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M24C32BN1T Datasheet(PDF) 4 Page - STMicroelectronics |
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M24C32BN1T Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 19 page M24C64, M24C32 4/26 SUMMARY DESCRIPTION These I2C-compatible electrically erasable pro- grammable memory (EEPROM) devices are orga- nized as 8192 x 8 bits (M24C64) and 4096 x 8 bits (M24C32). Figure 2. Logic Diagram I2C uses a two-wire serial interface, comprising a bi-directional data line and a clock line. The devic- es carry a built-in 4-bit Device Type Identifier code (1010) in accordance with the I2C bus definition. The device behaves as a slave in the I2C protocol, with all memory operations synchronized by the serial clock. Read and Write operations are initiat- ed by a Start condition, generated by the bus mas- ter. The Start condition is followed by a Device Select Code and Read/Write bit (RW) (as de- scribed in Table 3.), terminated by an acknowl- edge bit. When writing data to the memory, the device in- serts an acknowledge bit during the 9th bit time, following the bus master’s 8-bit transmission. When data is read by the bus master, the bus master acknowledges the receipt of the data byte in the same way. Data transfers are terminated by a Stop condition after an Ack for Write, and after a NoAck for Read. Table 2. Signal Names Power On Reset: VCC Lock-Out Write Protect In order to prevent data corruption and inadvertent Write operations during Power-up, a Power On Reset (POR) circuit is included. At Power-up, the internal reset is held active until VCC has reached the Power On Reset (POR) threshold voltage, and all operations are disabled – the device will not re- spond to any command. In the same way, when VCC drops from the operating voltage, below the Power On Reset (POR) threshold voltage, all op- erations are disabled and the device will not re- spond to any command. A stable and valid VCC (as defined in Table 9. and Table 10.) must be applied before applying any logic signal. Figure 3. DIP, SO, TSSOP and UFDFPN Connections Note: See PACKAGE MECHANICAL section for package dimen- sions, and how to identify pin-1. AI01844B 3 E0-E2 SDA VCC M24C64 M24C32 WC SCL VSS E0, E1, E2 Chip Enable SDA Serial Data SCL Serial Clock WC Write Control VCC Supply Voltage VSS Ground SDA VSS SCL WC E1 E0 VCC E2 AI01845C M24C64 M24C32 1 2 3 4 8 7 6 5 |
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