ADM8843ACPZ-REEL7 데이터 시트보기 (PDF) - Analog Devices

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ADM8843ACPZ-REEL7

Four White LED Backlight Driver

Analog Devices 

Data Sheet

ADM8843

Table 7. Digital Inputs Truth Table

CTRL1

CTRL2

LED Operation

0

0

Sub display off/main display off (full shutdown)1, 2

0

1

Sub display off/main display on1, 3

1

0

Sub display on/main display off1, 2

1

1

Sub display on/main display on (full on)1, 3

0

PWM

Sub display off/digital PWM brightness control on main display4, 5

PWM

0

Digital PWM brightness control on sub display/main display off2, 4

1

PWM

Sub display on/digital PWM brightness control on main display1, 5

PWM

1

Digital PWM brightness control on sub display/main display on5

PWM

PWM

Digital PWM brightness control on sub and main display5

1 Sub display on means the display is on with the maximum brightness set by the RSET resistor. CTRL1 = 1 means a constant logic level (VCC) is applied to CTRL1.

2 Main display off means only the main display is off. CTRL2 = 0 means a constant logic level (GND) is applied to CTRL2.

3 Main display on means the display is on with the maximum brightness set by the RSET resistor. CTRL2 = 1 means a constant logic level (VCC) is applied to CTRL2.

4 Sub display off means only the sub display LEDs is off. CTRL1 = 0 means a constant logic level (GND) is applied to CTRL1.

5 PWM means a digital PWM signal is applied to the CTRL1 and/or the CTRL2 pin with a frequency from 100 Hz to 200 kHz.

LED CONFIG.

FULL ON

CTRL1

CTRL2

VOUT

ILED

(SUB)

ILED

(MAIN)

SUB DISPLAY

BRIGHTNESS

MAIN DISPLAY

BRIGHTNESS

100%

100%

SUB AND MAIN 50%

DUTY CYCLE

MAIN AND SUB OFF

tCP

50%

50%

SHDN

SHDN

37ms > tCP > 15ms

Figure 20. Application Timing

MAIN 80% DUTY CYCLE,

SUB OFF

80%

Rev. E | Page 11 of 16

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