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X40020V14-A Datasheet(PDF) 5 Page - Intersil Corporation |
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X40020V14-A Datasheet(HTML) 5 Page - Intersil Corporation |
5 / 24 page 5 FN8112.0 March 28, 2005 Figure 3. VTRIPX Set/Reset Conditions Figure 4. Watchdog Restart V1 AND V2 THRESHOLD PROGRAM PROCEDURE (OPTIONAL) The X40020/21 is shipped with standard V1 and V2 threshold (VTRIP1, VTRIP2) voltages. These values will not change over normal operating and storage conditions. However, in applications where the standard thresholds are not exactly right, or if higher precision is needed in the threshold value, the X40020 trip points may be adjusted. The procedure is described below, and uses the application of a high voltage control signal. Setting a VTRIPx Voltage (x = 1, 2) There are two procedures used to set the threshold volt- ages (VTRIPx), depending if the threshold voltage to be stored is higher or lower than the present value. For example, if the present VTRIPx is 2.9 V and the new VTRIPx is 3.2 V, the new voltage can be stored directly into the VTRIPx cell. If however, the new setting is to be lower than the present setting, then it is necessary to “reset” the VTRIPx voltage before setting the new value. Setting a Higher VTRIPx Voltage (x = 1, 2) To set a VTRIPx threshold to a new voltage which is higher than the present threshold, the user must apply the desired VTRIPx threshold voltage to the corresponding input pin (Vcc(V1MON) or V2MON). Then, a program-ming voltage (Vp) must be applied to the WDO 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 VTRIP1, and 09h for VTRIP2, and a 00h Data Byte in order to program VTRIPx. The STOP bit following a valid write operation initiates the programming sequence. Pin WDO must then be brought LOW to complete the operation. To check if the VTRIPX has been set, set VXMON to a value slightly greater than VTRIPX (that was previously set). Slowly ramp down VXMON and observe when the corresponding outputs (LOWLINE and V2FAIL) switch. The voltage at which this occurs is the VTRIPX (actual). CASE A Now if the desired VTRIPX is greater than the VTRIPX (actual), then add the difference between VTRIPX (desired) - VTRIPX (actual) to the original VTRIPX desired. This is your new VTRIPX that should be applied to VXMON and the whole sequence should be repeated again (see Figure 5). CASE B Now if the VTRIPX (actual), is higher than the VTRIPX (desired), perform the reset sequence as described in the next section. The new VTRIPX voltage to be applied to VXMON will now be: VTRIPX (desired) - (VTRIPX (actual) - VTRIPX (desired)). Note: 1. This operation does not corrupt the memory array. 2. Set VCC = 5V, when VTRIP2 is being pro- grammed Setting a Lower VTRIPx Voltage (x = 1, 2) In order to set VTRIPx to a lower voltage than the present value, then VTRIPx must first be “reset” accord- ing to the procedure described below. Once VTRIPx has been “reset”, then VTRIPx can be set to the desired voltage using the procedure described in “Setting a Higher VTRIPx Voltage”. VCC/V2MON VTRIPX VP tWC A0h 0 7 70 7 0 SCL WDO SDA (X = 1, 2) 00h SCL SDA .6µs 1.3µs WDT Reset Start Stop X40020, 40021 |
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