ASL3416SHN datasheet(9/38 Pages) NXP

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ASL3416SHN

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Product data sheet

Rev. 6 — 16 September 2019

9 of 38

NXP Semiconductors

ASL3416SHN

Enhanced three channel LED buck driver

8.5.2 Hysteresis programming via SPI

ASL3416SHN provides an option to program the level of hysteresis via the SPI interface.

The hysteresis setting is independent of the I_CH1, I_CH2 and I_CH3 bits in LED current

range registers.

The hysteresis voltage that is set via SPI, and the value of the external sense resistor,

determine the actual level.

(2)

The switching frequency varies depending on the hysteresis level, the values of the

external components, and the input and the output voltages.

The ASL3416SHN is specified for switching frequencies from 100 kHz to 2 MHz.

Note: For all hysteresis settings, the hysteresis, specified in mV, corresponds with the

lowest average LED current in the static characteristics section.

IHyst

VHyst

Rsense

---------------

Table 9.

Hysteresis channel 1 register, address 0x0Bh

Bit

Symbol

Description

Value

Function

7:2

reserved

000000

reserved; keep clear for future use

1:0

HCH1[1:0]

hysteresis channel 1

setting 0

setting 1

setting 2

setting 3

Table 10.

Hysteresis channel 2 register, address 0x0Ch

Bit

Symbol

Description

Value

Function

7:2

reserved

000000

reserved; keep clear for future use

1:0

HCH2[1:0]

hysteresis channel 2

setting 0

setting 1

setting 2

setting 3

Table 11.

Hysteresis channel 3 register, address 0x0Dh

Bit

Symbol

Description

Value

Function

7:2

reserved

000000

reserved; keep clear for future use

1:0

HCH3[1:0]

hysteresis channel 3

setting 0

setting 1

setting 2

setting 3

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