Rainbow-electronics MAX6948B Manual do Utilizador descarregar pdf (Página 3)

High-Efficiency PWM LED Driver with Boost

Converter and Five Constant-Current GPIO Ports

3

MAX6948B

ELECTRICAL CHARACTERISTICS (continued)

(Typical Application Circuit, V+ = 2.7V to 5.0V, V

DD

= 1.7V to V+, T

A

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at

V+ = 3.3V, V

DD

= 2.5V, T

A

= +25NC.) (Note 4)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Change in Supply Current per

30mA Port

DI

DD30

One port set to

30mA constant cur-

rent; all other ports

are digital inputs at

V

DD

or GND

T

A

= +25NC 3 6.2

mA

T

A

= T

MIN

to T

MAX

7

Change in Supply Current per

10mA Port

DI

DD10

One port set to 5mA

constant current

half-current setting;

all other ports are

digital inputs at V

DD

or GND

T

A

= +25NC 1.3 1.7

mA

T

A

= T

MIN

to T

MAX

2

GPIO PORTS (P0–P4)

Input High Voltage V

IH1

Port I/O register value set to 0x01

(0.7 x

V

DD

)

V

Input Low Voltage V

IL1

Port I/O register value set to 0x01

(0.3 x

V

DD

)

V

Input Leakage Current I

IN

±0.03 Q1 FA

Input Capacitance 10 pF

30mA Port Sink Constant Current

(P0, P1)

I

PORT30

Port I/O register

value set to 0x02,

V+ = 3.3V, V

EXT

-

V

LED

= 0.5V to 1.5V

(Note 5)

T

A

= +25NC 27 30 34

mA

T

A

= T

MIN

to T

MAX

25 35

10mA Port Sink Constant Current

(P2, P3, P4)

I

PORT10

5mA half-current

setting, port I/O

register value set

to 0x02, V+ = 3.3V,

V

EXT

- V

LED

= 0.5V

to 1.5V (Note 5)

T

A

= +25NC 4.4 5 5.6

mA

T

A

= T

MIN

to T

MAX

3.7 6.3

Logic Output Low Voltage V

OL1

I

SINK

= 2mA, port I/O register value set to

0x00

0.17 0.3 V

30mA Port Sink Constant-Current

Matching (P0, P1)

DI

PORT30

Constant current set

to 30mA, V+ = 3.3V,

T

A

= +25NC (Note 6)

V

PORT

= 1V Q0.7 Q5

%

V

PORT

= 2.75V Q5

10mA Port Sink Constant-Current

Matching (P2, P3, P4)

DI

PORT10

Constant current set

to 5mA half-current

setting, V+ = 3.3V,

T

A

= +25NC (Note 6)

V

PORT

= 1V Q2 Q5 %

Constant-Current Slew Time

20% current to 80% current, port I/O regis-

ter value changed from 0x01 to 0x02

2 Fs

1 2 3 4 5 6 7 8 ... 27 28

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