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參數(shù)資料
| 型號(hào)： | TUSB2077 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 7-PORT HUB FOR THE UNIVERSAL SERIAL BUS WITH OPTIONAL SERIAL EEPROM INTERFACE |
| 中文描述： | 7 -端口通用串行總線與可選的串行EEPROM接口集線器 |
| 文件頁(yè)數(shù)： | 10/16頁(yè) |
| 文件大?。?/td> | 242K |
| 代理商： | TUSB2077 |
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TUSB2077A
7-PORT HUB FOR THE UNIVERSAL SERIAL BUS
WITH OPTIONAL SERIAL EEPROMINTERFACE
SLLS414 – MARCH 2000
10
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
programming the EEPROM
An SGS Thompson M93C46 EEPROM or equivalent is used for storing the programmable VID and PID. When
the EEPROM interface is enabled (EXTMEM = 0), the EECLK and EEDATA are internally pulled down (100
μ
A)
inside the TUSB2077A. The internal pulldowns are disabled when the EEPROM interface is disabled
(EXTMEM = 1).
The EEPROM is programmed with the three 16-bit locations as shown in Table 1. Connecting pin 6 of the
EEPROM high (ORG = 1) organizes the EEPROM memory into 64
×
16 bit words.
Table 1. EEPROM Memory Map
ADDRESS
D15
D14
D13
D12–D8
D7–D0
00000
0
GANGED
00000
00000
00000000
00001
VID High-byte
VID Low-byte
00010
PID High-byte
PID Low-byte
XXXXXXXX
The D and Q signals of the EEPROM must be tied together using a 1 k
resistor with the common I/O operations
forming a single-wire bus. After system power-on reset, the TUSB2077A performs a one-time access read
operation from the EEPROM if the EXTMEM pin is pulled low and the chip select(s) of the EEPROM is
connected to the system power-on reset. Initially, the EEDATA pin will be driven by the TUSB2077A to send a
start bit (1) which is followed by the read instruction (10) and the starting-word address (00000). Once the read
instruction is received, the instruction and address are decoded by the EEPROM, which then sends the data
to the output shift register. At this point, the hub stops driving the EEDATA pin and the EEPROM starts driving.
A dummy (0) bit is then output and the first three 16-bit words in the EEPROM are output with the most significant
bit (MSB) first.
The output data changes are triggered by the rising edge of the clock provided by the TUSB2077A on the EECLK
pin. The SGS-Thompson M936C46 EEPROM is recommended because it advances to the next memory
location by automatically incrementing the address internally. Any EEPROM used must have the automatic
internal address advance function. After reading the three words of data from the EEPROM, the TUSB2077A
puts the EEPROM interface into a high-impedance condition (pulled down internally) to allow other logic to share
the EEPROM. The EEPROM read operation is summarized in Figure 8. For more details on EEPROM
operation, refer to SGS-Thompson Microelectronics M93C46 Serial Microwire Bus EEPROMdata sheet.
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| TUSB2077A | 制造商:TI 制造商全稱:Texas Instruments 功能描述:7-PORT HUB FOR THE UNIVERSAL SERIAL BUS WITH OPTIONAL SERIAL EEPROM INTERFACE |
| TUSB2077APT | 功能描述:USB 接口集成電路 7-Port Hub W/Opt Ser EEPROM Ifc RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
| TUSB2077APT | 制造商:Texas Instruments 功能描述:HUB UNI SERIAL BUS 7 PORT 48LQFP 制造商:Texas Instruments 功能描述:HUB, UNI SERIAL BUS, 7 PORT, 48LQFP 制造商:Texas Instruments 功能描述:HUB, UNI SERIAL BUS, 7 PORT, 48LQFP; USB Type:USB Transceiver; USB Version:1.1; Supply Voltage Min:3V; Supply Voltage Max:3.6V; Digital IC Case Style:LQFP; No. of Pins:48; Data Rate:12Mbps; No. of Ports:7; Operating Temperature ;RoHS Compliant: Yes |
| TUSB2077APTG4 | 功能描述:USB 接口集成電路 7-Port USB Hub RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
| TUSB2077APTR | 功能描述:USB 接口集成電路 7-Port Hub W/Opt Ser EEPROM Ifc RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
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