CY7C65631-56LTXC Cypress Semiconductor Corp, CY7C65631-56LTXC Datasheet - Page 5

• Manufacturer Part Number: CY7C65631-56LTXC
• Description: CY7C65631-56LTXC
• Manufacturer: Cypress Semiconductor Corp
• Series: EZ-USB HX2LP Lite™r

Specifications of CY7C65631-56LTXC

• Controller Type: USB 2.0 Hub Controller
• Interface: USB/Serial
• Voltage - Supply: 3.15 V ~ 3.45 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 56-VQFN Exposed Pad, 56-HVQFN, 56-SQFN, 56-DHVQFN
• Current - Supply: 231mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 428-3034

Downstream Ports
The CY7C65621/31 supports a maximum of four downstream
ports, each of which may be marked as usable or removable in
the extended configuration (0xD2 EEPROM load or 0xD4
EEPROM load, see
Downstream D+ and D– pull down resistors are incorporated in
CY7C65621/31 for each port. Before the hubs are configured,
the ports are driven SE0 (Single Ended Zero, where both D+ and
D– are driven low) and are set to the unpowered state. When the
hub is configured, the ports are not driven, and the host may
power the ports by sending a SetPortPower command for each
port. After a port is powered, any connect or disconnect event is
detected by the hub. Any change in the port state is reported by
the hubs back to the host through the Status Change Endpoint
(endpoint 1). Upon receipt of SetPortReset request for a port with
a device connected, the hub does as follows:
■
■
■
■
Babble consists of a non idle condition on the port after EOF2. If
babble is detected on an enabled port, that port is disabled. A
ClearPortEnable request from the host also disables the
specified port.
Downstream ports can be individually suspended by the host
with the SetPortSuspend request. If the hub is not suspended, a
remote wakeup event on that port is reflected to the host through
a port change indication in the Hub Status Change Endpoint. If
the hub is suspended, a remote wakeup event on this port is
forwarded to the host. The host may resume the port by sending
a ClearPortSuspend command.
Upstream Port
The upstream port includes the transmitter and the receiver state
machine. The transmitter and receiver operate in high speed and
full speed depending on the current hub configuration.
The transmitter state machine monitors the upstream facing port
while the Hub Repeater has connectivity in the upstream
direction. This machine prevents babble and disconnect events
on the downstream facing ports of this hub from propagating and
causing the hub to be disabled or disconnected by the hub to
which it is attached.
Power Switching
The CY7C65621/31 includes interface signals for external port
power switches. Both ganged and individual (per-port) configu-
rations are supported, with individual switching being the default.
Initially all ports are unpowered. After enumerating, the host may
power each port by sending a SetPortPower request for that port.
The power switching and over-current detection of downstream
ports is managed by control pins connected to an external power
Document #: 001-52934 Rev. *B
Performs a USB reset on the corresponding port
Puts the port in an enabled state
Enables the green port indicator for that port (if not previously
overridden by the host)
Enables babble detection when the port is enabled.
Configuration Options
on page 13.
switch device. PWR [n]# output pins of the CY7C65621/31 series
are connected to the respective external power switch's port
power enable signals. Note that each port power output pin of
the external power switch must be bypassed with an electrolytic
or tantalum capacitor as required by the USB specification.
These capacitors supply the inrush currents, which occur during
downstream device hot-attach events. The polarity of this pin can
be configured through the EEPROM; see
Overcurrent Detection
Overcurrent detection includes 8 ms of timed filtering by default.
This parameter is configured from the external EEPROM in a
range of 0 ms to 15 ms for both enabled ports and disabled ports
individually. Detection of overcurrent on downstream ports is
managed by control pins connected to an external power switch
device.
The OVR[n]# pins of the CY7C65621/31 series are connected to
the respective external power switch's port overcurrent
indication (output) signals. After detecting an overcurrent
condition, hub reports overcurrent condition to the host and
disables the PWR# output to the external power device. The
polarity of the OVR pins can be configured through the
EEPROM; see
Port Indicators
The USB 2.0 port indicators are also supported directly by
CY7C65621/31.
downstream port of the hub optionally supports a status
indicator. The presence of indicators for downstream facing ports
is specified by bit 7 of the wHubCharacteristics field of the hub
class descriptor. The default CY7C65621/31 descriptor specifies
that port indicators are supported (wHubCharacteristics, bit 7 is
set). If port indicators are not included in the hub, disable this bit
through EEPROM settings.
Each port indicator pin is strategically located directly on the
opposite edge of the port with which it is associated. A port
indicator provides two colors: green and amber. This is usually
implemented as two separate LEDs, one amber and the other
green. A combination of hardware and software control is used
to inform the user of the current status of the port or the device
attached to the port and to guide the user through problem
resolution. Colors and blinking provide information to the user.
The significance of the color of the LED depends on the opera-
tional mode of CY7C65621/31. The CY7C65621/31 port
indicators has two modes of operation: automatic and manual.
On power up the CY7C65621/31 defaults to automatic mode,
where the color of the Port Indicator (green, amber, off) indicates
the functional status of the CY7C65621/31 port. In automatic
mode, the CY7C65621/31 turns on the green LED whenever the
port is enabled and the amber LED when an overcurrent
condition is detected. The color of the port indicator is set by the
port state machine. Blinking of the LEDs is not supported in
automatic mode.
state in automatic mode.
0xD4 Load
Table 1
According
identifies the mapping of color to port
on page 14.
to
the
CY7C65621/31
0xD4 Load
specification,
Page 5 of 25
on page 14.
each
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