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LTC2939HMS Datasheet(PDF) 11 Page - Linear Technology |
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LTC2939HMS Datasheet(HTML) 11 Page - Linear Technology |
11 / 20 page LTC2938/LTC2939 11 293839ff APPLICATIONS INFORMATION A less accurate supervisor increases the required system voltage margin and increases the probability of system malfunction. The LTC2938 and LTC2939 ±1.5% specifica- tion improves the reliability of the system over supervisors with wider threshold tolerances. Monitor Configuration Select the LTC2938/LTC2939 input voltage combination by placing the recommended resistive divider from VREF to GND and connect the tap point to VPG, as shown in Figure 2. Table 1 offers recommended 1% resistor values for the various modes. The rightmost column in Table 1 specifies optimum VPG/VREF ratios (±0.01), when configuring with a ratiometric DAC. Table 1. Voltage Threshold Modes MODE V1 (V) V2 (V) V3 (V) V4 (V) R1 (kΩ) R2 (kΩ) VPG/VREF 0 5 3.3 ADJ ADJ Open Short 0 1 5 3.3 ADJ –ADJ 93.1 9.53 0.094 2 3.3 2.5 ADJ ADJ 86.6 16.2 0.156 3 3.3 2.5 ADJ –ADJ 78.7 22.1 0.219 4 3.3 1.8 1.5 ADJ 71.5 28 0.281 5 5 3.3 2.5 ADJ 66.5 34.8 0.344 6 5 3.3 2.5 1.8 59 40.2 0.406 7 3.3 1.8 1.5 1.2 53.6 47.5 0.469 8 3.3 1.8 1.2 ADJ 47.5 53.6 0.531 9 3.3 1.8 ADJ ADJ 40.2 59 0.594 10 3.3 2.5 1.8 1.5 34.8 66.5 0.656 11 3.3 2.5 1.8 ADJ 28 71.5 0.719 12 3.3 1.8 ADJ –ADJ 22.1 78.7 0.781 13 3.3 1.5 ADJ ADJ 16.2 86.6 0.844 14 5 3.3 1.8 ADJ 9.53 93.1 0.906 15 3.3 1.2 ADJ ADJ Short Open 1 Upon power-up, the LTC2938 or LTC2939 enters a con- figuration period of approximately 150μs during which the voltage on the VPG input is sampled and the monitor is configured to the desired input combination. Do not add capacitance to the VPG input. Immediately after programming, the comparators are enabled and supply monitoring begins. Figure 2. Monitor Programming R1 1% R2 1% 293839 F02 VREF VPG GND LTC2938/ LTC2939 |
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