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TS13103 Scheda tecnica(PDF) 8 Page - Semtech Corporation |
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TS13103 Scheda tecnica(HTML) 8 Page - Semtech Corporation |
8 / 16 page TS13103 Final Datasheet Rev 2.1 28 July 2016 8 of 16 Semtech Proprietary & Confidential Poll Command A Poll State command may be sent to the device when no change of operation is desired, but the state of the Status Values is needed by the microcontroller. In non-latched operation, this command will also serve to recharge the Watchdog Timer. See the Latching Configuration section for details. Status Values The (S2 S1 S0) field received using the DATA pin provides the status of the switch before the command has been executed. Each of the S2, S1 or the S0 bits is generated by the switch in the following way: • For zero: the DATA pin is pulsed for first 2 clock pulses matching the protocol (the pulses corresponding to the Zero signal). • For one: the DATA pin duplicates the signal available at the CLK pin (the pulses corresponding to the One signal). The following status values are defined: S2 S1 S0 Status 0 0 0 Reserved 0 0 1 OFF 0 1 0 Reserved 0 1 1 Reserved 1 0 0 ON, Dithering disabled 1 0 1 ON, Dithering enabled 1 1 0 Reserved 1 1 1 Over Current Table 3: Valid Status Values DATA Bus Contention Note that if more than one device is wired to the same address, the devices will all report their status values at the same time. Since the status of each device may be different (for example, an over-current event was recorded on one device and it has disabled itself), the status values (S2 S1 S0) can possibly be different, leading to the DATA pins of two (or more) devices to transmit different data. This will lead to high supply current draw which may damage the device, reset the system (due to voltage drop), or other undesirable events. If sharing addresses is desired, the DATA pins of those devices must have a separate CDATA capacitor wired to a dedicated GPIO on the microcontroller. |
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