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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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BME680 датащи(PDF) 39 Page - Bosch Sensortec GmbH |
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BME680 датащи(HTML) 39 Page - Bosch Sensortec GmbH |
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39 / 53 page  Bosch Sensortec | BME680 Datasheet 39 | 53 Modifications reserved |Data subject not change without notice | Printed in Germany Document number: BST-BME680-DS001-09 Revision_1.9_022024 The I²C interface uses the following pins: • SCK: serial clock (SCL) • SDI: data (SDA) • SDO: Slave address LSB (GND = ‘0’, VDDIO = ‘1’) CSB must be connected to VDDIO to select I²C interface. SDI is bi-directional with open drain to GND: it must be externally connected to VDDIO via a pull up resistor. Refer to Chapter 7 for connection instructions. The following abbreviations will be used in the I²C protocol figures: • S Start • P Stop • ACKS Acknowledge by slave • ACKM Acknowledge by master • NACKM Not acknowledge by master 6.2.1 I²C write Writing is done by sending the slave address in write mode (RW = ‘0’), resulting in slave address 111011X0 (‘X’ is determined by state of SDO pin. Then the master sends pairs of register addresses and register data. The transaction is ended by a stop condition. This is depicted in Picture 4. Start RW ACKS ACKS ACKS 1 1 1 0 1 1 X 0 1 0 1 0 0 0 0 0 bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 … ACKS ACKS Stop … 1 0 1 0 0 0 0 1 bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 Register data - address A0h Register address (A0h) Register address (A1h) S Slave Address Control byte Data byte Control byte Data byte P Register data - address A1h Picture 4: I²C multiple byte write (not auto-incremented) 6.2.2 I²C read To be able to read registers, first the register address must be sent in write mode (slave address 111011X0). Then either a stop or a repeated start condition must be generated. After this the slave is addressed in read mode (RW = ‘1’) at address 111011X1, after which the slave sends out data from auto-incremented register addresses until a NOACKM and stop condition occurs. This is depicted in Picture 5, where register 0xF6 and 0xF7 are read. Start RW ACKS ACKS 1 1 1 0 1 1 X 0 1 1 1 1 0 1 1 0 Start RW ACKS ACKM NOACKM Stop 1 1 1 0 1 1 X 1 bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 Control byte Data byte Data byte Register address (F6h) S Slave Address P S Slave Address Register data - address F7h Register data - address F6h Picture 5: I²C multiple byte read |
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