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ISL22313WFU10Z Fiches technique(PDF) 11 Page - Intersil Corporation |
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ISL22313WFU10Z Fiches technique(HTML) 11 Page - Intersil Corporation |
11 / 15 page 11 FN6421.0 July 17, 2007 Device Address (A1, A0) The address inputs are used to set the least significant 2 bits of the 7-bit I2C interface slave address. A match in the slave address serial data stream must match with the Address input pins in order to initiate communication with the ISL22313. A maximum of four ISL22313 devices may occupy the I2C serial bus (see Table 3). Principles of Operation The ISL22313 is an integrated circuit incorporating one DCP with its associated registers, non-volatile memory and an I2C serial interface providing direct communication between a host and the potentiometer and memory. The resistor array is comprised of individual resistors connected in series. At either end of the array and between each resistor is an electronic switch that transfers the potential at that point to the wiper. The electronic switches on the device operate in a “make before break” mode when the wiper changes tap positions. When the device is powered down, the last value stored in IVR will be maintained in the non-volatile memory. When power is restored, the contents of the IVR are recalled and loaded into the WR to set the wiper to the initial value. DCP Description The DCP is implemented with a combination of resistor elements and CMOS switches. The physical ends of each DCP are equivalent to the fixed terminals of a mechanical potentiometer (RH and RL pins). The RW pin of the DCP is connected to intermediate nodes, and is equivalent to the wiper terminal of a mechanical potentiometer. The position of the wiper terminal within the DCP is controlled by an 8-bit volatile Wiper Register (WR). When the WR of a DCP contains all zeroes (WR[7:0]= 00h), its wiper terminal (RW) is closest to its “Low” terminal (RL). When the WR register of a DCP contains all ones (WR[7:0]= FFh), its wiper terminal (RW) is closest to its “High” terminal (RH). As the value of the WR increases from all zeroes (0) to all ones (255 decimal), the wiper moves monotonically from the position closest to RL to the position closest to RH. At the same time, the resistance between RW and RL increases monotonically, while the resistance between RH and RW decreases monotonically. While the ISL22313 is being powered up, the WR is reset to 80h (128 decimal), which locates RW roughly at the center between RL and RH. After the power supply voltage becomes large enough for reliable non-volatile memory reading, the WR will be reloaded with the value stored in a non-volatile Initial Value Register (IVR). The WR and IVR can be read or written to directly using the I2C serial interface as described in the following sections. Memory Description The ISL22313 contains one non-volatile 8-bit Initial Value Register (IVR), fourteen General Purpose non-volatile 8-bit registers and two volatile 8-bit registers: Wiper Register (WR) and Access Control Register (ACR). Memory map of ISL22313 is in Table 1. The non-volatile register (IVR) at address 0, contains initial wiper position and volatile register (WR) contains current wiper position. The non-volatile IVR and volatile WR registers are accessible with the same address. The Access Control Register (ACR) contains information and control bits described below in Table 2. The VOL bit (ACR[7]) determines whether the access to wiper registers WR or initial value registers IVR. If VOL bit is 0, the non-volatile IVR register is accessible. If VOL bit is 1, only the volatile WR is accessible. Note: Value is written to IVR register also is written to the WR. The default value of this bit is 0. The SHDN bit (ACR[6]) disables or enables Shutdown mode. When this bit is 0, i.e. DCP is forced to end-to-end open circuit and RW is shorted to RL as shown on Figure 15. Default value of the SHDN bit is 1. TABLE 1. MEMORY MAP ADDRESS (hex) NON-VOLATILE VOLATILE 10 N/A ACR FReserved E General Purpose N/A D General Purpose N/A C General Purpose N/A B General Purpose N/A A General Purpose N/A 9 General Purpose N/A 8 General Purpose N/A 7 General Purpose N/A 6 General Purpose N/A 5 General Purpose N/A 4 General Purpose N/A 3 General Purpose N/A 2 General Purpose N/A 1 General Purpose N/A 0IVR WR TABLE 2. ACCESS CONTROL REGISTER (ACR) BIT # 7 6 5 4 3 210 NAME VOL SHDN WIP 0 0 000 ISL22313 |
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Description similaire - ISL22313WFU10Z |
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