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AM24LC21IS bảng dữ liệu(PDF) 11 Page - List of Unclassifed Manufacturers |
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AM24LC21IS bảng dữ liệu(HTML) 11 Page - List of Unclassifed Manufacturers |
11 / 13 page AM24LC21 Dual Mode, 1K-bits (128 x 8) 2-Wire Serial EEPROM (Preliminary) Anachip Corp. www.anachip.com.tw Rev 0.0 Aug 10, 2002 11/13 S T O P N O A C K S S T A R T Control Byte Word address Control Byte Bus activity SDA Line Bus activity Master A C K A C K A C K Data(n) P S S T A R T Figure 7-2. Random read S T O P N O A C K Data(n) Data(n+1) Data(n+2) Bus activity SDA Line Bus activity Master A C K A C K A C K Data(n+X) P A C K Contro Byte Figure 7-3. Sequential read Pin Descriptions (Continued) SDA This pin is used to transfer addresses and data into and out of the device, when the device is in the bi-directional mode. In the transmit-only mode, which only allows data to be read from the device, data is also transferred on the SDA pin. This pin is an open drain terminal, therefore the SDA bus requires a pull-up resistor to VCC (typical 10k for 100 Khz, 1k for 400 Khz). For normal data transfer in the bi-directional mode, SDA is allowed to change only during SCL low. Changes during SCL high are reserved for indicating the START and STOP conditions. SCL This pin is the clock input for the bi-directional mode, and is used to synchronize data transfer to and from the device. It is also used as the signaling input to switch the device from the transmit only mode to the bi-directional mode. It must remain high for the chip to continue operation in the transmit only mode. VCLK This pin is the clock input for the transmit only mode. In the transmit only mode, each bit is clocked out on the rising edge of this signal. In the bi-directional mode, a high logic level is required on this pin to enable write capability. WP When using the AM24LC21 in the bi-directional Mode, the VCLK pin operates as the write protect control pin. Setting VCLK high allows normal write operations, while setting VCLK low prevents writing to any location in the array. Connecting the VCLK pin to VSS would allow the AM24LC21 to operate as a serial ROM, although this configuration would prevent using the device in the transmit-only mode. If WP is connected to GND, PROGRAM operation onto the whole memory will not be executed. READ operation are possible. If WP is connected to Vcc, normal memory operation is enabled, READ/ WRITE over the entire memory is possible. |
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