MAX16816 Datasheet, PDF(27/33 Page) Maxim Integrated Products – Programmable Switch-Mode LED Driver with Analog-Controlled PWM Dimming

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MAX16816 Datasheet, PDF (27/33 Pages) Maxim Integrated Products – Programmable Switch-Mode LED Driver with Analog-Controlled PWM Dimming

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Programmable Switch-Mode LED Driver

with Analog-Controlled PWM Dimming

Write Time Slots

There are two types of write time slots: Write-1 time

slots and Write-0 time slots. The bus master uses a

Write-1 time slot to write a logic â1â to the MAX16816

and a Write-0 time slot to write a logic â0â. All write time

slots must be a minimum of 60Âµs in duration with a min-

imum of a 1Âµs recovery time between individual Write

slots. Both types of write time slots are initiated by the

master pulling the 1-Wire bus low (Figures 7 and 8).

To generate a Write-1 time slot, the bus master must

release the 1-Wire bus within 15Âµs after pulling the bus

low. When the bus is released, the pullup resistor will

pull the bus high. To generate a Write-0 time slot, the

bus master must continue to hold the bus low for the

duration of the time slot (at least 60Âµs) after pulling the

1-Wire bus low. The MAX16816 samples the 1-Wire bus

during a window that lasts from 15Âµs to 60Âµs after the

master initiates the Write time slot. If the bus is high

during the samples window, a â1â is written to the

MAX16816. If the line is low, a â0â is written to the

MAX16816.

tW1L

VOH

VOL

RESISTOR

Figure 7. 1-Wire Write-1 Time Slot

MAX16816

SAMPLING

WINDOW

tREC

tSLOT

MASTER

tW0L

VOH