MAX6948B MAXIM [Maxim Integrated Products], MAX6948B Datasheet - Page 11

• Manufacturer Part Number: MAX6948B
• Description: High-Efficiency PWM LED Driver with Boost Converter and Five Constant-Current GPIO Ports
• Manufacturer: MAXIM [Maxim Integrated Products]

Table 3. Power-On Reset (POR) Values
Converter and Five Constant-Current GPIO Ports
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).
Table 2. Configuration Register Format (0x10)
REGISTER BIT
CODE (hex)
ADDRESS
0x00
0x01
0x02
0x03
0x04
0x10
0x11
0x12
0x13
0x15
0x20
0x21
0x22
D7
D6
D5
D4
D3
D2
D1
D0
Configuration Register Format (0x10)
High-Efficiency PWM LED Driver with Boost
Ramp-down (fade-off) status
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
Half-/full-boost current
Reset/POR option
Reset-run enable
Ramp-up status
DESCRIPTION
Hold-off status
PWM stagger
Run
VALUE (hex)
POWER-UP
0xFF
0xFF
0xFF
0xFF
0xFF
0x00
0x00
0x00
0x03
0x07
0x00
0x00
0x01
REGISTER FUNCTION
VALUE
Boost PWM (MSB)
Boost PWM (LSB)
Output current
Global current
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Configuration
Boost status
Ramp-down
Ramp-up
P0
P1
P2
P3
P4
Half-boost current set by R
Full-boost current set by R
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
On power-up, all control registers are set to power-
up values and the MAX6948B is in shutdown mode
(Table 3).
FUNCTION
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
FB
FB
POR DESCRIPTION
Initial Power-Up
DEFAULT VALUE
Read only
Read only
Read only
1
0
0
0
0
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