Rainbow Electronics DS2890 - Manual (Page 9)

DS2890
9 of 28
FIGURE 10. Typical Wiper Resistance vs Wiper Voltage at 25 o C,
Charge Pump ON
100
1000
0.1 5.5 11
Voltage Across Wiper (V)
Wiper
R
esistance (ohms)
When packaged in a 3-pin TO-92 or configured as a variable resistor, the DS2890 takes on a
configuration as shown in FIGURE 11, a simplified model is shown in Figure 12. As shown, the RL and
Wiper terminals and are connected to GND and the resistance between the RH terminal and GND is
varied. As described previously, the DS2890 charge pump must be turned off (default state) for operation
with the TO-92 package or when VDD is not applied. Wiper resistance for a configuration with the
charge pump disabled is shown in FIGURE 13.