Datenblatt-pdf.com


ADC0858BIV Schematic ( PDF Datasheet ) - National Semiconductor

Teilenummer ADC0858BIV
Beschreibung 8-Bit Analog Data Acquisition and Monitoring Systems
Hersteller National Semiconductor
Logo National Semiconductor Logo 




Gesamt 30 Seiten
ADC0858BIV Datasheet, Funktion
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






ADC0858BIV Datasheet, Funktion
Typical Performance Characteristics
Offset Error vs
Reference Voltage
Linearity Error vs
Reference Voltage
Total Unadjusted Error
vs Temperature
OSC Frequency
vs Temperature
OSC Frequency vs
Rext and Cext
TL H 11021 – 5
6

6 Page









ADC0858BIV pdf, datenblatt
ADC0851 Programming Chart
Function
Watchdog
Write 1 Limit
1 A D Conversion
Read 1 Limit
Test
Write all Limits
Auto A D Convert
Read all Limits
Mode
1000
1001
1010
1011
1100
1101
1110
1111
Receive (DI)
C11 C0
A3 A0 L0
I3 I0
A3 A0
L7
4 Bytes L0 First
C11 C0
Transmit
(DO)
T3 T0 C11 C0 P S3 S0
D0 D7 I3
L0 L7
I0
D0 D7 I3 I0
4 Bytes L0 First
ADC0858 Programming Chart
Function
Watchdog
Write 1 Limit
1 A D Conversion
Read 1 Limit
Test
Write all Limits
Auto A D Convert
Read all Limits
Receive (DI)
Mode
1000 C11 C0
1001 A3 A0 L0 L7
1010 I3 I0
1011 A3 A0
1100
1101 16 Bytes L0 First
1110 C11 C0
1111
Transmit
(DO)
T3 T0 C11 C0 P S15 S0
D0 D7 I3 I0
L0 L7
D0 D7 I3 I0
16 Bytes L0 First
Serial Communication Bit Order
Information Type
Limit Data
A D Conversion Data
Limit Address
Status
Channel Tag
Channel Configuration
Channel Information
Mode
Power Fail
Bit Order
ADC0851
ADC0858
First
Last First
Last
L0
D0
A3
S3
T3
C11
I3
M3
P (One Bit)
L7
D7
A0
S0
T0
C0
I0
M0
L0
D0
A3
S15
T3
C11
I3
M3
P (One Bit)
L7
D7
A0
S0
T0
C0
I0
M0
Comments
Send Data after INT
Write Limit to RAM
Send Data after Conversion
Send Limit from RAM
Do Not Use (See Text)
Write All Limits to RAM
Continuous Conversion
Send all Limits from RAM
Comments
Send Data after INT
Write Limit to RAM
Send Data after Conversion
Send Limit from RAM
Do Not Use (See Text)
Write all Limits to RAM
Continuous Conversion
Send all Limits from RAM
12

12 Page





SeitenGesamt 30 Seiten
PDF Download[ ADC0858BIV Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
ADC0858BIN8-Bit Analog Data Acquisition and Monitoring SystemsNational Semiconductor
National Semiconductor
ADC0858BIV8-Bit Analog Data Acquisition and Monitoring SystemsNational Semiconductor
National Semiconductor

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche