ADP5501 Analog Devices, ADP5501 Datasheet - Page 24

• Manufacturer Part Number: ADP5501
• Description: Programmable Current Backlight Driver with Ambient Light Sensor Input
• Manufacturer: Analog Devices

Specifications of ADP5501

• Vin Range: 2.7 to 5.5V
• Vout (v): 24 to 27
• Synchronous: No
• Package: 24-Lead LFCSP
• Led Configuration: Serial
• Topology: Inductive
• I2c Support: Yes
• Max Iout (ma): 30mA
• Brightness Control: I2C
• Switching Frequency: 1MHz
• Over Volt Protection (v): 24V

ADP5501
Table 21. Register 0x0E, Level 2 (Office) Comparator Hysteresis (L2_HYS)
Bit
6 to 0
Table 22. Register 0x0F, Level 3 (Dark) Comparator Trip Point (L3_TRIP)
Bit
6 to 0
Table 23. Register 0x10, Level 3 (Dark) Comparator Hysteresis (L3_HYS)
Bit
6 to 0
Table 24. Register 0x11, LED Control (LED_SINK_CONTROL)
Bit
7 to 4
3
2
1
0
Table 25. Register 0x12, LED On and Off Timers (LED_TIME)
Bit
7 to 6
5 to 4
3 to 2
1 to 0
Name
L2_HYS
Name
Name
Name
Name
L3_TRIP
L3_HYS
Not used
LED_LAW
LED2_EN
LED1_EN
LED0_EN
LED_ONT
LED2_OFFT
LED1_OFFT
LED0_OFFT
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Description
Sets the trip value for Comparator L3_CMPR. If ambient light levels fall below this trip point, L3_OUT is
set. Each code is equal to 0.5 μA (typical). Full scale is 127 μA (typical).
Description
Sets the hysteresis value for Comparator L3_CMPR. If ambient light levels increase above L3_TRIP + L3_HYS,
L3_OUT is cleared. Each code is equal to 0.5 μA (typical). Full scale is 127 μA (typical).
Description
LED current sink fade-on/fade-off transfer characteristic.
0 = linear.
1 = square.
0 = LED2 sink is disabled.
1 = LED2 sink is enabled.
0 = LED1 sink is disabled.
1 = LED1 sink is enabled.
0 = LED0 sink is disabled.
1 = LED0 sink is enabled.
Description
Sets the LED on time when used in conjunction with the LEDx_OFFT timer to perform LED blinking. All
three LED sinks share this common timer.
00 = 0.2 sec.
01 = 0.6 sec.
10 = 0.8 sec.
11 = 1.2 sec.
Sets the LED2 off time when used in conjunction with the LED_ONT timer to perform LED blinking. LED2
stays on continuously if the timer is disabled.
00 = LED2 timer is disabled.
01 = 0.6 sec.
10 = 0.8 sec.
11 = 1.2 sec.
Sets the LED1 off time when used in conjunction with the LED_ONT timer to perform LED blinking. LED1
stays on continuously if the timer is disabled.
00 = LED1 timer is disabled.
01 = 0.6 sec.
10 = 0.8 sec.
11 = 1.2 sec.
Sets the LED0 off time when used in conjunction with the LED _ONT timer to perform LED blinking.
LED0 stays on continuously if the timer is disabled.
00 = LED0 timer is disabled.
01 = 0.6 sec.
10 = 0.8 sec.
11 = 1.2 sec.
Description
Sets the hysteresis value for Comparator L2_CMPR. If ambient light levels increase above L2_TRIP + L2_HYS,
L2_OUT is cleared. Each code is equal to 4 μA (typical). Full scale is 1000 μA (typical).
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