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X1227S8I-2.7A 데이터시트(PDF) 9 Page - Xicor Inc. |
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X1227S8I-2.7A 데이터시트(HTML) 9 Page - Xicor Inc. |
9 / 28 page X1227 REV 1.1.20 1/13/03 Characteristics subject to change without notice. 9 of 28 www.xicor.com Figure 4. Power On Reset and Low Voltage Reset VCC VTRIP RESET tPURST tPURST tR tF tRPD VRVALID VCC THRESHOLD RESET PROCEDURE [OPTIONAL] The X1227 is shipped with a standard VCC threshold (VTRIP) voltage. This value will not change over normal operating and storage conditions. However, in applica- tions where the standard VTRIP is not exactly right, or if higher precision is needed in the VTRIP value, the X1227 threshold may be adjusted. The procedure is described below, and uses the application of a nonvol- atile write control signal. Setting the VTRIP Voltage It is necessary to reset the trip point before setting the new value. To set the new VTRIP voltage, apply the desired VTRIP threshold voltage to the VCC pin and tie the RESET pin to the programming voltage VP. Then write data 00h to address 01h. The stop bit following a valid write opera- tion initiates the VTRIP programming sequence. Bring RESET to VCC to complete the operation. Note: this operation may take up to 10 milliseconds to complete and also writes 00h to address 01h of the EEPROM array. Figure 5. Set VTRIP Level Sequence (VCC = desired VTRIP value) SCL SDA 01h RESET VP = 15V 00h 012 345 67 0 1 2 345 67 01 2 3 4 5 6 7 0 1 2 3 45 67 AEh 00h VCC VCC Note: BP0, BP1, BP2 must be disabled. 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 more than 5.5V to the VCC pin and tie the RESET pin to the programming voltage VP. Then write 00h to address 03h. The stop bit of a valid write operation initiates the VTRIP programming sequence. Bring RESET to VCC to complete the operation. Note: this operation takes up to 10 milliseconds to complete and also writes 00h to address 03h of the EEPROM array. For best accuracy in setting VTRIP, it is advised that the following sequence be used. 1.Program VTRIP as above. 2.Measure resulting VTRIP by measuring the VCC value where a RESET occurs. Calculate Delta = (Desired – Measured) VTRIP value. 3.Perform a VTRIP program using the following formula to set the voltage of the RESET pin: VRESET = (Desired Value – Delta) + 0.025V |
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