MSP430F449IPZ datasheet(45/79 Pages) TI

45 / 79 page

MSP430x43x1, MSP430x43x, MSP430x44x1, MSP430x44x

MIXED SIGNAL MICROCONTROLLER

SLAS344G − JANUARY 2002 − REVISED OCTOBER 2009

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(B_IT−)

Brownout

dVCC/dt ≤ 3 V/s (see Figure 10 through Figure 12)

1.71

Vhys(B_IT−)

(see Note 2)

dVCC/dt ≤ 3 V/s (see Figure 10)

130

180

t(reset)

Pulse length needed at RST/NMI pin to accepted reset internally,

VCC = 2.2 V/3 V

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

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

0.5

1.5

0.001

1000

Typical Conditions

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

MSP430F449IPZ Datasheet(PDF) 45 Page - Texas Instruments

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