CY7C65640A-LFC Cypress Semiconductor Corp, CY7C65640A-LFC Datasheet - Page 5

• Manufacturer Part Number: CY7C65640A-LFC
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C65640A-LFC

• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 3.15V
• Operating Supply Voltage (max): 3.45V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 56
• Lead Free Status / RoHS Status: Not Compliant

Overcurrent Detection
Overcurrent detection includes timed detection of 8 ms by
default. This parameter is configured from the external EEPROM
in a range of 0 ms to 15 ms for both an enabled port and a
disabled port individually. Detection of over on downstream ports
is managed by control pins connected to an external power
switch device.
The OVR[n]# pins of the CY7C65640A series are connected to
the respective external power switch's port overcurrent
indication (output) signals. Upon detecting an overcurrent
condition, the hub device reports the overcurrent condition to the
host and disables the PWR# output to the external power device.
Port Indicators
The USB 2.0 port indicators are also supported directly by
TetraHub. According to the specification, each downstream port
of the hub supports an optional 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 TeraHub descriptor specifies that port indicators are
supported (wHubCharacteristics, bit 7 is set). If port indicators
are not included in the hub, EEPROM should disable this.
Each port indicator is strategically located directly on the
opposite edge of the port which it is associated with. The
indicator provides two colors: green and amber. This is imple-
mented as two separate LEDs, one amber and the other green.
Table 1. Automatic Port State to Port Indicator Color Mapping
Table 2. Port Indicator Color Definitions in Manual Mode
Note. Information presented in
Document #: 38-08019 Rev. *M
With
Without
Off
Amber
Green
Blinking Off/Green
Blinking Off/Amber
Blinking Green/Amber
Switching
Port
Off or amber if due to an
overcurrent condition
Off
Color Definition
Powered Off
Table 1
and
Table 2
Off
Off or amber if due to an
overcurrent condition
Not operational
Error condition
Fully operational
Software attention
Hardware attention
Reserved
Configured, Resetting, Testing
Disconnected, Disabled, Not
Downstream Facing Hub Port State
is from USB 2.0 specification tables 11-6 and 11-7, respectively.
Port State
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 are used to provide information to the user.
The significance of the color of the LED depends on the opera-
tional mode of the TetraHub. There are two modes of operation
for the TetraHub port indicators: automatic and manual.
On power up, the TeraHub defaults to automatic mode, where
the color of the port indicator (green, amber, off) indicates the
functional status of the TetraHub port. In automatic mode,
TetraHub turns on the green LED whenever the port is enabled
and the amber LED when it detects an overcurrent condition. The
color of the port indicator is set by the port state machine.
Blinking of the LEDs is not supported in automatic mode.
identifies the mapping of color to port state in automatic mode.
In manual mode, the indicators are under the control of the host,
which can turn on one of the LEDs, or leave them off. This is done
by a system software USB Hub class request. Blinking of the
LEDs is supported in manual mode. The port indicators enable
the user to intervene on any error detection. For example, when
babble is detected on plugging in a defective device, or on occur-
rence of an overcurrent condition, the port indicators corre-
sponding to the downstream port blink green or only light the
amber LED, respectively.
the indicators when TetraHub is in manual mode.
Green
Green
Enabled, Transmit,
or TransmitR
Table 2
Off
Off
Suspended, Resuming,
displays the color definition of
SendEOR, Restart_E/S
CY7C65640A
Page 5 of 24
Table 1
[+] Feedback