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X4283S8-2.7 Datasheet(PDF) 4 Page - Xicor Inc. |
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X4283S8-2.7 Datasheet(HTML) 4 Page - Xicor Inc. |
4 / 22 page X4283/85 – Preliminary Information Characteristics subject to change without notice. 4 of 22 REV 1.17 11/27/00 www.xicor.com Setting the VTRIP Voltage This procedure is used to set the VTRIP to a higher or lower voltage value. It is necessary to reset the trip point before setting the new value. To set the new VTRIP voltage, start by setting the WEL bit in the control register, then apply the desired VTRIP threshold voltage to the VCC pin and the programming voltage, VP, to the WP pin and 2 byte address and 1 byte of “00” data. The stop bit following a valid write operation initiates the VTRIP programming sequence. Bring WP LOW to complete the operation. Resetting the VTRIP Voltage This procedure is used to set the VTRIP to a “native” voltage level. For example, if the current VTRIP is 4.4V and the new VTRIP must be 4.0V, then the VTRIP must be reset. When VTRIP is reset, the new VTRIP is some- thing less than 1.7V. This procedure must be used to set the voltage to a lower value. To reset the new VTRIP voltage start by setting the WEL bit in the control register, apply VCC and the program- ming voltage, VP, to the WP pin and 2 byte address and 1 byte of “00” data. The stop bit of a valid write opera- tion initiates the VTRIP programming sequence. Bring WP LOW to complete the operation. Figure 2. Reset VTRIP Level Sequence (VCC > 3V. WP = 12-15V, WEL bit set) Figure 3. Sample VTRIP Reset Circuit 012 345 67 SCL SDA A0h 012 345 67 00h WP VP = 12-15V 012 345 67 03h 012 345 6 7 00h 1 2 3 4 8 7 6 5 X4283 VTRIP Adj. VP RESET 4.7K SDA SCL µC Adjust Run SOIC |
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