ADP5501 Analog Devices, ADP5501 Datasheet - Page 23

• 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

Table 15. Register 0x08, Level 2 (Office) Dim Current (OFFICE_DIM)
Bit
7
6 to 0
Table 16. Register 0x09, Level 3 (Dark) Maximum Current (DARK_MAX)
Bit
7
6 to 0
Table 17. Register 0x0A, Level 3 (Dark) Dim Current (DARK_DIM)
Bit
7
6 to 0
Table 18. Register 0x0B, Backlight Current Value (BL_VALUE)
Bit
7
6 to 0
Table 19. Register 0x0C, Light Sensor Comparator Configuration (ALS_CMPR_CFG)
Bit
7 to 5
4
3
2
1
0
Table 20. Register 0x0D, Level 2 (Office) Comparator Trip Point (L2_TRIP)
Bit
6 to 0
Name
Not used
OFFICE_DIM
Name
Not used
DARK_MAX
Name
Not used
DARK_DIM
Name
Not used
BL_VALUE
Name
FILT
FORCE_RD
L3_OUT
L2_OUT
L3_EN
L2_EN
Name
L2_TRIP
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
R/W
R/W
R
R
R/W
R/W
Description
Dim current setting for the backlight when BL_LVL is at Level 2 (office).
See Figure 16 for the backlight current vs. sink code relationship.
Description
Maximum current setting for the backlight when BL_LVL is at Level 3 (dark).
See Figure 16 for the backlight current vs. sink code relationship.
Description
Dim current setting for the backlight when BL_LVL is at Level 3 (dark).
See Figure 16 for the backlight current vs. sink code relationship.
Description
Read-only register that contains the present value to which the backlight is programmed.
Description
Light sensor filter time.
000 = 0.08 sec.
001 = 0.16 sec.
010 = 0.32 sec.
011 = 0.64 sec.
100 = 1.28 sec.
101 = 2.56 sec.
110 = 5.12 sec.
111 = 10.24 sec.
Forces the light sensor comparator to perform a single conversion.
This bit is cleared by the internal state machine once the conversion is complete.
0 = ambient light is greater than Level 3 (dark).
1 = the light sensor comparator has detected a change in ambient light from Level 2 (office) to Level
3 (dark).
0 = ambient light is greater than Level 2 (office).
1 = the light sensor comparator has detected a change in ambient light from Level 1 (daylight) to
Level 2 (office).
0 = disable Comparator L3_CMPR .
1 = enable Comparator L3_CMPR. If automatic backlight adjustment is required, BL_AUTO_ADJ
must be set also.
0 = disable Comparator L2_CMPR.
1 = enable Comparator L2_CMPR. If automatic backlight adjustment is required, BL_AUTO_ADJ
must be set also.
Description
Sets the trip value for Comparator L2_CMPR. If ambient light levels fall below this trip point, L2_OUT
is set. Each code is equal to 4 μA (typical). Full scale is 1000 μA (typical).
Rev. 0 | Page 23 of 28
ADP5501