The MAX20463A evaluation kit (EV kit) demonstrates the
MAX20463A; a small, integrated USB Type-C™ solution
for automotive radio, navigation, connectivity, and USB
head units and infotainment applications. The device
provides a one-chip solution to convert an existing downstream-
facing port from supporting the USB-A connector
to supporting the USB Type-C connector.
The device features an integrated USB Type-C interface
to control the new configuration channel (CC) pins found
in the USB Type-C connector. It supports the downstreamfacing
port (DFP) role and supports VBUS current limits
including 1.5A and 3.0A. The MAX20463A can coexist
with BC1.2 and Apple charging technologies, as these are
controlled by the host emulator in the upstream module.
An integrated high-side power switch protects the device
against faults and allows most fault conditions to be
detected and handled by the upstream 5V power supply.
This avoids possible contention, in which both the
upstream 5V power supply and the MAX20463A detect
the same fault and simultaneously try to resolve it.
The BIAS circuitry provides a solution to the transient
conditions seen in automotive USB charging applications.
The device is designed to stay powered on during the CC
attach process even if VBUS droops due to an overcurrent,
or other low voltage condition, for a short period of time. The
period of time that the part can stay powered on can be configured
by the module design engineer to provide the time
required for the upstream 5V power supply to detect and
handle the fault. The device stay-on time is determined by
the amount of capacitance on BIAS, which must be at least
22μF, but can be increased above this value. The device
and its solution circuit are designed to conform to the USBIF
specification for short-to-ground response.
MAX20463A is an automotive USB protector that integrates
USB shield short-to-battery protection. A short circuit
from the USB shield to the car battery can occur when
a customer’s portable device cable is connected to the
vehicle Type-C receptacle, and the far end of this cable
falls into the 12V cigarette lighter (accessory port) contacting
the 12V center terminal. This situation can result
in a damaging amount of current flow through the USB
cable, and can cause cable combustion if the cigarettelighter
fuse response time is insufficient. MAX20463A
is designed to sense this condition (shield shorted to
battery) with the SENSE pin and control an N-channel
MOSFET with the GDRV pin to stop the flow of current.
The device and EV kit operate from a VBUS voltage of
4.75V to 7V.
The EV Kit enables testing and configuration of the
MAX20463A’s CC current advertisement behavior.
The device provides a CC_SEL pin for this purpose.
Connecting the CC_SEL pin to BIAS or GND through
jumper J6 selects between the two different current levels
(refer to Table 1)
The EV kit is configured for 3A output operation and the
included three-meter USB cable allows for demonstration
of use with an upstream-voltage-compensated power
supply such as MAX16984, MAX16987, MAX20037, or
MAX20038.
Applications
- Automotive Downstream USB Modules
- Automotive USB Captive-Cable Housing
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