參數(shù)資料
型號(hào)： ISP1561BM,557
廠商： ST-ERICSSON
元件分類： 總線控制器
英文描述： UNIVERSAL SERIAL BUS CONTROLLER, PQFP128
封裝： 14 X 14 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-420-1, LQFP-128
文件頁(yè)數(shù)： 28/103頁(yè)
文件大小： 457K
代理商： ISP1561BM,557
ISP1561_2
NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 02 — 5 March 2007
30 of 103
NXP Semiconductors
ISP1561
HS USB PCI Host Controller
9.
I2C-bus interface
A simple I2C-bus interface is provided in the ISP1561 to read customized vendor ID,
product ID and some other conguration bits from an external EEPROM.
The I2C-bus interface is for bidirectional communication between ICs using two serial bus
wires: SDA (data) and SCL (clock). Both lines are driven by open-drain circuits and must
be connected to the positive supply voltage through pull-up resistors.
9.1 Protocol
The I2C-bus protocol denes the following conditions:
Bus free: both SDA and SCL are HIGH
START: a HIGH-to-LOW transition on SDA, while SCL is HIGH
STOP: a LOW-to-HIGH transition on SDA, while SCL is HIGH
Data valid: after a START condition, data on SDA is stable during the HIGH period of
SCL; data on SDA may only change while SCL is LOW
Each device on the I2C-bus has a unique slave address, which the master uses to select a
device for access.
The master starts a data transfer using a START condition and ends it by generating a
STOP condition. Transfers can only be initiated when the bus is free. The receiver must
acknowledge each byte by means of a LOW level on SDA during the ninth clock pulse on
SCL.
For detailed information, refer to Ref. 7 “The I2C-bus Specication”.
9.2 Hardware connections
The ISP1561 can be connected to an external EEPROM through the I2C-bus interface.
The hardware connections are shown in Figure 3.
The slave address that the ISP1561 uses to access the EEPROM is 101 0000b. Page
mode addressing is not supported. Therefore, pins A0, A1 and A2 of the EEPROM must
be connected to ground (logic 0).
Fig 3.
EEPROM connection diagram
004aaa163
SDA
SCL
A1
A2
A0
SDA
SCL
DVAUX
RP
DVAUX
ISP1561
USB HOST
24C01
EEPROM
or
equivalent
I2C-bus
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