sensing
Scaled
Voltage
Sensing
Current
sensing
Analog
Sensors
LMP8640
LM94023
+
-
ROUT<10k
8
Servo
OUT[3:0]
Actuator
Control
PA
Bias
Control
12
Digital
Control
Digital
Status
Indicators
4
DRDYB
4
CSB
SCLK
DIN
DOUT
VDD
5V
5V
48V
VGPIO
Voltage
Source
GPIO[11:0]
1.8V
3.3V
VIO
Voltage
Sense
Channels
Analog
Voltage
Control
Bidirectional
Digital Bus
SPI
LMP92018
SNAS514B –NOVEMBER 2011–REVISED MAY 2013
www.ti.com
DESCRIPTION (CONTINUED)
The LMP92018 also includes a 12-bit GPIO port which allows for the resources of the microcontroller to be
further extended, thus providing even more flexibility and reducing the number of signal interfacing to the
microcontroller.
Both the GPIO port and the SPI compatible interface have independent supply pins enabling the LMP92018 to
interface with low voltage microcontrollers.
The LMP92018 is available in a space saving 36-pin WQFN package and is specified over the full -30°C to
+85°C temperature range.
Typical Application
2 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated
Product Folder Links: LMP92018
Multiplexer
ADC
LMP92018
8
Temp. Sensor
DAC
DAC
DAC
DAC
Int/Ext
Ref
4
SPI
Interface
12
GPIO
REF
GPIO[11:0]
CSB
SCLK
DIN
DOUT
OUT3
OUT0
IN[7:0]
DRDYB
VGPIO
VIO
VDD
GND
LMP92018
www.ti.com
SNAS514B –NOVEMBER 2011–REVISED MAY 2013
Overview
The LMP92018 has a flexible, feature-rich functionality which makes it ideally suited for many analog monitoring
and control applications, for example, base-station PA subsystems. This device provides the analog interface
between a programmable supervisor, such as a microcontroller, and an analog system whose behavior is to be
monitored and controlled by the supervisor.
To facilitate the analog monitoring functionality, the device contains a single 10-bit ADC preceded by a 8-input
multiplexor.
The analog control functionality is served by four 10-bit voltage output DACs.
Additional digital monitoring and control can be realized via the General Purpose I/O port GPIO[11:0].
Two more blocks are present for added functionality: a local temperature sensor and an internal reference
voltage generator.
8-CHANNEL ANALOG SENSE WITH 10-BIT ADC
The user can monitor up to 8 external voltages with the 10-bit ADC and its 8-channel input MUX. Typically these
voltages will be generated by the analog sensors, instrumentation amplifiers, current sense amplifiers, or simply
resistive dividers if high potentials need to be measured.
PROGRAMMABLE ANALOG CONTROL VOLTAGE OUTPUTS
Four identical individually programmable 10-bit DAC blocks are available to generate analog voltages, which can
be used to control bias conditions of external circuits, position of servos, etc.
INTERNAL DIGITAL TEMPERATURE SENSOR
An on-board digital temperature sensor is available to report the device's own temperature. The temperature
sensor output is stored in the internal register for user readback via the SPI interface.
INTERNAL VOLTAGE REFERENCE SOURCE
The user can choose to enable the internal reference of 2.5V to use with the ADC and/or DACs. The internal
reference source can also drive an external load.
12-BIT GENERAL PURPOSE I/O
The GPIO port can be used to expand the microcontroller capabilities. This port is memory mapped to the
internal register, which in turn is accessible via the SPI interface. Each bit is individually programmable as an
input or an output
Copyright © 2011–2013, Texas Instruments Incorporated Submit Documentation Feedback 3
Product Folder Links: LMP92018
ESD+
ESD+
8
7
6
5
4
3
2
1
9
35
34
33
32
31
30
29
28
36
11
12
13
14
15
16
17
18
10
20
21
22
23
24
25
26
27
19
DIN
SCLK
CSB
VIO
VGPIO
GND
GND
VDD
DOUT
GPIO7
DRDYB
OUT2
OUT1
OUT0
GND
GPIO11
GPIO10
GPIO9
OUT3
IN7
IN6
IN5
IN4
IN3
IN2
IN1
REF
DAP
GPIO8
GPIO6
GPIO5
GPIO4
GPIO3
GPIO2
GPIO1
GPIO0
IN0
LMP92018
SNAS514B –NOVEMBER 2011–REVISED MAY 2013
www.ti.com
SPI INTERFACE
The microcontroller communicates with LMP92018 via a popular SPI interface. This interface provides the user
full access to all Data, Status and Control registers of the device.
Connection Diagram
Figure 1. 36-Pin WQFN (Top View)
See NJK0036A Package
PIN DESCRIPTIONS
Name Pin Function ESD Structures
VDD 1 Supply rail
VGPIO 4 GPIO rail
VIO 5 SPI rail
GND 2, 3 14 Device Ground
Die Attach Pad. For best thermal
conductivity and best noise immunity
DAP * DAP should be soldered to the PCB pad
which is connected directly to circuit
common node (GND).
IN[7:0] 35:28 Analog input
4 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated
Product Folder Links: LMP92018
ESD+
ESD+
LMP92018
www.ti.com
SNAS514B –NOVEMBER 2011–REVISED MAY 2013
PIN DESCRIPTIONS (continued)
Name Pin Function ESD Structures
OUT[3:0] 10:13 Analog output
DOUT 9 SPI Data Output
General Purpose Digital I/O. Logic level
GPIO[11:0] 15:18; 20:27
is referenced to VGPIO pin.
CSB 6 SPI Chip Select, Active LO
SCLK 7 SPI Data Clock
DIN 8 SPI Data Input
DRBYB 19 Data Ready, open-drain active LO
ADC/DAC Voltage Reference Input or
REF 36
Output
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
Absolute Maximum Ratings
(1)(2)(3)
VDD Relative to GND −0.3V to 6.0V
VIO Relative to GND −0.3V to VDD
VGPIO Relative to GND −0.3V to VDD
Voltage between any 2 pins
(4)
6.0V
Current in or out of any pin
(4)
5mA
32mA, T
A
= 125°C
Current through VDD
44mA, T
A
= 85°C
Current through VGPIO 20mA, T
A
= 125°C
54mA, T
A
= 125°C
Current through GND
66mA, T
A
= 85°C
Junction Temperature +150°C
Storage Temperature Range −65°C to +150°C
Human Body Model 2500V
ESD Susceptibility
(5)
Machine Model 200V
Charged Device Model 1500V
(1) “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur, including inoperability and degradation of
device reliability and/or performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or
other conditions beyond those indicated in the Recommended Operating Conditions is not implied. The recommended Operating
Conditions indicate conditions at which the device is functional and the device should not be operated beyond such conditions.
(2) All voltages are measured with respect to GND = 0V, unless otherwise specified.
(3) If Military/Aerospace specified devices are required, please contact the TI Sales Office/Distributors for availability and specifications.
(4) When the input voltage (VIN) at any pin exceeds power supplies (VIN < GND or VIN > VDD), the current at that pin must not exceed
5mA, and the voltage (VIN) at that pin relative to any other pin must not exceed 6.0V. See Pin Descriptions for additional details of input
circuit structures.
(5) The Human Body Model (HBM) is a 100 pF capacitor charged to the specified voltage then discharged through a 1.5kΩ resistor into
each pin. The Machine Model (MM) is a 200 pF capacitor charged to specified voltage then discharged directly into each pin. The
Charged Device Model (CDM) is a specified circuit characterizing an ESD event that occurs when a device acquires charge through
some triboelectric (frictional) or electrostatic induction process and then abruptly touches a grounded object or surface.
Copyright © 2011–2013, Texas Instruments Incorporated Submit Documentation Feedback 5
Product Folder Links: LMP92018
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