Datenblatt-Suchmaschine für elektronische Bauteile |
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ST25W16B3TR Datenblatt(PDF) 4 Page - STMicroelectronics |
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ST25W16B3TR Datenblatt(HTML) 4 Page - STMicroelectronics |
4 / 17 page AI01100 VCC CBUS SDA RL MASTER RL SCL CBUS 100 200 300 400 0 4 8 12 16 20 CBUS (pF) VCC = 5V Figure 3. Maximum RL Value versus Bus Capacitance (CBUS) for an I2C Bus SIGNALS DESCRIPTION Serial Clock (SCL). The SCL input signal is used to synchronise all data in and out of the memory. A resistor can be connected from the SCL line to VCC to act as a pull up (see Figure 3). Serial Data (SDA). The SDA signal is bi-directional and is used to transfer data in or out of the memory. It is an open drain output that may be wire-OR’ed with other open drain or open collector signals on the bus. A resistor must be connected from the SDA bus line to VCC to act as pull up (see Figure 3). Protected Block Select (PB0, PB1). PB0 and PB1 input signals select the block in the upper part of the memory where write protection starts. These inputs have a CMOS compatible input level. Protect Enable (PRE). The PRE input signal, in addition to the status of the Block Address Pointer bit (b2, location 7FFh as in Figure 7), sets the PRE write protection active. Mode (MODE). The MODE input is available on pin 7 (see also WC feature) and may be driven dynami- cally. It must be at VIL or VIH for the Byte Write mode, VIH for Multibyte Write mode or VIL for Page Write mode. When unconnected, the MODE input is internally read as VIH (Multibyte Write mode). Write Control (WC). An hardware Write Control feature is offered only for ST24W16 and ST25W16 versions on pin 7. This feature is usefull to protect the contents of the memory from any erroneous erase/write cycle. The Write Control signal is used to enable (WC at VIH) or disable (WC at VIL) the internal write protection. When unconnected, the WC input is internally read as VIL. The devices with this Write Control feature no longer supports the Multibyte Write mode of operation, however all other write modes are fully supported. Refer to the AN404 Application Note for more de- tailed information about Write Control feature. 4/17 ST24/25C16, ST24/25W16 |
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