MAX6948B MAXIM [Maxim Integrated Products], MAX6948B Datasheet - Page 10

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

High-Efficiency PWM LED Driver with Boost
Converter and Five Constant-Current GPIO Ports
The MAX6948B contains 25 internal registers (Table 1).
Registers 0x00 to 0x15 control ports P0–P4 and remain
compatible with the MAX6946/MAX6947 port expanders.
Table 1. Register Address Map and Autoincrement Address
10
CODE (hex)
ADDRESS
0x0C
0x0D
0x0A
0x0B
0x0E
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
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
—
—
—
—
—
—
—
—
—
Register Description
Read only
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
R/W
R/W
R/W
—
—
—
—
—
—
—
—
Boost PWM (LSB)
Output current
Global current
Group control
Group control
Group control
Configuration
Ramp-down
Boost status
(P2, P3, P4)
FUNCTION
Boost PWM
REGISTER
Port input
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Ramp-up
Reserved
(P0–P4)
(P0, P1)
(MSB)
P0
P1
P2
P3
P4
Register 0x20 and 0x21 set the PWM duty cycle for the
integrated boost converter. Register 0x22 conveys the
boost-converter status.
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
DESCRIPTION