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X5083 Datasheet(PDF) 4 Page - Xicor Inc. |
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X5083 Datasheet(HTML) 4 Page - Xicor Inc. |
4 / 21 page X5083 Characteristics subject to change without notice. 4 of 21 REV 1.1.6 6/25/02 www.xicor.com 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, apply the desired VTRIP threshold voltage to the Vcc pin and tie the WP pin to the programming voltage VP. Then send a WREN command, followed by a write of data 00h to address 03h. CS going HIGH on the write operation initiates the VTRIP programming sequence. Bring WP LOW to com- plete the operation. Note: This operation also writes 00h to array address 03h. Figure 2. Reset VTRIP Level Sequence (VCC > 3V. WP = 15–18V) Figure 3. Sample VTRIP Reset Circuit 012 345 67 SCK SI CS 06h 012 345 67 89 10 20 21 22 23 16 Bits 0003h 02h WP VP = 15-18V 00h WREN Write Address Data 1 2 3 4 8 7 6 5 X5083 VTRIP Adj. VP RESET 4.7K SI SO CS SCK µC Adjust Run |
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