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ADM8843
Table 6. Digital Inputs Truth Table
CTRL1
0
0
1
1
0
PWM
1
PWM
PWM
CTRL2
0
1
0
1
PWM
0
PWM
1
PWM
LED Operation
Sub display off/main display off (full shutdown) 1, 2
Sub display off/main display on 1, 3
Sub display on/main display off 1, 2
Sub display on/main display on (full on) 1, 3
Sub display off/digital PWM brightness control on main display 4, 5
Digital PWM brightness control on sub display/main display off 2, 4
Sub display on/digital PWM brightness control on main display 1, 5
Digital PWM brightness control on sub display/main display on 5
Digital PWM brightness control on sub and main display 5
1
2
3
4
5
Sub display on means the display is on with the maximum brightness set by the R SET resistor. CTRL1 = 1 means a constant logic level (V CC ) is applied to CTRL1.
Main display off means only the main display is off. CTRL2 = 0 means a constant logic level (GND) is applied to CTRL2.
Main display on means the display is on with the maximum brightness set by the R SET resistor. CTRL2 = 1 means a constant logic level (V CC ) is applied to CTRL2.
Sub display off means only the sub display LEDs is off. CTRL1 = 0 means a constant logic level (GND) is applied to CTRL1.
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
SUB AND MAIN 50%
DUTY CYCLE
MAIN AND SUB OFF
MAIN 80% DUTY CYCLE,
SUB OFF
t CP
CTRL1
CTRL2
V OUT
I LED
(SUB)
I LED
(MAIN)
100%
SUB DISPLAY
BRIGHTNESS
100%
50%
SHDN
MAIN DISPLAY
BRIGHTNESS
50%
37ms > t CP > 15ms
Figure 20. Application Timing
Rev. C | Page 11 of 16
SHDN
80%
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