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MSP430X43X1 Datasheet(PDF) 41 Page - Texas Instruments |
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MSP430X43X1 Datasheet(HTML) 41 Page - Texas Instruments |
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41 / 73 page  MSP430x43x1, MSP430x43x, MSP430x44x MIXED SIGNAL MICROCONTROLLER SLAS344F − JANUARY 2002 − REVISED MAY 2007 41 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 electrical characteristics over recommended operating free-air temperature (unless otherwise noted) (continued) POR/brownout reset (BOR) (see Note 1) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT td(BOR) 2000 μs VCC(start) dVCC/dt ≤ 3 V/s (see Figure 10) 0.7 × V(B_IT−) V V(B_IT−) Brownout dVCC/dt ≤ 3 V/s (see Figure 10 through Figure 12) 1.71 V Vhys(B_IT−) (see Note 2) dVCC/dt ≤ 3 V/s (see Figure 10) 70 130 180 mV t(reset) Pulse length needed at RST/NMI pin to accepted reset internally, VCC = 2.2 V/3 V 2 μs NOTES: 1. The current consumption of the brownout module is already included in the ICC current consumption data. The voltage level V(B_IT−) + Vhys(B_IT−) is ≤ 1.8V. 2. During power up, the CPU begins code execution following a period of td(BOR) after VCC = V(B_IT−) + Vhys(B_IT−). The default FLL+ settings must not be changed until VCC ≥ VCC(min), where VCC(min) is the minimum supply voltage for the desired operating frequency. See the MSP430x4xx Family User’s Guide (SLAU056) for more information on the brownout/SVS circuit. typical characteristics 0 1 t d(BOR) VCC V(B_IT−) Vhys(B_IT−) VCC(start) Figure 10. POR/Brownout Reset (BOR) vs Supply Voltage VCC(drop) VCC 3 V t pw 0 0.5 1 1.5 2 0.001 1 1000 Typical Conditions 1 ns 1 ns tpw − Pulse Width − μstpw − Pulse Width − μs VCC = 3 V Figure 11. VCC(drop) Level With a Square Voltage Drop to Generate a POR/Brownout Signal |
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