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24AA32A-EOT Datasheet(PDF) 5 Page - Microchip Technology |
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24AA32A-EOT Datasheet(HTML) 5 Page - Microchip Technology |
5 / 36 page 2009 Microchip Technology Inc. DS21713K-page 5 24AA32A/24LC32A 2.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 2-1. TABLE 2-1: PIN FUNCTION TABLE 2.1 A0, A1, A2 Chip Address Inputs The A0, A1 and A2 inputs are used by the 24XX32A for multiple device operation. The levels on these inputs are compared with the corresponding bits in the slave address. The chip is selected if the comparison is true. Up to eight devices may be connected to the same bus by using different Chip Select bit combinations. These inputs must be connected to either VCC or VSS. In most applications, the chip address inputs A0, A1 and A2 are hard-wired to logic ‘0’ or logic ‘1’. For applications in which these pins are controlled by a microcontroller or other programmable device, the chip address pins must be driven to logic ‘0’ or logic ‘1’ before normal device operation can proceed. Address pins are not available in the SOT-23 and chip scale packages. 2.2 Serial Data (SDA) SDA is a bidirectional pin used to transfer addresses and data into and out of the device. It is an open-drain terminal, therefore, the SDA bus requires a pull-up resistor to VCC (typical 10 k for 100 kHz, 2 k for 400 kHz) For normal data transfer, SDA is allowed to change only during SCL low. Changes during SCL high are reserved for indicating Start and Stop conditions. 2.3 Serial Clock (SCL) The SCL input is used to synchronize the data transfer to and from the device. 2.4 Write-Protect (WP) This pin must be connected to either VSS or VCC. If tied to VSS, write operations are enabled. If tied to VCC, write operations are inhibited but read operations are not affected. Name PDIP SOIC SOIJ TSSOP DFN TDFN MSOP SOT-23 CS Description A0 1 1 1 1 1 1 1 — — Chip Address Input A1 2 2 2 2 2 2 2 — — Chip Address Input A2 3 3 3 3 3 3 3 — — Chip Address Input VSS 4 4 4 4 4 4 4 2 2 Ground SDA 5 5 5 5 5 5 5 3 5 Serial Address/Data I/O SCL 6 6 6 6 6 6 6 1 4 Serial Clock WP 7 7 7 7 7 7 7 5 3 Write-Protect Input VCC 8 8 8 8 8 8 8 4 1 +1.7V to 5.5V Power Supply |
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