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DS28CN01U-A00+ Datasheet(PDF) 4 Page - Maxim Integrated Products |
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DS28CN01U-A00+ Datasheet(HTML) 4 Page - Maxim Integrated Products |
4 / 10 page Note 12: The DS28CN01 does not obstruct the SDA and SCL lines if Vcc is switched off. Note 13: The minimum SCL clock frequency is limited by the bus timeout feature. If the CM bit is 1 and SCL stays at the same logic level or SDA stays low for this interval, the DS28CN01 behaves as though it has sensed a STOP condition. Note 14: System requirement. Note 15: The DS28CN01 provides a hold time of at least 300ns for the SDA signal (referred to the VIH(MIN) of the SCL signal) to bridge the undefined region of the falling edge of SCL. Note 16: The master can provide a hold time of 0ns minimum when writing to the device. This 0ns minimum is guaranteed by design, characterization, and/or simulation only, and not production tested. Note 17: A fast-mode I2C bus device can be used in a standard-mode I2C bus system, but the requirement tSU:DAT ≥ 250ns must then be met. This is automatically the case if the device does not stretch the low period of the SCL signal. If such a device does stretch the low period of the SCL signal, it must output the next data bit to the SDA line tRMAX + tSU:DAT = 1000 + 250 = 1250ns (according to the standard-mode I2C bus specification) before the SCL line is released. 1Kb I2C/SMBus EEPROM with SHA-1 Engine 4 _______________________________________________________________________________________ ABRIDGED DATA SHEET Pin Description PIN NAME FUNCTION 1 AD0 Device Address Input Pin to Select the Slave Address. Sets slave address bits A[1:0] and must be connected to either GND, SDA, SCL, or VCC. 2 AD1 Device Address Input Pin to Select the Slave Address. Sets slave address bits A[3:2] and must be connected to either GND, SDA, SCL, or VCC. 3, 7 N.C. No Connection 4 GND Ground Supply 5 SDA I2C/SMBus Bidirectional Serial Data Line. This pin must be connected to VCC through a pullup resistor. 6 SCL I2C/SMBus Serial Clock Input. This pin must be connected to VCC through a pullup resistor. 8 VCC Power-Supply Input Detailed Description The DS28CN01 features a serial I2C/SMBus interface, 1Kb of SHA-1 secure EEPROM, a register page, and a unique registration number, as shown in the Block Diagram. The device communicates with a host proces- sor through its I2C interface in standard mode or in fast mode. The user can switch the interface from I2C bus mode to SMBus mode. Two 4-level address pins allow 16 DS28CN01s to reside on the same bus segment. Device Operation Read and write access to the DS28CN01 is controlled through the I2C/SMBus serial interface. Since the DS28CN01 has memory areas and registers of different characteristics, there are several special cases to con- sider. See the Read and Write section in the full data sheet for details. Serial Communication Interface The serial interface uses a data line (SDA) plus a clock signal (SCL) for communication. Both SDA and SCL are bidirectional lines, connected to a positive supply volt- age through a pullup resistor. When there is no commu- nication, both lines are high. The output stages of devices connected to the bus must have an open-drain or open-collector output to perform the wired-AND function. Data can be transferred at rates of up to 100kbps in the standard mode, and up to 400kbps in the fast mode. The DS28CN01 works in both modes. A device that sends data on the bus is defined as a transmitter and a device receiving data is a receiver. The device that controls the communication is called a master. The devices that are controlled by the master are slaves. The DS28CN01 is a slave device. ELECTRICAL CHARACTERISTICS (continued) (TA = -40°C to +85°C.) (Note 1) |
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