Figure 6. variable resistor configurations, Wiper resistanceconsiderations, Figure 8. potentiometer resistor model – Rainbow Electronics DS2890 User Manual
Page 8: The value of r
DS2890
8 of 28
Figure 6. Variable Resistor Configurations
(TO92 Package)
RH
WIPER
RL
VDD
1-WIRE
GND
2.8V to 6.0V
or
No Connect
2.8V to 6.0V
Bus
Master
RH
1-WIRE
GND
2.8V to 6.0V
Bus
Master
WIPER RESISTANCECONSIDERATIONS
A simplified diagram of the DS2890 resistor array for the potentiometer configuration is shown in
FIGURE 8. In this figure the
r
DS
resistance of the wiper transistors in Figure 1 are modeled as wiper
resistance R
WIPER
. The value of R
WIPER
varies with device configuration, operational state, and wiper
terminal voltage. Wiper resistance is significantly reduced when an external VDD supply is used and the
device charge pump is enabled. A wiper resistance graph with the charge pump enabled is shown in
FIGURE 10.
FIGURE 8. Potentiometer Resistor Model
RH
R
WIPER
RL
WIPER
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