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DS3503U+ Datasheet(PDF) 6 Page - Maxim Integrated Products |
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DS3503U+ Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 12 page NV, I2C, Stepper Potentiometer 6 _______________________________________________________________________________________ Detailed Description The DS3503 contains two potentiometers whose out- puts can be stepped up and down by configuring the control registers. One potentiometer, with output RW, is controlled by the Initial Value Register/Wiper Register (IVR/WR). The other potentiometer is fixed at setting 40h, and its output is on the Y pin. By using the config- uration registers and the SYNC pin, the outputs from these two potentiometers can be stepped up and down. Digital Potentiometers The RW potentiometer consists of 127 resistors in series connected between the RH and RL pins. Between each resistance and at the two end points, RH and RL, solid-state switches enable RW to be connect- ed within the resistive network. The wiper position and the output on RW are decoded based on the value in WR. If RH, RL, and RW are externally connected in a voltage-divider configuration, the voltage on RW can be easily calculated using the following equation: Where WR is the wiper position in decimal (0–127). The factory default setting for this potentiometer is 40h. The Y potentiometer is also referenced to the RH and RL terminals, but is centered at a 40h setting. Memory Map The DS3503 contains three registers for controlling the outputs of the two potentiometers, pins RW and Y. Table 1 shows the memory map. IVR/WR is accessed at register address 00h and contains the power-on and current values of the RW potentiometer. The Step Control Register (SCR) controls the stepping function for both potentiometers. The Control Register (CR) con- trols the write functionality of the IVR/WR. Initial Value Register/Wiper Register (IVR/WR) Programming IVR sets the initial power-up value of the RW wiper position. IVR/WR can be visualized as a volatile register (WR) in parallel with a nonvolatile regis- ter (IVR). On power-up, the data stored in IVR is loaded into WR, which sets the position of the potentiometer’s wiper. The factory default value for IVR is 40h. See the Stepping section for information about clamping. VV WR VV RW RL RH RL =+ × − 127 () NAME ADDRESS (HEX) ACCESS NONVOLATILE VOLATILE IVR/WR 00h R/W Initial Value Register (IVR), factory setting = 40h Wiper Register (WR) SCR 01h R/W Step Control Register, factory setting = 00h — CR 02h R/W Control Register — Soft-POR AAh R/W — Soft Power-On Reset Register Table 1. Memory Map |
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