Rainbow-electronics MAX1621 Instrukcja Użytkownika Pobierz pdf (Strona 8)

MAX1620/MAX1621

Digitally Adjustable LCD Bias Supplies

8 _______________________________________________________________________________________

External Transistor Drive, HighDHI1616

External Transistor Drive, LowDLO1515

Switching-Voltage Sense InputLX1414

Power GroundPGND1313

Analog GroundAGND1212

IC Input Supply, 3.0V to 5.5VV

1111

DAC Output Voltage

Logic-Level Shutdown Input (active-low)

System Management Bus Suspend-Mode Input (active-low)

Power OK Voltage-Sense Input, 1V threshold

Reference Voltage Output. Bypass REF with 0.1µF to AGND.

Logic-Level Input. POL selects output voltage polarity: high = positive boost,

low = negative boost.

Logic-Level Input. A rising edge on UP increases V

OUT

.UP = DN = high resets

the counter to mid-scale.

DOUT

System Management Bus Serial-Clock Input

Battery Voltage-Sense Input

System Management Bus Serial-Data Input and Open-Drain Output

Logic-Level Input. A rising edge on DN decreases V

OUT

.UP = DN = high resets

the counter to mid-scale.

FUNCTION

SHDN

—4

SUS

4—

POK55

REF66

POL77

UP—2

Feedback Voltage InputFB9

SCL2—

BATT33

SDA1—

Open-Drain Output. LCDON controls LCD with external PNP.LCDON

DN—1

MAX1621MAX1620

NAME

______________________________________________________________Pin Description

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 19 20

MAX1620/MAX1621 1

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