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X9251UB24-2.7 Datasheet(PDF) 5 Page - Xicor Inc. |
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X9251UB24-2.7 Datasheet(HTML) 5 Page - Xicor Inc. |
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5 / 25 page  X9251 Characteristics subject to change without notice. 5 of 25 REV 1.3.3 2/10/04 www.xicor.com PIN DESCRIPTIONS Bus Interface Pins SERIAL OUTPUT (SO) SO is a serial data output pin. During a read cycle, data is shifted out on this pin. Data is clocked out by the falling edge of the serial clock. SERIAL INPUT (SI) SI is the serial data input pin. All opcodes, byte addresses and data to be written to the device registers are input on this pin. Data is latched by the rising edge of the serial clock. SERIAL CLOCK (SCK) The SCK input is used to clock data into and out of the X9251. HOLD (HOLD) HOLD is used in conjunction with the CS pin to select the device. Once the part is selected and a serial sequence is underway, HOLD may be used to pause the serial communication with the controller without resetting the serial sequence. To pause, HOLD must be brought LOW while SCK is LOW. To resume communication, HOLD is brought HIGH, again while SCK is LOW. If the pause feature is not used, HOLD should be held HIGH at all times. DEVICE ADDRESS (A1–A0) The address inputs are used to set the two least significant bits of the slave address. A match in the slave address serial data stream must be made with the address input in order to initiate communication with the X9251. Device pins A1-A0 must be tie to a logic level which specify the internal address of the device, see Figures 2, 3, 4, 5 and 6. CHIP SELECT (CS) When CS is HIGH, the X9251 is deselected and the SO pin is at high impedance, and (unless an internal write cycle is underway) the device is in the standby state. CS LOW enables the X9251, placing it in the active power mode. It should be noted that after a power-up, a HIGH to LOW transition on CS is required prior to the start of any operation. Potentiometer Pins RH, RL The RH and RL pins are equivalent to the terminal connections on a mechanical potentiometer. Since there are 4 potentiometers, there are 4 sets of RH and RL such that RH0 and RL0 are the terminals of DCP0 and so on. RW The wiper pin are equivalent to the wiper terminal of a mechanical potentiometer. Since there are 4 potentiometers, there are 4 sets of RW such that RW0 is the terminals of DCP0 and so on. Supply Pins SYSTEM SUPPLY VOLTAGE (VCC) AND SUPPLY GROUND (VSS) The VCC pin is the system supply voltage. The VSS pin is the system ground. Other Pins NO CONNECT No connect pins should be left floating. This pins are used for Xicor manufacturing and testing purposes. HARDWARE WRITE PROTECT INPUT (WP) The WP pin when LOW prevents non-volatile writes to the Data Registers. |
Similar Part No. - X9251UB24-2.7 |
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Similar Description - X9251UB24-2.7 |
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