LMP92001SQE/NOPB National Semiconductor, LMP92001SQE/NOPB Datasheet - Page 3

• Manufacturer Part Number: LMP92001SQE/NOPB
• Description: IC ANALOG MONITOR/CTLR 54LLP
• Manufacturer: National Semiconductor

Specifications of LMP92001SQE/NOPB

• Applications: General Purpose
• Current - Supply: 4mA
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 54-WFQFN Exposed Pad
• Operating Temperature (min): -40C
• Operating Temperature Classification: Automotive
• Operating Temperature (max): 125C
• Package Type: LLP EP
• Rad Hardened: No
• Supply Voltage Range: 4.75V To 5.5V
• Operating Temperature Range: -40°C To +125°C
• Digital Ic Case Style: LLP
• No. Of Pins: 54
• Peak Reflow Compatible (260 C): Yes
• Leaded Process Compatible: Yes
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LMP92001SQE/NOPBTR

6.0 Overview
The LMP92001 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 pro-
grammable supervisor, such as a microcontroller, and an
analog system whose behavior is to be monitored and con-
trolled by the supervisor.
To facilitate analog monitoring functionality, the device con-
tains a single 12-bit ADC fronted by a 17-input multiplexor.
The 16 MUX inputs are available to the user via pins IN[16:1].
The last remaining MUX channel is reserved for the internal
analog temperature sensor.
The analog control functionality is served by twelve 12-bit
voltage output DACs. Besides producing voltage correspond-
ing to the digital input code, the DACs can be forced by the
user to either rail instantaneously.
Additional digital monitoring and control can be realized via
the General Purpose I/O port GPIO[7:0].
Two more blocks are present for added functionality: a local
temperature sensor (already mentioned above) and an inter-
nal reference voltage generator.
6.1 17-CHANNEL ANALOG SENSE WITH 12-BIT ADC
The user can monitor up to 16 external voltages with the 12-
bit ADC and its 17-channel input MUX. Typically these volt-
ages will be generated by the analog sensors, instrumenta-
tion amplifiers, current sense amplifiers, or simply resistive
dividers if high potentials need to be measured. Channel 17
of the input MUX is reserved for the internal temperature sen-
sor, and is not available as an external input to the device.
User can program which MUX channels to enable, and
whether to convert these channel inputs in sequence contin-
uously, or in a single-shot mode. Upon completion all con-
version results are stored in the internal data registers, and
can be read back by the user via the I
Analog input channels 1-3 and 9-11 have a built-in digital
window comparator function with user programmable thresh-
olds. This function can be used to alert the supervisor micro-
controller of an out-of-bound condition. The comparator
function result is stored in the internal status register which is
user accessible. It can also be used as the interrupt signal
generator where the out of bound conditions will be reported
via the INT[2:1] output pins.
Sequencing of the analog sense system is governed by the
internal controller. Once enabled the MUX, the ADC, the win-
dow comparator and the interrupts perform their function
without further user intervention.
6.2 PROGRAMMABLE ANALOG CONTROL VOLTAGE
OUTPUTS
Twelve identical individually programmable 12-bit DAC
blocks are available to generate analog voltages, which can
2
C-compatible interface.
3
be used to control bias conditions of external circuits, position
of servos, etc.
In case simultaneous update of all outputs to the same level
is needed, a single internal register is provided that effects
simultaneous update of all DAC data registers.
A DAC, by definition, produces an output in the range of GND
to DREF. In some systems, however, it may be desirable for
the OUT pins to produce either GND or VDD, i.e., beyond
DREF. This is made possible via the asynchronous DAC con-
trol inputs C[4:1]. When activated, these inputs will force the
OUT pins to either rail. The choice of rail is made in the inter-
nal control register.
6.3 INTERNAL ANALOG TEMPERATURE SENSOR
An on-board analog temperature sensor is available to mon-
itor the device’s own temperature. Once enabled, the analog
temperature sensor output is sampled via the MUX channel
17, and its conversion result is stored in the internal register
for user read back.
6.4 INTERNAL VOLTAGE REFERENCE SOURCE
Another resource available to the user is the internal, tem-
perature-compensated reference voltage source. By default
both ADC and DACs expect reference potentials to be sup-
plied externally. The user can choose to enable the internal
reference and use it with the ADC and/or the DACs.
The internal reference source cannot drive an external load.
6.5 8-BIT GENERAL PURPOSE I/O
The GPIO port can be used to expand the microcontroller ca-
pabilities. This port is memory mapped to the internal register,
which in turn is accessible via the I
Since each bit is individually programmable as an Input or
Output, the port is ideally suited for external switch control and
status flag monitoring, without further burdening of microcon-
troller I/O resources.
6.6 I
The
LMP92001 via a popular I
This interface provides the user full access to all Data, Status
and Control registers of the device.
There are 2 address setting pins, AS[1:0], that allow the de-
vice to occupy any one of 9 possible Interface Addresses on
the bus.
Block Access commands are provided to minimize the trans-
fer overhead of larger data sets.
2
C-COMPATIBLE INTERFACE
microcontroller
supervisor
2
C-compatible 2–wire interface.
2
C-compatible interface.
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