Rainbow-electronics MAX8720 Manual de usuario descargar pdf (Pagina 19)

SMPS is active, initiating a transition to a new output

voltage level. If this mode of DAC control is used, con-

nect SUS low. Change D0–D5 together, avoiding

greater than 50ns skew between bits. Otherwise, incor-

rect DAC readings may cause a partial transition to the

wrong voltage level, followed by the intended transition

to the correct voltage level, lengthening the overall tran-

sition time. The available DAC codes and resulting out-

put voltages are shown in Table 4.

Suspend Mode (S0, S1, SUS)

When the CPU enters low-power suspend mode, the

processor sets the regulator to a lower output voltage

to reduce power consumption. The MAX8720 includes

a suspend-mode input (S0, S1) and a digital SUS con-

trol input. The suspend voltage is programmed using

the 4-level S0, S1 inputs (Table 5). The suspend volt-

age adjustment range is from 0.275V to 0.650V.

MAX8720

Dynamically Adjustable 6-Bit VID

Step-Down Controller

______________________________________________________________________________________ 19

D5 D4 D3 D2 D1 D0 V

OUT

D5 D4 D3 D2 D1 D0

OUT

0000001.850 1 0 0 0 0 0 1.050

0000011.825 1 0 0 0 0 1 1.025

0000101.800 1 0 0 0 1 0 1.000

0000111.775 1 0 0 0 1 1 0.975

0001001.750 1 0 0 1 0 0 0.950

0001011.725 1 0 0 1 0 1 0.925

0001101.700 1 0 0 1 1 0 0.900

0001111.675 1 0 0 1 1 1 0.875

0010001.650 1 0 1 0 0 0 0.850

0010011.625 1 0 1 0 0 1 0.825

0010101.600 1 0 1 0 1 0 0.800

0010111.575 1 0 1 0 1 1 0.775

0011001.550 1 0 1 1 0 0 0.750

0011011.525 1 0 1 1 0 1 0.725

0011101.500 1 0 1 1 1 0 0.700

0011111.475 1 0 1 1 1 1 0.675

0100001.450 1 1 0 0 0 0 0.650

0100011.425 1 1 0 0 0 1 0.625

0100101.400 1 1 0 0 1 0 0.600

0100111.375 1 1 0 0 1 1 0.575

0101001.350 1 1 0 1 0 0 0.550

0101011.325 1 1 0 1 0 1 0.525

0101101.300 1 1 0 1 1 0 0.500

0101111.275 1 1 0 1 1 1 0.475

0110001.250 1 1 1 0 0 0 0.450

0110011.225 1 1 1 0 0 1 0.425

0110101.200 1 1 1 0 1 0 0.400

0110111.175 1 1 1 0 1 1 0.375

0111001.150 1 1 1 1 0 0 0.350

0111011.125 1 1 1 1 0 1 0.325

0111101.100 1 1 1 1 1 0 0.300

0111111.075 1 1 1 1 1 1 0.275

Table 4. Output Voltage vs. DAC Codes

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 30 31

Step-Down Controller 1

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