NJU6051V データシートの表示（PDF） - Japan Radio Corporation

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NJU6051V

White LED Driver with Automatic Dimming Control

Japan Radio Corporation  

NJU6051

And, the formula (3) gives the PWM frequency.

f pwm

=

1

64

⋅

2

f osc

(3+ N

)

(Hz) --- Formula (3)

TABLE 7 PWM FREQUENCY

DIVIDE

N

00

0

01

1

10

2

11

3

100kHz

195.3

97.7

48.8

24.4

200kHz

390.6

195.3

97.7

48.8

FOSC

400kHz

781.3

390.6

195.3

97.7

800kHz

1562.5

781.3

390.6

195.3

UNIT : Hz

NOTE) PWM frequencies written in bold or neighbors are recommended, otherwise it might cause LED flickering.

(6) LEVEL SHIFTER

The level shifter allows the communication with the MPU working at the power supply voltage lower than the

VDD. Apply the MPU power-supply-voltage on the VDDL terminal. The voltage range is: 1.8V<VDDL<3.6V .

(7) RESET

By setting the RSTB pin to “L”, the NJU6051 is initialized into the following default status.

TABLE 8 RESET

REGISTER

REV

HOLD

STBY

BRIGHT

SOFF

DIVIDE

PWM REGISTER1-7

DATA

0

0

0

000

0

00

000000

Default status

Refer to Table 5

Sensor sampling is enabled

Standby Off

Luminance sensor control is enabled

PWM duty 0% (LED off)

(8) TEMPERATURE COMPENSATION

The reference voltage (VREF) generator has temperature compensation, which suppresses the characteristic

degradation of LEDs at high temperatures. Refer to “ILED vs. Temperature” shown in the “DC Electrical

Characteristics”.

- 10 -

Ver.2003-10-23

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