ADM8843(Rev0) 查看數據表（PDF） - Analog Devices

零件编号

产品描述 (功能)

生产厂家

ADM8843
(Rev.:Rev0)

4 White LED Backlight Driver

Analog Devices 

ADM8843

Table 6. 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 the main display only 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 the sub display LEDs only 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. 0 | Page 11 of 16

Share Link: