REV. 1.3.0 1.3 I2C Interface The I2C interface provides connectivity to an external I2C mem" />
參數(shù)資料
型號(hào)： XR21V1414IM48-F
廠商： Exar Corporation
文件頁(yè)數(shù)： 2/34頁(yè)
文件大?。?/td> 0K
描述： IC UART FIFO USB QUAD 48TQFP
產(chǎn)品培訓(xùn)模塊： UART Product Overview
XR21V141x Full-Speed USB UART Family
特色產(chǎn)品： XR21V141x Full-Speed USB UART
標(biāo)準(zhǔn)包裝： 250
特點(diǎn)： *
通道數(shù)： 1，UART
FIFO's： 128 字節(jié)
規(guī)程： USB 2.0
電源電壓： 3.3V
帶自動(dòng)流量控制功能： 是
安裝類型： 表面貼裝
封裝/外殼： 48-TQFP
供應(yīng)商設(shè)備封裝： 48-TQFP（7x7）
包裝： 托盤
配用： 1016-1303-ND - EVAL BOARD FOR XR21V1414IM
其它名稱： 1016-1304
XR21V1414
10
4-CH FULL-SPEED USB UART
REV. 1.3.0
1.3
I2C Interface
The I2C interface provides connectivity to an external I2C memory device (i.e. EEPROM) that can be read by
the V1414 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.
1.3.1
EEPROM Contents
If SDA and SCL are both logic ’1’, the V1414 device will first confirm if there is an external EEPROM attached
by attempting to read the first 8 locations of the ROM. If address 0x07 of the ROM contains the value 0x58 (as
specified in Table 3), the contents of the ROM are assumed to be valid. Otherwise the EEPROM will be
ignored and the SDA / SCL bits are used to indicate remote wakeup support and device power mode.
The I2C address must be 0xA0. An EEPROM can be used to override default Vendor IDs and Device IDs, as
well as other attributes and maximum power consumption. Exar provides an in-circuit EEPROM programming
utility through the USB interface using UART Control block 0x65. Refer to Table 5, “Control Blocks,” on
page 17. The EEPROM programming utility can be downloaded from the Exar website. These values are
uploaded from the EEPROM to the corresponding USB Standard Device Descriptor or Standard Configuration
Descriptor. For details of the USB Descriptors, refer to the USB 2.0 specifications.
1.3.1.1
Vendor ID
The Vendor ID value replaces the idVendor field in the USB Standard Device Descriptor.
1.3.1.2
Product ID
The Product ID value replaces the idProduct field in the USB Standard Device Descriptor.
TABLE 2: REMOTE WAKEUP AND POWER MODES
SDA
SCL
REMOTE WAKE-UP
SUPPORT
POWER MODE
1
No
Self-Powered
1
0
No
Bus-Powered
0
1
Yes
Self-Powered
0
Yes
Bus-Powered
TABLE 3: EEPROM CONTENTS
EEPROM
ADDRESS
CONTENTS
0
Vendor ID (LSB)
1
Vendor ID (MSB)
2
Product ID (LSB)
3
Product ID (MSB)
4
Device Attributes
5
Device Maximum Power
6
Reserved
7
Signature of 0x58 (’X’). If the signature is not correct, the contents of the EEPROM are ignored.
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