x96011 Intersil Corporation, x96011 Datasheet - Page 15

• Manufacturer Part Number: x96011
• Description: Temperature Sensor With Look Up Table Memory And Dac
• Manufacturer: Intersil Corporation

By examining the block diagram in Figure 5, we see
that the maximum current through pin Iout is set by fix-
ing values for V(VRef) and R. The output current can
then be varied by changing the data byte at the D/A
converter input.
In general, the magnitude of the current at the D/A
converter output pin may be calculated by:
where N is the decimal representation of the input byte
to the corresponding D/A converter.
The value for the resistor determines the full scale out-
put current that the D/A converter may sink or source.
Bits IFSO1 and IFSO0 select the full scale output cur-
rent setting for Iout as described in “IFSO1 - IFSO0:
Current Generator Full Scale Output Set Bits (Non-vol-
atile)” on page 12.
Bit IDS and in Control Register 0 select the direction of
the currents through pins Iout (See “IDS: Current Gen-
erator Direction Select Bit (Non-volatile)” on page 10
and “Control and Status Register Format” on
page 11).
Figure 7. Look-Up Table Addressing
Voltage Input
from Internal
temperature
I = (V(VRef) / (384 • R)) • N
sensor
Reference
Voltage
15
ADC
Register
AD[7:0]
Status
8
6
X96011
D/A Converter Output Current Response
When the D/A converter input data byte changes by
an arbitrary number of bits, the output current changes
from an intial current level (I
(I
D/A Converter Control
The data byte inputs of the D/A converters can be con-
trolled in three ways:
– 1) With the A/D converter and through the look-up
– 2) Bypassing the A/D converter and directly access-
– 3) Bypassing both the A/D converter and look-up
x
tables (default),
ing the look-up tables,
tables, and directly setting the D/A converter input
byte.
+ ∆I
Register 1
LDA[5:0]:
Control
x
). The transition is monotonic and glitchless.
6
D1
D0
Control register 5
Select
LDAS: bit 4 in
Out
Selection bits
LUT Row
x
) to some final level
October 25, 2005
FN8215.1