DS1851 Dallas Semiconducotr, DS1851 Datasheet - Page 6

• Manufacturer Part Number: DS1851
• Description: Dual Temperature-Controlled NV Digital-to-Analog Converters
• Manufacturer: Dallas Semiconducotr

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Memory Location Name of Location
63h
64h
65h to 6Fh
70h
71h
72h to 7Fh
80h to A7h
DAC OPERATION
One DAC performs an 8-bit analog conversion using the difference between V
The output values follow the following equation:
DACreg1 is the decimal equivalent of the digital value to be converted to analog.
The other DAC performs an 8-bit analog conversion using the difference between V
reference. The output values follow the following equation:
DACreg2 is the decimal equivalent of the digital value to be converted to analog.
4
Temperature LSB
Address Pointer
User Memory
User Memory
User-Defined Look-Up Table
DAC-V Setting
DAC-G Setting
OutG = V
OutV = V
rg
rc
- (V
+ (V
rg
CC
– GND) * DACreg2/255
6 of 17
– V
rc
Function of Location
This byte contains the LSB of the 12-bit 2’s
complement temperature output from the
temperature sensor.
Calculated, current DAC address (80h–A7h).
The user-defined DAC setting at this location in
the respective look-up table will be loaded into
70h and 71h to set the two DACs.
General-purpose user memory
In the user-controlled setting mode, this block
contains the DAC-V setting.
In the user-controlled setting mode, this block
contains the DAC-G setting.
General-purpose user memory
This block contains the user-defined temperature
settings of the DACs. Values between 00h and
FFh can be written to either table to set the 8-bit
DACs. The first address location, 80h, is used to
set the DAC at -40°C. Each successive memory
location will contain the DAC setting for the
previous temperature +4°C. For example,
memory address 81h is the address that will set
the DAC in a -36°C environment.
) * DACreg1/255
2
-1
2
-2
2
-3
2
-4
rc
X X X X
and V
rg
and GND as the
CC
as the reference.
DS1851