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24AA01HT Datasheet(PDF) 5 Page - Microchip Technology |
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24AA01HT Datasheet(HTML) 5 Page - Microchip Technology |
5 / 30 page © 2008 Microchip Technology Inc. DS22104A-page 5 24AA01H/24LC01BH 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 The A0, A1 and A2 pins are not used by the 24XX01H. They may be left floating or tied to either VSS or VCC. 2.2 Serial Address/Data Input/Output (SDA) The SDA input is a bidirectional pin used to transfer addresses and data into and out of the device. Since it is an open-drain terminal, the SDA bus requires a pull-up resistor to VCC (typical 10 k Ω for 100 kHz, 2k Ω 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, normal memory operation is enabled (read/write the entire memory 00-7F). If tied to VCC, write operations are inhibited. Half of the memory will be write-protected (40h-7Fh). Read operations are not affected. Name PDIP SOIC TSSOP TDFN MSOP SOT23 SC-70 Description A0 1 1 1 1 1 — — Not Connected A1 2 2 2 2 2 — — Not Connected A2 3 3 3 3 3 — — Not Connected VSS 44 4 4 4 2 2 Ground SDA 5 5 5 5 5 3 3 Serial Address/Data I/O SCL6 6 6 6 6 11 Serial Clock WP 7 7 7 7 7 5 5 Write-Protect Input VCC 8 8 8 8 8 4 4 +1.7V to 5.5V Power Supply |
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