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8-String WLED Driver with Integrated Step-Up
Regulator and SMBus/PWM Dimming Capability
In PWM mode, the output LED brightness is solely controlled by the percentage duty cycle of the input signal to
PWMI. In SMBus mode, the input of PWMI has no effect on the dimming control, and only the SMBus command to the
brightness control register adjusts the output brightness. In DPST mode, the overall brightness level is the normalized
product of the SMBus command setting and PWM input duty cycle. The PWM signal starts from 100% when operating
in DPST mode. The default value for register 0x01 is 0x00.
Fault/Status Register: Address is 0x02. This register has 6 status bits that allow monitoring the backlight controller’s
operating state. Bit 6 and Bit 7 are reserved bits, and Bit 3 is the status indicator or backlight. The other 5 bits are
fault indicators. Bit 0 is a logical OR of all fault codes to simplify error detection (GLOBAL FAIL, OVCURR FAIL, 1CH
SHORT/OPEN, 2 CH SHORT/OPEN, THRM_SHDN). All the bits in this register are read only. The reserved bits return
a 0 when read.
REGISTER 0x02
FAULT/STATUS REGISTER
DEFAULT VALUE 0X00
Reserved
Bit 7 (R)
Reserved
Bit 6 (R)
2_CH_SD
Bit 5 (R)
1_CH_SD
Bit 4 (R)
BL_STAT
Bit 3 (R)
OVCURR
Bit 2 (R)
THRM_SHDN
Bit 1 (R)
FAULT
Bit 0 (R)
Bit Field Definitions:
BIT FIELD
DEFINITION
DESCRIPTION
Bit
Bit
Bit
Bit
Bit
Bit
5
4
3
2
1
0
2_CH_SD
1_CH_SD
BL_STAT
OV_CURR
THRM_SHDN
FAULT
Two or more LED output channels are shut down (1 = shutdown, 0 = okay)
One LED output channel is shut down (1 = shutdown, 0 = okay)
Backlight status (1 = BL on, 0 = BL off)
Input overcurrent (1 = overcurrent condition, 0 = current okay)
Thermal shutdown (1 = thermal fault, 0 = thermal okay)
Fault occurred (logic OR of all the fault conditions)
Identification Register: Address is 0x03. The ID register contains two bit fields to denote the manufacturer and the
silicon revision of the controller IC. The bit field widths were chosen to allow up to 32 vendors with up to eight silicon
revisions each. This register is read only.
REGISTER 0x03
ID REGISTER
DEFAULT VALUE 0X80
LED Panel
Bit 7 = 1
MFG3
Bit 6 (R)
MFG2
Bit 5 (R)
MFG1
Bit 4 (R)
MFG0
Bit 3 (R)
REV2
Bit 2 (R)
REV1
Bit 1 (R)
REV0
Bit 0 (R)
Bit Field Definitions:
BIT FIELD
Bit 7
Bit [6:3]
Bit [2:0]
DEFINITION
LED Panel
MFG[3:0]
REV[2:0]
DESCRIPTION
Display panel using LED backlight, Bit 7 = 1
Manufacturer ID, see Table 5, default = 0
Silicon rev (revs 0 to 7 allowed for silicon spins), default = 0
The list of ID values for vendors is shown below, based on the current backlight controller vendor list and is not sorted
in any particular order.
Table 5. Vendor IDs
ID
0
1
2
3
4
Maxim
Micro Semi
MPS
O2 Micro
TI
VENDOR
ID
5
6
7-14
15
VENDOR
ST
Analog Devices
Reserved
Vendor ID register not implemented
20
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