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SMP9410N 데이터시트(PDF) 8 Page - List of Unclassifed Manufacturers |
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SMP9410N 데이터시트(HTML) 8 Page - List of Unclassifed Manufacturers |
8 / 13 page 8 SMP9410 SUMMIT MICROELECTRONICS, Inc. Preliminary Information 2056 2.0 10/04/02 ACCESSING THE DACS Data transfers are initiated when a Master issues a Start condition, which is a high to low transition on SDA while SCL is high (see Figure 3). The Start is immediately followed by an eight bit transmission: bits 7 through 1 comprise the device type identifier and device bus address; bit 0 is the Read/Write bit indicating the action to follow. If the intended device receives the byte and recognizes its address it will return an Acknowledge during the 9th clock cycle. Some data transfers will be concluded with a Stop condition, which is a low to high transition on SDA while SCL is high. Note: a Stop condition must be performed for all nonvolatile Write operations. Timing for all I2C opera- tions are summarized in Figure 4 and Table 1. The default device type identifier for addressing DACs is 0101BIN. In order to accommodate more than eight devices on a single bus the device type identifier can be modified by the end user by writing to the configuration registers. (See Table 2). A0, A1 and A2 are the address inputs. When addressing the nonvolatile or configuration registers, theaddress inputs distinguish which one of eight possible devices sharing the common bus is being addressed. Setting them high or low will determine the device’s bus address that is contained within the serial bus data stream. Figure 3. START and STOP Timing Figure 4. I2C Data/Clock Timing 2056 Fig01 SCL SDA In START Condition STOP Condition tF tR tLOW tHIGH tHD:STA tSU:STA tBUF tDH tHD:DAT tSU:DAT tSU:STO SCL SDA In SDA Out tAA 2056 Fig02 Command Structure The command structure is illustrated in Table 2. Of special note is the ability to write individually to any of the four DACs, or to all of them. The first five commands are three bytes in length and can either be volatile or nonvolatile DAC writes. APPLICATIONS INFORMATION (CONTINUED) |
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