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X9110 Datasheet(PDF) 5 Page - Xicor Inc. |
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X9110 Datasheet(HTML) 5 Page - Xicor Inc. |
5 / 21 page X9110 – Preliminary Information Characteristics subject to change without notice. 5 of 21 REV 1.1.4 11/13/00 www.xicor.com Figure 1. Detailed Potentiometer Block Diagram Serial Data Path From Interface Register 0 Serial Bus Input Parallel Bus Input Counter Register RH RL R W 10 10 C O U N T E R D E C O D E If WCR = 000[HEX] then RW = RL If WCR = 3FF[HEX] then RW = RH Wiper (WCR) (DR0) Circuitry Register 1 (DR1) Register 2 (DR2) Register 3 (DR3) These switches are controlled by a Wiper Counter Register (WCR). The 10-bits of the WCR (WCR[9:0]) are decoded to select, and enable, one of 1024 switches. Wiper Counter Register (WCR) The X9110 contains a Wiper Counter Register (see Table 1) for the XDCP potentiometer. The WCR is equivalent to a serial-in, parallel-out register/counter with its outputs decoded to select one of 1024 switches along its resistor array. The contents of the WCR can be altered in one of three ways: (1) it may be written directly by the host via the write Wiper Counter Register instruction (serial load); (2) it may be written indirectly by transferring the contents of one of four associated Data Registers via the XFR Data Register; (3) it is loaded with the contents of its data register zero (DR0) upon power-up. The Wiper Counter Register is a volatile register; that is, its contents are lost when the X9110 is powered- down. Although the register is automatically loaded with the value in DR0 upon power-up, this may be different from the value present at power-down. Power- up guidelines are recommended to ensure proper loadings of the DR0 value into the WCR. Data Registers (DR) The potentiometer has four 10-bit non-volatile Data Registers. These can be read or written directly by the host. Data can also be transferred between any of the four Data Registers and the Wiper Counter Register. All operations changing data in one of the Data Registers is a nonvolatile operation and will take a maximum of 10ms. If the application does not require storage of multiple settings for the potentiometer, the Data Registers can be used as regular memory locations for system parameters or user preference data. DR[9:0] is used to store one of the 1024 wiper position (0 ~1023). Table 2. Status Register (SR) This 1-bit status register is used to store the system status (see Table 3). WIP: Write In Progress status bit, read only. – When WIP=1, indicates that high-voltage write cycle is in progress. – When WIP=0, indicates that no high-voltage write cycle is in progress. |
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