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LP5569RTWR bảng dữ liệu(PDF) 16 Page - Texas Instruments

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tên linh kiện LP5569RTWR
Giải thích chi tiết về linh kiện  Nine-Channel I2C RGB LED Driver With Engine Control and Charge Pump
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LP5569RTWR bảng dữ liệu(HTML) 16 Page - Texas Instruments

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LP5569
SNVSAP8 – JULY 2017
www.ti.com
Product Folder Links: LP5569
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
Feature Description (continued)
Figure 8. Simplified Data Flow of Master Fader
8.3.1.2.3.1
PWM Master Fader on EN/PWM Pin
The EN/PWM pin provides a dual-function input. On power up, the pin functions as the device enable (EN)
function, where the first rising edge enables the LP5569 device. After the chip_en bit is set high in the CONFIG
register, the pin is reconfigured for PWM master-fader control of the LEDs. The LEDx_CONTROL register
(addresses 07h–0Fh) MF_MAPPINGx bits = 5h configures LEDx for PWM control.
The PWM input is a sampled input which converts the input duty-cycle information into an 11-bit code. The use
of a sampled input eliminates any noise and current ripple that is typical of traditional PWM-controlled LED
drivers. The PWM input uses logic-level thresholds with VIH_MIN = 1.25 V and VIL_MAX = 0.4 V. Because this is a
sampled input, there are limits on the maximum PWM input frequency as well as the resolution that can be
achieved.
8.3.1.2.3.1.1
PWM Master Fader Resolution and Input Frequency Range
The PWM input frequency range is 100 Hz to 20 kHz. To achieve the full 11-bit maximum resolution of PWM
duty cycle to the code, the input PWM duty cycle must be
≥ 11 bits, and the PWM sample period (1 / fSAMPLE)
must be smaller than the minimum PWM input pulse duration. Figure 9 shows the possible brightness code
resolutions based on the input PWM frequency.



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