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LSM330D Scheda tecnica(PDF) 34 Page - STMicroelectronics |
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LSM330D Scheda tecnica(HTML) 34 Page - STMicroelectronics |
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34 / 66 page  Digital interfaces LSM330D 34/66 Doc ID 022562 Rev 2 Data transfer only continues when the receiver is ready for another byte and releases the data line. If a slave receiver does not acknowledge the slave address (i.e. it is not able to receive because it is performing some real-time function) the data line must be left HIGH by the slave. The master can then abort the transfer. A LOW to HIGH transition on the SDA line while the SCL line is HIGH is defined as a STOP condition. Each data transfer must be terminated by the generation of a STOP (SP) condition. In order to read multiple bytes, it is necessary to assert the most significant bit of the sub- address field. In other words, SUB(7) must be equal to 1 while SUB(6-0) represents the address of first register to be read. In the communication format presented, MAK is Master Acknowledge and NMAK is No Master Acknowledge. Default address: The SDO/SA0 pin (SDO_A / SDO_G) can be used to modify the least significant bit of the device address. If the SA0 pad is connected to voltage supply, the LSb is ‘1’ (ex. address 0011001b), otherwise if the SA0 pad is connected to ground, the LSb value is ‘0’ (ex address 0011000b). The slave address is completed with a Read/Write bit. If the bit was ‘1’ (Read), a repeated START (SR) condition will have to be issued after the two sub-address bytes; if the bit is ‘0’ (Write) the master will transmit to the slave with direction unchanged. Table 16 and 17 explain how the SAD+Read/Write bit pattern is composed, listing all the possible configurations. Linear acceleration address: the default (factory) 7-bit slave address is 001100xb. Angular rate sensor: the default (factory) 7-bit slave address is 110101xb. Table 16. Linear acceleration SAD+Read/Write patterns Command SAD[6:1] SAD[0] = SDO_A pin R/W SAD+R/W Read 001100 0 1 00110001 (31h) Write 001100 0 0 00110000 (30h) Read 001100 1 1 00110011 (33h) Write 001100 1 0 00110010 (32h) Table 17. Angular rate SAD+Read/Write patterns Command SAD[6:1] SAD[0] = SDO_G pin R/W SAD+R/W Read 110101 0 1 11010101 (D5h) Write 110101 0 0 11010100 (D4h) Read 110101 1 1 11010111 (D7h) Write 110101 1 0 11010110 (D6h) |
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