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SMP9410 データシート(PDF) 9 Page - List of Unclassifed Manufacturers |
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SMP9410 データシート(HTML) 9 Page - List of Unclassifed Manufacturers |
9 / 13 page 9 SMP9410 SUMMIT MICROELECTRONICS, Inc. Preliminary Information 2056 2.0 10/04/02 C 2 C 4 A C K A C K S T O P Master SDA Slave 1 0 0 1 R/ W A 2 A 1 A 0 Optional 2056 Fig05 1 C 7 C 6 C 5 C 3 C 1 C 0 Configuration Data Byte A C K Master SDA Slave 0 1 0 1 R/ W 1 A 2 A 1 A 0 2056 Fig04 DAC S T O P D 7 D 6 D 5 D 4 D 3 D 2 D 1 D 0 A C K x x x x 1 0 0 1 Data from Master Data to Master N A C K D 9 D 8 A C K x x x x x x A C K D 9 D 8 A C K A C K S T O P Master SDA Slave 0 1 0 1 R/ W 0 D 7 D 6 D 5 D 4 D 3 D 2 D 1 D 0 x A 2 A 1 A 0 1 0 0 1 Nonvolatile Write Only x 2056 Fig03 Command Data Byte ACK and NACK A device that is receiving data will respond with an Acknowl- edge by pulling the SDA line low (ACK) after each byte is transmitted. The transmitting device will recognize this and continue to transmit. When the Master has received the data it expects it will hold the SDA line high (NACK) and the transmitting device will end transmission. Sequence The sequence is to issue a Start, followed by the device type and bus address with the Read/Write bit set to zero. The device will respond with an Acknowledge and the Master will then issue the command and follow-on data. In Figure 5 the Write is to DAC1 where the command = 1001BIN; D9 and D8 are the MSBs of the DAC value being written. The device will then respond with an Acknowledge followed by the Master writing the last eight bits. If no Stop is generated after the device Acknowledge the Write is only to the register. If the device Acknowledge is followed by a Stop the data is written to both the DAC register and to the nonvolatile register. Reading the Device Reading the DACs requires setting the R/W bit to one. Then the host supplies clocks and the device will output data as shown in Figure 6. Configuration Register The SMP9410 can be configured by the end user or by Summit prior to shipment (see Programming Information). Reading the configuration register can also be performed if it has not already been locked. See Figure 7. There is one configuration register and it is accessed through the serial interface using 1001BIN as the device type address, conse- quently the DAC address should never be set to 1001BIN. The register is shown in Table 3. Figure 5. DAC1 Write Operation (see Table 2) Figure 6. Read DACs APPLICATIONS INFORMATION (CONTINUED) Figure 7. Configuration Register (see Table 3) |
同様の部品番号 - SMP9410 |
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同様の説明 - SMP9410 |
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