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ADM1168 Datasheet(PDF) 11 Page - Analog Devices |
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ADM1168 Datasheet(HTML) 11 Page - Analog Devices |
11 / 28 page ADM1168 Rev. 0 | Page 11 of 28 INPUTS SUPPLY SUPERVISION The ADM1168 has eight programmable inputs. Four of these are dedicated supply fault detectors (SFDs). These dedicated inputs are called VH and VPx (VP1 to VP3) by default. The other four inputs are labeled VXx (VX1 to VX4) and have dual functionality. They can be used either as SFDs, with functionality similar to the VH and VPx, or as CMOS-/TTL-compatible logic inputs to the device. Therefore, the ADM1168 can have up to eight analog inputs, a minimum of four analog inputs and four digital inputs, or a combination thereof. If an input is used as an analog input, it cannot be used as a digital input. Therefore, a configuration requiring eight analog inputs has no available digital inputs. Table 6 shows the details of each input. PROGRAMMING THE SUPPLY FAULT DETECTORS The ADM1168 can have up to eight SFDs on its eight input channels. These highly programmable reset generators enable the supervision of up to eight supply voltages. The supplies can be as low as 0.573 V and as high as 14.4 V. The inputs can be configured to detect an undervoltage fault (the input voltage drops below a preprogrammed value), an overvoltage fault (the input voltage rises above a preprogrammed value), or an out-of- window fault (the input voltage is outside a preprogrammed range). The thresholds can be programmed to an 8-bit resolution in registers provided in the ADM1168. This translates to a voltage resolution that is dependent on the range selected. The resolution is given by Step Size = Threshold Range/255 Therefore, if the high range is selected on VH, the step size can be calculated as follows: (14.4 V − 6.0 V)/255 = 32.9 mV Table 5 lists the upper and lower limits of each available range, the bottom of each range (VB), and the range itself (VR). Table 5. Voltage Range Limits Voltage Range (V) VB (V) VR (V) 0.573 to 1.375 0.573 0.802 1.25 to 3.00 1.25 1.75 2.5 to 6.0 2.5 3.5 6.0 to 14.4 6.0 8.4 The threshold value required is given by VT = (VR × N)/255 + VB where: VT is the desired threshold voltage (undervoltage or overvoltage). VR is the voltage range. N is the decimal value of the 8-bit code. VB is the bottom of the range. Reversing the equation, the code for a desired threshold is given by N = 255 × (VT − VB)/VR For example, if the user wants to set a 5 V overvoltage threshold on VP1, the code to be programmed in the PS1OVTH register (as described in the AN-721 Application Note) is given by N = 255 × (5 − 2.5)/3.5 Therefore, N = 182 (1011 0110 or 0xB6). |
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