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X5043V14I-2.7 Datasheet(PDF) 6 Page - Intersil Corporation |
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X5043V14I-2.7 Datasheet(HTML) 6 Page - Intersil Corporation |
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6 / 21 page  6 FN8126.2 March 16, 2006 no microprocessor action, the watchdog timer control bits remain unchanged, even during total power failure. VCC Threshold Reset Procedure The X5043, X5045 are shipped with a standard VCC threshold (VTRIP) voltage. This value will not change over normal operating and storage conditions. However, in applications where the standard VTRIP is not exactly right, or if higher precision is needed in the VTRIP value, the X5043, X5045 threshold may be adjusted. The procedure is described below, and uses the application of a high voltage control signal. Setting the VTRIP Voltage This procedure is used to set the VTRIP to a higher voltage value. For example, if the current VTRIP is 4.4V and the new VTRIP is 4.6V, this procedure will directly make the change. If the new setting is to be lower than the current setting, then 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 WP pin to the programming voltage VP. Then send a WREN command, followed by a write of Data 00h to address 01h. CS going HIGH on the write operation initiates the VTRIP programming sequence. Bring WP LOW to complete the operation. Note: This operation also writes 00h to array address 01h. 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 something less than 1.7V. This procedure must be used to set the voltage to a lower value. To reset the VTRIP voltage, apply at least 3V 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 complete the operation. Note: This operation also writes 00h to array address 03h. 01 2 3 4 5 67 SCK SI CS 06h 01 2 3 4 5 67 8 9 10 12 13 14 15 8 Bits 01h 02h WP VP = 15-18V 00h WREN Write Address Data 11 FIGURE 1. SET VTRIP LEVEL SEQUENCE (VCC = DESIRED VTRIP VALUE.) X5043, X5045 |
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