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X4645S8-2.7 Datasheet(PDF) 4 Page - Intersil Corporation |
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X4645S8-2.7 Datasheet(HTML) 4 Page - Intersil Corporation |
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4 / 21 page  4 FN8123.0 March 29, 2005 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 pro- gramming voltage, VP, to the WP pin and 2 byte address and 1 byte of “00” data. The stop bit of a valid write operation 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 01 2 3 45 67 SCL SDA A0h 01 2 3 45 67 00h WP VP = 12-15V 01 2 3 45 67 03h 01 2 3 4 5 6 7 00h 1 2 3 4 8 7 6 5 X4643 VTRIP Adj. VP RESET 4.7K SDA SCL µC Adjust Run SOIC X4643, X4645 |
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