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LP5523 Datasheet(PDF) 17 Page - Texas Instruments |
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LP5523 Datasheet(HTML) 17 Page - Texas Instruments |
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17 / 56 page  ack from slave start MSB Chip Addr LSB SCL ack from slave w MSB Register Addr LSB rs r MSB Data LSB stop ack from slave nack from master repeated start data from slave SDA start id =32h w ack address = 3Fh ack rs r ack address 3Fh data nack stop MSB Chip Address LSB id = 32h start MSB Chip Addr LSB w ack MSB Register Addr LSB ack MSB Data LSB ack stop ack from slave ack from slave ack from slave SCL SDA start id = 32h w ack addr = 40h ack ack address 40h data stop ADR6 bit7 ADR5 bit6 ADR4 bit5 ADR3 bit4 ADR2 bit3 ADR1 bit2 ADR0 bit1 R/W bit0 MSB LSB 0 0 0 1 1 0 1 I 2 C Slave Address (chip address) LP5523 www.ti.com SNVS550D – SEPTEMBER 2009 – REVISED MAY 2013 Figure 21. LP5523 Chip Address This data pattern writes temperature information to the TEMPERATURE WRITE register (40h). Figure 22. Write cycle (w = write; SDA = "0"), id = chip address = 32h for LP5523 This data pattern reads temperature information from the TEMPERATURE READ register (3Fh). When a READ function is to be accomplished, a WRITE function must precede the READ function, as shown above. Figure 23. Read cycle (r = read; SDA = "1"), id = chip address = 32h for LP5523 Control Register Write Cycle • Master device generates start condition. • Master device sends slave address (7 bits) and the data direction bit (r/w = 0). • Slave device sends acknowledge signal if the slave address is correct • Master sends control register address (8 bits). • Slave sends acknowledge signal. • Master sends data byte to be written to the addressed register. • Slave sends acknowledge signal. • If master sends further data bytes, the slave’s control register address will be incremented by one after acknowledge signal. In order to reduce program load time, the LP5523 supports address auto incrementation. Register address is incremented after each 8 data bits. For example, the whole program memory page can be written in one serial bus write sequence. Note: serial bus address auto increment is not supported for register addresses from 16 to 1E. • Write cycle ends when the master creates stop condition. Copyright © 2009–2013, Texas Instruments Incorporated Submit Documentation Feedback 17 Product Folder Links: LP5523 |
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