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X4045P-2.7 Datasheet(PDF) 6 Page - Intersil Corporation |
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X4045P-2.7 Datasheet(HTML) 6 Page - Intersil Corporation |
6 / 24 page 6 FN8118.1 September 30, 2005 Setting a VTRIP Voltage There are two procedures used to set the threshold voltages (VTRIP), depending if the threshold voltage to be stored is higher or lower than the present value. For example, if the present VTRIP is 2.9 V and the new VTRIP is 3.2 V, the new voltage can be stored directly into the VTRIP cell. If however, the new setting is to be lower than the present setting, then it is necessary to “reset” the VTRIP voltage before setting the new value. Setting a Higher VTRIP Voltage To set a VTRIP threshold to a new voltage which is higher than the present threshold, the user must apply the desired VTRIP threshold voltage to the VCC. Then, a programming voltage (Vp) must be applied to the WP pin before a START condition is set up on SDA. Next, issue on the SDA pin the Slave Address A0h, followed by the Byte Address 01h for VTRIP and a 00h Data Byte in order to program VTRIP . The STOP bit following a valid write operation initiates the program- ming sequence. WP pin must then be brought LOW to complete the operation. To check if the VTRIP has been set, first power-down the device. Slowly ramp up VCC and observe when the output, RESET (4043) or RESET (4045) switches. The voltage at which this occurs is the VTRIP (actual) (see Figure 2). CASE A Now if the desired VTRIP is greater than the VTRIP (actual), then add the difference between VTRIP (desired) - VTRIP (actual) to the original VTRIP desired. This is your new VTRIP that should be applied to VCC and the whole sequence should be repeated again (see Figure 5). CASE B Now if the VTRIP (actual), is higher than the VTRIP (desired), perform the reset sequence as described in the next section. The new VTRIP voltage to be applied to VCC will now be: VTRIP (desired) - (VTRIP (actual)-VTRIP (desired)). Note: This operation does not corrupt the memory array. Setting a Lower VTRIP Voltage In order to set VTRIP to a lower voltage than the present value, then VTRIP must first be “reset” accord- ing to the procedure described below. Once VTRIP has been “reset”, then VTRIP can be set to the desired volt- age using the procedure described in “Setting a Higher VTRIP Voltage”. Resetting the VTRIP Voltage To reset a VTRIP voltage, apply the programming volt- age (Vp) to the WP pin before a START condition is set up on SDA. Next, issue on the SDA pin the Slave Address A0h followed by the Byte Address 03h fol- lowed by 00h for the Data Byte in order to reset VTRIP. The STOP bit following a valid write operation initiates the programming sequence. Pin WP must then be brought LOW to complete the operation. After being reset, the value of VTRIP becomes a nomi- nal value of 1.7V or lesser. Note: This operation does not corrupt the memory array. X4043, X4045 |
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