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AAT4296 Datasheet(PDF) 10 Page - Advanced Analogic Technologies |
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AAT4296 Datasheet(HTML) 10 Page - Advanced Analogic Technologies |
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10 / 18 page  These devices may also be used for load switching applications, as well as I/O expansion. Since the VCC is gated to each output through a slew rate lim- ited low on-resistance switch, they are ideal for controlling applications circuits with light load cur- rent requirements. Such applications could include simple LED function indicator lamps, RGB LED fashion lighting, audio and RF circuits, or any other system with a power requirement that does not exceed the thermal dissipation limits of the load switch and device package. Each device push/pull output may be represented by the following circuit and simplified equivalent model (Figures 1 and 2): Figure 1: Push/Pull Output Circuit. Figure 2: Simplified Equivalent Model. The state of each output is controlled via the EN/SET pin using AnalogicTech's S2Cwire inter- face. To enable a respective switch, a series of clocked pulses should be applied to the EN/SET pin. The number of pulses clocked will determine the switch configuration based on the truth table shown in Table 1. At the end of the serial pulse data set, the EN/SET set pin should be held high to then latch the clocked data and enable the desired switch configuration. When the device is enabled with the EN/SET held to a logic high state, the device quiescent current consumption will typ- ically increase to 3µA and normal ambient room temperatures. If output sequencing of the switches is not necessary, all of the outputs will be switched on simultaneously on the first rising edge of the EN/SET pin by simply pulling the EN/SET to a logic high level. The default switch position for one clock pulse is all switches "on." However, if output sequencing is desired, a series of pulses on the EN/SET pin will set the outputs to the desired state (refer to Table 1 for output settings). The AAT4296/98 offers two different options when the switches are in the off state. For applications with an active pull down or auto-discharge requirement, the internal N-channel switch will connect the output node to ground with a series resistance of 2 Ω. S2Cwire Serial Interface The ON/OFF state of the output is controlled by the EN/SET serial data input. An internal control counter is clocked on the rising edge of the EN/SET pin and is decoded into the 32/64 possible states (see Table 1). 3 Ω 2 Ω V CC Control OUT OUT V CC Control AAT4296/98 Five/Six Channel Push/Pull I/O Expander 10 4296.2006.12.1.3 |
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