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TCA6424 Fiches technique(PDF) 3 Page - Texas Instruments |
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TCA6424 Fiches technique(HTML) 3 Page - Texas Instruments |
3 / 29 page TCA6424 www.ti.com SCPS175A – NOVEMBER 2007 – REVISED NOVEMBER 2009 Table 1. TERMINAL FUNCTIONS (continued) TERMINAL DESCRIPTION PIN NO. NAME 22 P25 P-port input/output (push-pull design structure). At power on, P25 is configured as an input. 23 P26 P-port input/output (push-pull design structure). At power on, P26 is configured as an input. 24 P27 P-port input/output (push-pull design structure). At power on, P27 is configured as an input. 25 GND Ground 26 ADDR Address input. Connect directly to VCCP or ground. 27 VCCP Supply voltage of TCA6424 for P port 28 RESET Active-low reset input. Connect to VCCP through a pullup resistor, if no active connection is used. 29 SCL Serial clock bus. Connect to VCCI through a pullup resistor. 30 SDA Serial data bus. Connect to VCCI through a pullup resistor. Supply voltage of I2C bus. Connect directly to the VCC of the external I 2C master. Provides voltage-level 31 VCCI translation. 32 INT Interrupt output. Connect to VCCI through a pullup resistor. Voltage Translation Table 2 shows how to set up VCC levels for the necessary voltage translation between the I 2C bus and the TCA6424. Table 2. Voltage Translation VCCI (SDA AND SCL OF I 2C MASTER) VCCP (P PORT) (V) (V) 1.8 1.8 1.8 2.5 1.8 3.3 1.8 5 2.5 1.8 2.5 2.5 2.5 3.3 2.5 5 3.3 1.8 3.3 2.5 3.3 3.3 3.3 5 5 1.8 5 2.5 5 3.3 5 5 Copyright © 2007–2009, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Link(s): TCA6424 |
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