Datasheet

ADP5520
Rev. A | Page 23 of 40
Table 10. Register 0x02, Backlight Control (BL_CONTROL)
Bit Mnemonic R/W Description
7 to 6 BL_LVL R/W Brightness level control for the backlight.
00 = daylight (L1).
01 = office (L2).
10 = dark (L3).
See the description for the BL_AUTO_ADJ bit.
5 to 4 BL_LAW R/W Backlight fade-on/fade-off transfer characteristic.
00 = linear.
01 = square.
10 = Cubic 1.
11 = Cubic 2.
3 BL_AUTO_ADJ R/W
0 = ambient light sensor comparators have no effect on the backlight operating level. The user
can manually adjust backlight operating level using the BL_LVL bits.
1 = ambient light sensor comparators automatically adjust the backlight operating level. The
internal state machine takes control of the BL_LVL bits.
2 OVP_EN R/W 0 = backlight ramp-down during OVP disabled.
1 = backlight ramp-down during OVP enabled.
1 FOVR R/W 0 = backlight fade override disabled.
1 = backlight fade override enabled.
0 KP_BL_EN R/W 0 = key press has no effect on the backlight.
1 = key press causes internal state machine to assert BL_EN and turn on the backlight. If this
function is used, this bit should be asserted before asserting nSTNBY = 1.
Table 11. Register 0x03, Backlight Off and Dim Timers (BL_TIME)
Bit Mnemonic R/W Description
7 to 4 BL_OFFT R/W Backlight off timer (timer should be set before BL_EN is set).
0000 = timer disabled.
0001 = 10 sec.
0010 = 15 sec.
0011 = 20 sec.
0100 = 25 sec.
0101 = 30 sec.
0110 = 35 sec.
0111 = 40 sec.
1000 = 50 sec.
1001 = 60 sec.
1010 = 70 sec.
1011 = 80 sec.
1100 = 90 sec.
1101 = 100 sec.
1110 = 110 sec.
1111 = 120 sec.
3 to 0 BL_DIMT R/W Backlight dim timer (timer should be set before BL_EN is set).
0000 = timer disabled.
0001 = 10 sec.
0010 = 15 sec.
0011 = 20 sec.
0100 = 25 sec.
0101 = 30 sec.
0110 = 35 sec.
0111 = 40 sec.
1000 = 50 sec.
1001 = 60 sec.