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ADM1191-2ARMZ-R7 Datenblatt(PDF) 11 Page - Analog Devices |
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ADM1191-2ARMZ-R7 Datenblatt(HTML) 11 Page - Analog Devices |
11 / 16 page ADM1191 Rev. B | Page 11 of 16 WRITE AND READ OPERATIONS The I2C specification defines several protocols for different types of read and write operations. The operations used in the ADM1191 are discussed in this section. Table 6 shows the abbreviations used in the command diagrams (see Figure 19 to Figure 24). Table 6. I2C Abbreviations Abbreviation Condition S Start P Stop R Read W Write A Acknowledge N No acknowledge QUICK COMMAND The quick command operation allows the master to check if the slave is present on the bus, as follows: 1. The master device asserts a start condition on SDA. 2. The master sends the 7-bit slave address, followed by the write bit (low). 3. The addressed slave device asserts an acknowledge on SDA. 4. The master asserts a stop condition on SDA to end the transaction. S SLAVE ADDRESS WA 12 3 P 4 Figure 19. Quick Command WRITE COMMAND BYTE In the write command byte operation, the master device sends a command byte to the slave device, as follows: 1. The master device asserts a start condition on SDA. 2. The master sends the 7-bit slave address, followed by the write bit (low). 3. The addressed slave device asserts an acknowledge on SDA. 4. The master sends the command byte. The command byte is identified by an MSB = 0. An MSB = 1 indicates an extended register write (see the Write Extended Command Byte section). 5. The slave asserts an acknowledge on SDA. 6. The master asserts a stop condition on SDA to end the transaction. S SLAVE ADDRESS WA COMMAND BYTE AP 12 3 4 5 6 Figure 20. Write Command Byte The seven LSBs of the command byte are used to configure and control the ADM1191. Table 7 provides details of the function of each bit. Table 7. Command Byte Operations Bit Default Name Function C0 0 V_CONT LSB, set to convert voltage continuously. If readback is attempted before the first conversion is complete, the ADM1191 asserts an acknowledge and returns all 0s in the returned data. C1 0 V_ONCE Set to convert voltage once. Self-clears. I2C asserts a no acknowledge on attempted reads until the ADC conversion is complete. C2 0 I_CONT Set to convert current continuously. If readback is attempted before the first conversion is complete, the ADM1191 asserts an acknowledge and returns all 0s in the returned data. C3 0 I_ONCE Set to convert current once. Self-clears. I2C asserts a no acknowledge on attempted reads until the ADC conversion is complete. C4 0 VRANGE Selects different internal attenuation resistor networks for voltage readback. A 0 in C4 selects a 14:1 voltage divider. A 1 in C4 selects a 7:2 voltage divider. With an ADC full scale of 1.902 V, the voltage at the VCC pin for an ADC full-scale result is 26.52 V for VRANGE = 0 and 6.65 V for VRANGE = 1. C5 0 N/A Unused. C6 0 STATUS_RD Status Read. When this bit is set, the data byte read back from the ADM1191 is the status byte. It contains the status of the device alerts. See Table 15 for full details of the status byte. |
Ähnliche Teilenummer - ADM1191-2ARMZ-R7 |
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Ähnliche Beschreibung - ADM1191-2ARMZ-R7 |
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