xr21v1412 Exar Corporation, xr21v1412 Datasheet - Page 6

• Manufacturer Part Number: xr21v1412
• Description: 2-ch Full-speed Usb Uart
• Manufacturer: Exar Corporation

XR21V1412
2-CH FULL-SPEED USB UART
The USB interface of the V1412 is compliant with the USB 2.0 Full-Speed Specifications. The USB
configuration model presented by the V1412 to the device driver is compatible to the Abstract Control Model of
the USB Communication Device Class (CDC-ACM). The V1412 uses the following set of parameters:
•
•
•
Exar’s USB Vendor ID is 0x04E2. This is the default Vendor ID that is used for the V1412 unless a valid
EEPROM is present on the I2C interface signals. If a valid EEPROM is present, the Vendor ID from the
EEPROM will be used.
The default USB Product ID for the V1412 is 0x1412. If a valid EEPROM is present, the Product ID from the
EEPROM will be used.
The I2C interface provides connectivity to an external I2C memory device (i.e. EEPROM) that can be read by
the V1412 for configuration.
The SDA and SCL are used to specify whether Remote Wakeup and/or Bus Powered configurations are to be
supported. These pins are sampled at power-up. The following table describes how Remote Wakeup and Bus
Powered support.
1.0 FUNCTIONAL DESCRIPTIONS
1.1
1.2
1.1.1
1.1.2
1 Control Endpoint
1 Configuration is supported
2 interfaces per UART channel
SDA
■
■
■
1
1
0
0
Endpoint 0 as outlined in the USB specifications
Each UART channel has a single interrupt endpoint
Each UART channel have bulk-in and bulk-out endpoints
USB interface
I2C Interface
USB Vendor ID
USB Product ID
SCL
1
0
1
0
R
EMOTE
T
ABLE
S
UPPORT
Yes
Yes
No
No
W
1: R
AKE
-
EMOTE
UP
W
AKEUP AND
P
Self-Powered
Bus-Powered
Self-Powered
Bus-Powered
OWER
6
M
ODE
P
OWER
M
ODES
Default, if no EEPROM is present
C
OMMENTS
REV. 1.0.0