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MAX6948B
High-Efficiency PWM LED Driver with Boost
Converter and Five Constant-Current GPIO Ports
Configuration Register Format (0x10)
Use the configuration register to select PWM phasing
between outputs, monitor fade status, enable hardware
startup from shutdown, and select shutdown or run mode
(Table 2).
Initial Power-Up
On power-up, all control registers are set to power-
up values and the MAX6948B is in shutdown mode
(Table 3).
Table 2. Configuration Register Format (0x10)
REGISTER BIT
D7
D6
D5
D4
D3
D2
D1
D0
DESCRIPTION
Half-/full-boost current
Reset/POR option
PWM stagger
Hold-off status
Ramp-down (fade-off) status
Ramp-up status
Reset-run enable
Run
VALUE
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
FUNCTION
Half-boost current set by R FB
Full-boost current set by R FB
RST does not change register data
RST resets registers to POR values
PWM outputs are in phase
PWM outputs are staggered
Device is not in hold-off
Device is in hold-off
Device is not in fade-off
Device is in fade-off
Device is not in ramp-up
Device is in ramp-up
Reset run disabled
Reset run enabled
Shutdown mode
Run mode
DEFAULT VALUE
1
0
0
Read only
Read only
Read only
0
0
Table 3. Power-On Reset (POR) Values
ADDRESS
CODE (hex)
0x00
0x01
0x02
0x03
0x04
0x10
0x11
0x12
0x13
0x15
0x20
0x21
0x22
READ/
WRITE
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
POWER-UP
VALUE (hex)
0xFF
0xFF
0xFF
0xFF
0xFF
0x00
0x00
0x00
0x03
0x07
0x00
0x00
0x01
REGISTER FUNCTION
P0
P1
P2
P3
P4
Configuration
Ramp-down
Ramp-up
Output current
Global current
Boost PWM (MSB)
Boost PWM (LSB)
Boost status
POR DESCRIPTION
Port P0 high impedance
Port P1 high impedance
Port P2 high impedance
Port P3 high impedance
Port P4 high impedance
Shutdown mode (reset run disabled)
Port ramp-down and hold-off disabled
Port ramp-up disabled
P0, P1 at full current; P2, P3, P4 at half current
Maximum output current
Zero PWM duty cycle
Zero PWM duty cycle
Boost circuit in standby mode
Maxim Integrated
11
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