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STOTG04ES 数据表(PDF) 19 Page - STMicroelectronics |
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STOTG04ES 数据表(HTML) 19 Page - STMicroelectronics |
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19 / 26 page ![]() STOTG04ES Block description 19/26 Table 21. Interrupt registers (*) (*) Bit order is the same for all four interrupt related registers. Meaning of each register is described in Table 17. 6.9 I2C Bus interface All of the STOTG04 transceiver registers are accessible through the I2C bus (see Figure 12). The device contains a slave controller which provides communication with an external master. The I2C interface consists of three pins: • SDA (Serial Data); • SCL (Serial Clock); • ADR_PSW (is the LSB of the device address). 6.10 Device address The USB-OTG transceiver has following 7-bit I2C device address: The adr bit represents current state of the ADR_PSW device pin. It means that the address can be either 2Ch or 2Dh according to the ADR_PSW pin. 6.11 Bus protocol Any device that sends data to the bus is defined as the transmitter. Any device that reads the data is the receiver. The device that controls data transfers is the bus master, while the transmitter or receiver is the slave device. The master initiates data transfers and provides the serial clock. The STOTG04 is always the slave device. Operation of the I2C bus is described by following figure 12. Name Bit R Description vbus_vld 0 0 A-device VBUS valid comparator sess_vld 1 0 Session valid comparator dp_hi 2 0 D+ pin is asserted high during SRP id_gnd 3 0 ID pin grounded dm_hi 4 0 D- pin is asserted high id_float 5 0 ID pin floating bdis_acon 6 0 Set when bdis_acon_en bit is set and transceiver asserts dp_pull-up after detecting B-device disconnect cr_int 7 0 Car-kit interrupt 01 01 10 adr |
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