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SC23M28 Datasheet(PDF) 3 Page - Silan Microelectronics Joint-stock |
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SC23M28 Datasheet(HTML) 3 Page - Silan Microelectronics Joint-stock |
3 / 10 page SC23M28 HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:1.0 2006.07.21 Http: www.silan.com.cn Page 3 of 10 PIN CONFIGURATION 1 2 3 4 8 7 6 5 VCC RST CLK NC NC NC I/O GND (Contact of the card) PIN DESCRIPTIONS Pin No. Symbol I/O Description 1 VCC -- Power supply voltage is 5V 2 RST I Reset signal 3 CLK I Clock signal 4 NC -- No connect 5 GND -- Ground 6 NC -- No connect 7 I/O I/O Data bus(open-drain output) 8 NC -- No connect FUNCTION DESCRIPTIONS SC23M28 provides 1024×8 bits EEPROM memory units with write-protect for each bit. Except PSC (Programmable Security Code) memory unit, all units are readable. The unit can be erased and written before the write-protect is active, or else the unit is only readable. The bit with write-protection can be programmed only once, and cannot be erased. The chip has one 8-bit error register which provides 8 times continuous PSC authentication, after 8 times the chip cannot be erased and written. 1. Reset and reset acknowledge The chip enters the power on reset state when it is power on, and this state will end by the reset signal. The reset signal begins when RST changed from “0”to “1”, and end when CLK changed from “0”to“1”. The reset signal can stop any active instruction. Read operation must be carried out first after power on reset, then the other operations. The reset acknowledge complies to ISO7816-3 synchronous propagation. The address counter is set to “0” automatically and will send the first data to the I/O port. As the clock signal, the address data can be read serially. The details refer to the figure 1. |
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