MAX17061AEVKIT+ Maxim Integrated Products, MAX17061AEVKIT+ Datasheet - Page 17

• Manufacturer Part Number: MAX17061AEVKIT+
• Description: Power Management Modules & Development Tools MAX17061A EVAL KIT MAX17061A EVAL KIT
• Manufacturer: Maxim Integrated Products

Specifications of MAX17061AEVKIT+

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 2. Operating Modes Selected by Device Control Register Bits 1 and 2
Brightness control register: Address is 0x00. This register is both readable and writable for all 8 bits, BRT0–BRT7,
which are used to control the LED brightness level. In SMBus dimming mode, an SMBus write byte cycle to register
0x00 sets the output brightness level. The SMBus setting of 0xFF for this register sets the backlight controller to the
maximum brightness output, and 0x00 sets the minimum backlight brightness (about 2.7%). The default value for reg-
ister 0x00 is 0xFF. A write byte cycle to register 0x00 has no effect when the backlight controller is in PWM mode. The
SMBus read byte cycle to register 0x00 returns the current brightness level, regardless of the dimming mode.
Bit field definitions:
Device control register: Address is 0x01. This register is both readable and writable for Bit 0 to Bit 2. Bit 0, also
named BL_CTL, is used as ON/OFF control for the output LEDs. Bit 1 and Bit 2, named PWM_SEL and PWM_MD,
respectively, control the operating mode of the backlight controller. Bit 3 through Bit 7 are reserved bits. All reserved
bits, return zero when read, and are ignored by the controller when written. A value of 1 written to BL_CTL turns on
the backlight in 10ms or less after the write cycle completes. A value of zero written to BL_CTL immediately turns off
the backlight.
Bit field definitions:
BIT FIELD
RESERVE
Bit 7 (R/W)
BIT FIELD
REGISTER 0x01
Bit [7..0]
Bit 2
Bit 1
Bit 0
Bit 7
BRT7
PWM_MD
REGISTER 0x00
X
1
0
DEFINITION
RESERVED
PWM_SEL
PWM_MD
BL_CTL
DEFINITION
Bit 6 (R/W)
Bit 6
BRT [7..0]
______________________________________________________________________________________
BRT6
PWM_SEL
PWM mode select (1 = absolute brightness, 0 = % change), default = 0
Brightness MUX select (1 = PWM pin, 0 = SMBus value), default = 0
BL on/off control (1 = on, 0 = off), default = 0
RESERVED
8-bit brightness setting, adjusting brightness levels in 256 steps, default value is 0xFF.
DEVICE CONTROL REGISTER
1
0
0
Bit 5 (R/W)
Bit 5
SMBus for LCD Panel Applications
BRT5
BRIGHTNESS CONTROL REGISTER
8-String White LED Driver with
RESERVED
Bit 4
Bit 4 (R/W)
SMBus mode
DPST mode
PWM mode
BRT4
MODE
RESERVED
Bit 3
Bit 3 (R/W)
BRT3
DESCRIPTION
PWMI input duty cycle
SMBus command
Product of PWMI input duty cycle and SMBus command
DESCRIPTION
Bit 2 (R/W)
PWM_MD
DPWM DUTY-CYCLE SETTING
Bit 2 (R/W)
BRT2
DEFAULT VALUE 0x00
DEFAULT VALUE 0xFF
PWM_SEL
Bit 1 (R/W)
Bit 1 (R/W)
BRT1
Bit 0 (R/W)
BL_CTL
BRT0
Bit 0
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