Thursday, February 2, 2023

Highly Integrated USB Decoder IC

By Sharad Bhowmick

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The AP43776Q supports USB power delivery (PD) 3.1 standard power range (SPR) and programmable power supply (PPS).

The AP43776Q USB decoder IC from Diodes is a highly integrated, dual-channel, USB Type-C, PD3.1 / PPS, BC 1.2 and QC protocol decoder. It supports USB power delivery (PD) 3.1 standard power range (SPR) and programmable power supply (PPS). It supports legacy battery charging (BC) 1.2  as well as Quick Charge QC5, fast charging protocols and is highly optimized for multi-port automotive USB device charging systems.

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The AP43776Q features a built-in microcontroller unit (MCU) with 12kB of one-time programmable (OTP) ROM, plus a multi-time programmable (MTP) ROM resource tool. It features an I2C interface that enables inter-chip communication with DC-DC controllers and converters in the charging system. This simplifies the control loop and lowers overall component costs. The device can support the full range of PPS APDO (augmented power data object) from 3.3V to 21V with 20mV/step voltage resolution and up to 6A current with 50mA/step resolution for power management. 

The AP43776Q also offers an embedded MCU and built-in ADC converters for voltage and temperature measurement, where overtemperature protection (OTP) and other specific functions can be implemented through I2C pins and rich GPIO pins. Working in conjunction with two I2C-equipped Buck-Boost controllers or converters which have PD3.1 PPS output circuitry, the AP43776Q serves as the I2C master and supports two independent PD3.1 PPS charging applications without using additional output enable MOS chips for each PD3.1 output port.

The AP43776Q comes with a built in firmware. It can support various smart power-management functions such as a power-sharing scheme between two attached USB Type-C PD devices, low-battery power de-rating, thermal power de-rating, LED light indication, etc. Two AP43776Q devices can also be interconnected through a UART (GPIO) pin to implement a smart power-sharing scheme for all four connected USB Type-C ports attached to a fixed power source

Features of AP43776Q

    • AEC-Q100 Qualified
    • Dual-channel independent USB Type-C PD3.1/PPS decoder
    • USB-IF PD3.1/PPS certificated TID: 6206
    • Quick Charge QC5 certificated No.: QC20211008263
    • Type-C PD Display Port Alternative mode
    • Built-in ADC and multi-channel multiplexer for voltage and temperature measurement
    • e-Marker detection and VCONN 30mA capability
    • Cable-loss compensations
    • I2C Interface and Interrupt
    • CC1/CC2 to VBUS short protection up to 24V
    • Moisture detection between DP and DN
    • Thermal protection through external NTC
    • Halogen and Antimony Free.

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