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National Semiconductor - 8-Bit Analog Data Acquisition and Monitoring Systems

Numéro de référence ADC0851BIN
Description 8-Bit Analog Data Acquisition and Monitoring Systems
Fabricant National Semiconductor 
Logo National Semiconductor 





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ADC0851BIN fiche technique
January 1995
ADC0851 and ADC0858 8-Bit Analog Data
Acquisition and Monitoring Systems
General Description
The ADC0851 and ADC0858 are 2 and 8 input analog data
acquisition systems They can function as conventional mul-
tiple input A D converters automatic scanning A D convert-
ers or programmable analog ‘‘watchdog’’ systems In
‘‘watchdog’’ mode they monitor analog inputs and deter-
mine whether these inputs are inside or outside user pro-
grammed window limits This monitoring process takes
place independent of the host processor When any input
falls outside of its programmed window limits an interrupt is
automatically generated which flags the processor the chip
can then be interrogated as to exactly which channels
crossed which limits
The advantage of this approach is that its frees the proces-
sor from having to frequently monitor analog variables It
can consequently save having to insert many A D subrou-
tine calls throughout real time application code In control
systems where many variables are continually being moni-
tored this can significantly free up the processor especially
if the variables are DC or slow varying signals
The Auto A D conversion feature allows the device to scan
through selected input channels performing an A D conver-
sion on each channel without the need to select a new
channel after each conversion
Applications
Y Instrumentation monitoring and process control
Y Digitizing automotive sensor signals
Y Embedded diagnostics
Key Specifications
Y Resolution
Y Total error
Y Low power
Y Conversion time
Y Limit comparison time
8 Bits
g LSB or g 1 LSB
50 mW
18 ms Channel
2 ms Limit
Features
Y Watchdog operation signals processor when any
channel is outside user programmed window limits
Y Frees microprocessor from continually monitoring
analog signals and simplifies applications software
Y 2 (ADC0851) or 8 (ADC0858) analog input channels
Y Single ended or differential input pairs
Y COM input for DC offsetting of input voltage
Y 4 (ADC0851) and 16 (ADC0858) 8-bit programmable
limits
Y NSC MICROWIRETM interface
Y Power fail detection
Y Auto A D conversion feature
Y Single 5V supply
Y Window limits are user programmable via serial inter-
face
Simplified Block Diagram
TRI-STATE is a registered trademark of National Semiconductor Corporation
MICROWIRETM is a trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL H 11021
FIGURE 1
TL H 11021 – 22
RRD-B30M75 Printed in U S A

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