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MAX6948B
High-Efficiency PWM LED Driver with Boost
Converter and Five Constant-Current GPIO Ports
Register Description
The MAX6948B contains 25 internal registers (Table 1).
Registers 0x00 to 0x15 control ports P0–P4 and remain
Register 0x20 and 0x21 set the PWM duty cycle for the
integrated boost converter. Register 0x22 conveys the
boost-converter status.
compatible with the MAX6946/MAX6947 port expanders.
Table 1. Register Address Map and Autoincremen t Address
ADDRESS
CODE (hex)
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F
0x10
0x11
0x12
0x13
0x14
0x15
0x20
0x21
0x22
AUTO-INCREMENT
ADDRESS (hex)
0x01
0x02
0x03
0x04
0x10
—
—
—
—
—
0x10
0x10
0x10
0x10
0x0E
—
0x11
0x12
0x13
0x14
—
0x10
0x21
—
—
READ/
WRITE
R/ W
R/ W
R/ W
R/ W
R/ W
—
—
—
—
—
R/ W
R/ W
R/ W
—
Read only
—
R/ W
R/ W
R/ W
R/ W
—
R/ W
R/ W
R/ W
R/ W
REGISTER
FUNCTION
P0
P1
P2
P3
P4
Reserved
Reserved
Reserved
Reserved
Reserved
Group control
(P0–P4)
Group control
(P0, P1)
Group control
(P2, P3, P4)
Reserved
Port input
Reserved
Configuration
Ramp-down
Ramp-up
Output current
Reserved
Global current
Boost PWM
(MSB)
Boost PWM (LSB)
Boost status
DESCRIPTION
Port P0 I/O control and PWM settings
Port P1 I/O control and PWM settings
Port P2 I/O control and PWM settings
Port P3 I/O control and PWM settings
Port P4 I/O control and PWM settings
—
—
—
—
—
Write: Simultaneously sets I/O and PWM settings for
ports P0–P4
Read: Reads contents of address 0x00
Write: Simultaneously sets I/O and PWM settings for
ports P0, P1
Read: Reads contents of address 0x00
Write: Simultaneously sets I/O and PWM settings for
ports P2, P3, P4
Read: Reads contents of address 0x00
—
Reads GPIO input values
—
Half-/full-boost current, reset options, PWM stagger,
start/stop status, reset run, shutdown setting
Port ramp-down and hold-off settings
Port ramp-up setting
Port half-/full-current settings
—
Port maximum current setting
Boost circuit LED PWM setting (MSB)
Boost circuit LED PWM setting (LSB)
Boost circuit status and standby setting
10
Maxim Integrated
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