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TLV370X Datasheet(PDF) 9 Page - Burr-Brown (TI) |
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TLV370X Datasheet(HTML) 9 Page - Burr-Brown (TI) |
9 / 13 page TLV3011, TLV3012 SBOS300B 9 www.ti.com FIGURE 4. The TLV3011 or TLV3012 Configured as a Power Up Reset Circuit for the MSP430. POWER-ON RESET The reset circuit shown in Figure 4 provides a time delayed release of reset to the MSP430 microcontroller. Operation of the circuit is based on a stabilization time constant of the supply voltage, rather than on a predetermined voltage value. The negative input is a reference voltage created by the internal voltage reference. The positive input is an RC circuit that provides a power-up delay. When power is ap- plied, the output of the comparator is low, holding the processor in the reset condition. Only after allowing time for the supply voltage to stabilize does the positive input of the comparator become higher than the negative input, resulting in a high output state, releasing the processor for operation. The stabilization time required for the supply voltage is adjustable by the selection of the RC component values. Use of a lower-valued resistor in this portion of the circuit will not increase current consumption because no current flows through the RC circuit after the supply has stabilized. FIGURE 5. TLV3012 Configured as a Relaxation Oscillator. V+ TLV301x C 1 10nF DI R 1 1M Ω R PULL-UP (1) 10k Ω RESET MSP430 1.242V REF NOTE: (1) Use R PULL-UP with the TLV3011 only. The reset delay needed depends on the power-up character- istics of the system power supply. R1 and C1 are selected to allow enough time for the power supply to stabilize. D1 provides rapid reset if power is lost. In this example, the R1 • C1 time constant is 10mS. RELAXATION OSCILLATOR The TLV3012 can be configured as a relaxation oscillator as in Figure 5 to provide a simple and inexpensive clock output. The capacitor is charged at a rate of T = 0.69RC. It also discharges at a rate of 0.69RC. Therefore, the period is T = 1.38RC. R1 may be a different value than R2. V+ F = 724Hz V+ 2/3 (V+) 1/3 (V+) R 2 1M Ω R 1 1M Ω R 2 1M Ω R 2 1M Ω V OUT V C V+ t C 1000pF T 1 T 2 t TLV3012 |
Similar Part No. - TLV370X |
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Similar Description - TLV370X |
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