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PDF LX1800 Data sheet ( Hoja de datos )
| Número de pieza | LX1800 | |
| Descripción | SMBus to Analog Interface | |
| Fabricantes | Microsemi Corporation | |
| Logotipo |  |
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LX1800
TM ® SMBus to Analog Interface
PRODUCTION DATA SHEET
DESCRIPTION
The LX1800 bridges the analog and The LX1800 has an internal bandgap
digital world. The analog interface reference and also allows the use of an
contains and eight bit ADC and 8 bit external reference. The external
DAC and the digital interface is a reference can be used as an analog input
serial data SMBus interface. The for volume control using the DAC or to
LX1800 works well in a feedback provide wider range for high amplitude
control system such as an LCD analog signals.
backlight system where the analog The 8 pin MLP package is small
output of an ambient light sensor such occupying no more area than a TSOT
as the LX1972 can be digitized package.
allowing the micro controller to adjust
the analog dimming signal
accordingly.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
KEY FEATURES
8 bit accuracy
ADC and DAC in one package
Fully compliant to standard
SMBus
Bus controllable Sleep mode
Optional external reference
APPLICATIONS
Processor controlled dimming
VID control interface
Digital regulator control
Audio volume control
PRODUCT HIGHLIGHT
3.3V
To µP
SCL
SCD
GND
ADR
VDD
REF
AIN
AOUT
LX1800
LX1972
BRT
LX1691
Based
Module
CCFL
Copyright © 2004
Rev. 1.0, 2006-01-05
TJ (°C)
-40 to +85
PACKAGE ORDER INFO
Plastic MLP
LD 8-pin
RoHS Compliant / Pb-free
LX1800ILD
Note: Available in Tape & Reel. Append the letters “TR” to the part number.
(i.e. LX1800ILD-TR)
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
1 page  
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LX1800
TM ® SMBus to Analog Interface
PRODUCTION DATA SHEET
SMBUS REGISTER MAP
Each register has an address which is programmed into the index register. The value in the index register determines
which register is accessed on a given read or write operation.
Control Register:
Address = xxxxxx00b
Type = Read/Write
Default = 10000000
Bit Assignments:
7 Sleep Mode
1 = active mode, 0 = sleep mode
6 Reference
1 = external, 0 = internal
5 ADC Start
1 = start A/D; this bit is reset to 0 when conversion complete.
4 ADC Mode
1 = always on; 0 = turn on as required
3 Invert DAC Mode 1 = normal DAC bit polarity; 0 = inverted DAC input polarity
2 ADC Loop Back 1 = ADC drives DAC directly; 0 = DAC input comes from Bus
1 ADC Continuous 1 = ADC continuously converts; 0 = ADC on Bus command
0 ADC Clock Mode 1 = ADC uses SCL clock; 0 = ADC uses internal clock.
DAC Register:
Address = xxxxxx01b
Type = Read/Write
Default = 10000000b
Bit Assignments: FFh = full scale (VREF); 00h = 0V (normal polarity mode)
ADC Register:
Address = xxxxxx10b
Type = Read Only
Default = 00000000b
Bit Assignments: FFh = full scale (VREF); 00h = 0V
MISC Register:
Address = xxxxxx11b
Type = Read/Write for bits 7:4; Read Only for bits 3:0
Default = 00000101b
Bit Assignments:
7:4 Unassigned
3:2 Version
1:0 Revision
01b = version 1
01b = revision 1
Copyright © 2004
Rev. 1.0, 2006-01-05
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet LX1800.PDF ] | |
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